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Rotors (Helicopters)

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• Theory of noise generation from moving bodies with an application to helicopter rotors / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by F. Farassat and Langley Research Center (page images at HathiTrust)
• Effect on helicopter performance of modifications in profile-drag characteristics of rotor-blade airfoil sections / (Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1944), by F. B. Gustafson, United States. National Advisory Committee for Aeronautics, and Langley Aeronautical Laboratory (page images at HathiTrust)
• Comparison of three methods for calculation of helicopter rotor blade loading and stresses due to stall / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Wayne Johnson, U.S. Army Air Mobility Research and Development Laboratory, and Ames Research Center (page images at HathiTrust)
• Experimental study of rotor unsteady airloads due to blade-vortex interaction / (Washington, D.C. : National Aeronautics and Space Administration, 1971), by Raghuveera Padakannaya, United States National Aeronautics and Space Administration, Langley Research Center, and Pennsylvania State University (page images at HathiTrust)
• Experimental investigation of model variable-geometry and ogee tip rotors / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service [distributor], 1974), by Anton J. Landgrebe, E. Dean Bellinger, Langley Research Center, and United Aircraft Corporation. Research Laboratories (page images at HathiTrust)
• A full potential flow analysis with realistic wake influence for helicopter rotor airload prediction / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by T. Alan Egolf and S. Patrick Sparks (page images at HathiTrust)
• Main rotor free wake geometry effects on blade air loads and response for helicopters in steady maneuvers / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1972), by S. Gene Sadler, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• Flight measurements of the effects of blade out of track on the vibration levels on a tandem rotor helicopter / (Washington : National Aeronautics and Space Administration, [1960]), by United States National Aeronautics and Space Administration and Langley Research Center (page images at HathiTrust)
• Rotor induced-inflow-ratio measurements and CAMRAD calculations / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Danny R. Hoad and United States. Army Aerostructures Directorate (page images at HathiTrust)
• Simplified procedures for estimating flapwise bending moments on helicopter rotor blades : (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, VA : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1969), by Anton J. Landgrebe, Langley Research Center, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Simplified procedures for estimating flapwise bending moments on helicopter rotor blades : (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, VA : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1969), by Anton J. Landgrebe, Langley Research Center, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• The effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability : Part 1. Analysis and application / (Washington : National Aeronautics and Space Administration, 1971), by Vincent James Piarulli, United States National Aeronautics and Space Administration, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• Nonlinear transient analysis of multi-mass flexible rotors : theory and applications / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by R. Gordon Kirk, Edgar J. Gunter, Lewis Research Center, and University of Virginia (page images at HathiTrust)
• Blade-mounted trailing edge flap control for BVI noise reduction / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992), by A. A. Hassan, Langley Research Center, and McDonnell Douglas Helicopter Company (page images at HathiTrust)
• Performance of an optimized rotor blade at off-design flight conditions / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Aditi Chattopadhyay, Langley Research Center, and Inc Analytical Services & Materials (page images at HathiTrust)
• A momentum analysis of helicopters and autogyros in inclined descent, with comments on operational restrictions / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Harry H. Heyson and Langley Research Center (page images at HathiTrust)
• Flapping response characteristics of hingeless rotor blades by a generalized harmonic balance method / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by D. A. Peters, Robert A. Ormiston, U.S. Army Air Mobility Research and Development Laboratory, and Ames Research Center (page images at HathiTrust)
• Further analysis of broadband noise measurements for a rotating blade operating with and without its shed wake blown downstream / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by James Scheiman and Langley Research Center (page images at HathiTrust)
• Helicopter rotor rotational noise predictions based on measured high-frequency blade loads / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Robert N. Hosier, Ramani Ramakrishnan, and Langley Research Center (page images at HathiTrust)
• Aerodynamic characteristics of two rotorcraft airfoils designed for application to the inboard region of a main rotor blade / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Kevin W. Noonan and United States. Army Aerostructures Directorate (page images at HathiTrust)
• Tables for estimating rotary wing performance at high forward speeds / ([Washington] : National Aeronautics and Space Administration, [1964]), by Watson H. Tanner, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Application of a parameter identification technique to a hingeless helicopter rotor / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Gerd Kanning, James C. Biggers, and Ames Research Center (page images at HathiTrust)
• The effects of structural flap-lag and pitch-lag coupling on soft inplane hingeless rotor stability in hover / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by William G. Bousman, United States. Army Aviation Research and Technology Activity, and Ames Research Center (page images at HathiTrust)
• Wake geometry effects on rotor blade-vortex interaction noise directivity / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by R. M. Martin and Langley Research Center (page images at HathiTrust)
• Free wake analysis of hover performance using a new influence coefficent method / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Todd R. Quackenbush, Ames Research Center, and Inc Continuum Dynamics (page images at HathiTrust)
• The calculation of three-dimensional turbulent boundary layers on helicopter rotors / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1971), by J. G. Hicks, J. F. Nash, Lockheed-Georgia Company, United States National Aeronautics and Space Administration, and Ames Research Center (page images at HathiTrust)
• Source mechanisms for rotor noise radiation / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by M. V. Lowson, C. E. Whitfield, A. R. Whatmore, Langley Research Center, and Loughborough University of Technology (page images at HathiTrust)
• Analysis of helicopter maneuver-loads and rotor-loads flight-test data / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by Edward A. Beno, Langley Research Center, and United Aircraft Corporation. Sikorsky Aircraft Division (page images at HathiTrust)
• An experimental investigation of vortex stability, tip shapes, compressibility, and noise for hovering model rotors / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by James L. Tangler, Stan J. Miley, Robert M. Wohlfeld, Langley Research Center, and Bell Helicopter Company (page images at HathiTrust)
• An enhanced integrated aerodynamic load/dynamic optimization procedure for helicopter rotor blades / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Aditi Chattopadhyay, Y. Danny Chiu, Langley Research Center, Lockheed Engineering & Sciences Company, and Inc Analytical Services & Materials (page images at HathiTrust)
• An analytical evaluation of airfoil sections for helicopter rotor applications / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Gene J. Bingham and Langley Research Center (page images at HathiTrust)
• Effect of casing treatment on overall and blade-element performance of a compressor rotor / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1971), by Royce D. Moore, Robert J. Blade, George Kovich, Ames Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Control of helicopter rotorblade aerodynamics / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program ; Springfield, Va. : For sale by the National Technical Information Service, 1991), by James A. Fabunmi, AEDAR Corporation, and Ames Research Center (page images at HathiTrust)
• Numerical simulation and comparison of symmetrical/supercritical airfoils for the near tip region of a helicopter in forward flight / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1989), by F. F. Badavi and Langley Research Center (page images at HathiTrust)
• Noise characteristics of eight helicopters / (Washington : Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service ; Springfield, Va. : for sale by the National Technical Information Service, 1977), by Harold C. True, Transportation Systems Center, and United States. Federal Aviation Administration. Systems Research and Development Service (page images at HathiTrust)
• Vibration handbooks for helicopters. (Washington, Distributed by the U.S. Dept. of Commerce. Office of Technical Services, 1954), by Robert A. Wagner (page images at HathiTrust)
• Calibration procedure for spar blade checking and filling unit and spar blade checking unit Sikorsky, part numbers S1670-15000-25 and S1670-15002-2. (Washington, DC : Headquarters, Dept. of the Army, [1984]-), by United States. Department of the Army (page images at HathiTrust)
• Acoustic measurements of the X-wing rotor / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1983), by M. Mosher and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Helicopter rotor blade design for minimum vibration / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1984), by Robert B. Taylor, United Technologies Research Center, Aeromechanics Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• A study of feedback, blade and hub parameters on flap bending due to non-uniform rotor-disk turbulence / (Edwardsville : Southern Illinois University at Edwardsville, Dept. of Mathematical Studies, 1976), by G. H. Gaonkar and A. K. Subramanian (page images at HathiTrust; US access only)
• Charts for estimating rotary wing performance in hover and at high forward speeds / ([Washington] : National Aeronautics and Space Administration, [1964]), by Watson H. Tanner, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Wind tunnel simulation of full scale vortices / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by James B. Rorke, Robert C. Moffitt, Langley Research Center, and United Aircraft Corporation. Sikorsky Aircraft Division (page images at HathiTrust)
• A tabulation of helicopter rotor-blade differential pressures, stresses, and motions as measured in flight / (Washington, D.C. : National Aeronautics and Space Administration, [1964]), by James Scheiman, United States National Aeronautics and Space Administration, and Langley Research Center (page images at HathiTrust)
• Unsteady subsonic and transonic potential flow over helicopter rotor blades / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Morris P. Isom, Ames Research Center, and Polytechnic Institute of New York (page images at HathiTrust)
• Special investigation report : Robinson Helicopter Company R22 loss of main rotor control accidents / (Washington, D.C. : National Transportation Safety Board, [1996]), by United States. National Transportation Safety Board (page images at HathiTrust)
• Theory of self-excited mechanical oscillations of helicopter rotors with hinged blades / (Washington, D.C. : U.S. Government Printing Office, 1958), by Robert F. Coleman, Arnold M. Feingold, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• A study of the torque equilibrium of an autogiro rotor /, by F. J. Bailey and Langley Aeronautical Laboratory (page images at HathiTrust)
• Summary of studies of helicopter rotor icing. (Buffalo, Cornell Aeronautical Laboratory, 1959), by George E. Bartlett (page images at HathiTrust)
• A method for predicting the aerodynamic loads and dynamic response of the rotor blades of a tandem-rotor helicopter. (Ft. Eustis, Va., U.S. Army Aviation Materiel Laboratories, [1967]), by John C. Balcerak (page images at HathiTrust)
• Aerodynamic characteristics of helicopter rotors; rotor contributions to helicopter stability parameters ([Princeton, N.J.] Princeton University [Dept. of Aeronautical Engineering], 1963), by Edward Seckel and H. C. Curtiss (page images at HathiTrust)
• Development of a method for predicting the performance and stresses of VTOL-type propellers. (Fort Eustis, Va., U.S.Army Aviation Materiel Laboratories, 1966), by Andrew Richard Trenka and Cornell Aeronautical Laboratory (page images at HathiTrust)
• US Army helicopter design datcom / (St. Louis, MO. : Army Aviation Systems Command, 1976-), by L. U. Dadone, U.S. Army Air Mobility Research and Development Laboratory. Systems Research Integration Office, and Boeing Vertol Company (page images at HathiTrust; US access only)
• Exploratory investigation of the structure of the tip vortex of a semispan wing for several wing-tip modifications / (Washington, D.C. : National Aeronautics and Space Administration ; [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 22151], 1970), by James Scheiman, James P. Shivers, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
• Comparison of flight-measured helicopter rotor-blade chordwise pressure distributions with static two-dimensional airfoil characteristics / (Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151], 1967), by James Scheiman, Henry L. Kelley, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
• Computed induced velocity, induced drag, and angle of attack distributions for a two-bladed rotor ([Buffalo?, 1963]), by Raymond A. Piziali and Frank A. DuWaldt (page images at HathiTrust)
• Effects of primary rotor parameters on flapping dynamics / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; [Springfield, Va. : For sale by the National Technical Information Service], 1980), by Robert T. N. Chen, Ames Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Performance testing of a main rotor system for a utility helicopter at 1/4 scale / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : National Technical Information Service, distributor, 1982]), by John D. Berry, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Preliminary rotor wake measurements with a laser velocimeter / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1983), by Danny R. Hoad, David B. Rhodes, James F. Meyers, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Transonic flow analysis for rotors. (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by I-Chung Chang and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division (page images at HathiTrust)
• Wind-tunnel evaluation of an advanced main-rotor blade design for a utility-class helicopter / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by William T. Yeager and United States. Army. Aerostructures Directorate (page images at HathiTrust)
• Effect of planform taper on hover performance of an advanced AH-64 model rotor / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987), by Henry L. Kelley, United States. Army Aviation Research and Technology Activity, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Rotor tip clearance effects on overall and blade-element performance of axial-flow transonic fan stage / (Washington, D.C. : National Aeronautics and Space Administation, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by Royce D. Moore and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Establishment of a rotor model basis / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by R. E. McFarland, Ames Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Aeromechanics Laboratory (page images at HathiTrust)
• Prediction of rotating-blade vortex noise from noise of nonrotating blades / (Washington : United States National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by Martin R. Fink, Roy K. Amiet, Robert H. Schlinker, United States National Aeronautics and Space Administration, Langley Research Center, and United Technologies Research Center (page images at HathiTrust)
• Rotary-wing aerodynamics. ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1979), by W. Z. Stepniewski, C. N. Keys, Ames Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Theory of the lifting airscrew = Teoriya nesushchego vinta / (Washington : U.S. National Aeronautics and Space Administration ; Springfield, Va. : for sale by the National Technical Information Service, 1976) (page images at HathiTrust)
• Vibration characteristics of OH-58A helicopter main rotor transmission / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by David G. Lewicki, John J. Coy, United States. Army Aviation Research and Technology Activity. Propulsion Directorate, and Lewis Research Center (page images at HathiTrust)
• Preliminary structural design of composite main rotor blades for minimum weight / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by Mark W. Nixon and United States. Army. Aerostructures Directorate (page images at HathiTrust)
• Rotorcraft flight-propulsion control integration : an eclectic design concept / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1988), by James R. Mihaloew, D. C. G. Ruttledge, Mark G. Ballin, and Lewis Research Center (page images at HathiTrust)
• Advancing-side directivity and retreating-side interactions of model rotor blade-vortex interaction noise / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1988), by R. M. Martin and Langley Research Center (page images at HathiTrust)
• Helicopter main-rotor noise : determination of source contributions using scaled model data / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division ; [Springfield, Va. : For sale by the National Technical Information Service], 1988), by Thomas F. Brooks, Michael A. Marcolini, J. Ralph Jolly, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division (page images at HathiTrust)
• Comparison of analytical and flight test identified aerodynamic derivatives for a tandem-rotor transport helicopter / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1980), by Ward F. Hodge, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• On the nonlinear deformation geometry of Euler-Bernoulli beams / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; [Springfield, Va. For sale by the National Technical Information Service], 1980), by Dewey H. Hodges, D. A. Peters, Robert A. Ormiston, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• An Experimental study of the sensitivity of helicopter rotor blade tracking to root pitch adjustment in hover / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1991), by W. Keats Wilkie and United States. Army. Aerostructures Directorate (page images at HathiTrust)
• Low-speed aerodynamic characteristics of airfoil sections with rounded trailing edges in forward and reverse flow / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service [distributor], 1974), by William D. Beasley, Robert J. McGhee, and Langley Research Center (page images at HathiTrust)
• Helicopter blade-vortex interaction locations : scale-model acoustics and free-wake analysis results / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by Danny R. Hoad and United States. Army Aviation Research and Technology Activity. Aerostructures Directorate (page images at HathiTrust)
• An improved computational procedure for determining helicopter rotor blade natural modes / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1978), by William H. Weller, Raymond E. Mineck, Langley Research Center, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Correlation of helicopter impulsive noise from blade-vortex interaction with rotor mean inflow / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1987), by Andrew B. Connor, R. M. Martin, and Langley Research Center (page images at HathiTrust)
• Wind-tunnel test of an articlulated helicopter rotor model with several tip shapes / (Washington, D.C. : National Aeronautics and Space Administrat ion, Scientific and Technical Information Branch ; [Springfield, Va. : Fo r sale by the National Technical Information Service], 1980), by John D. Berry, Raymond E. Mineck, Army Research and Technology Laboratories (U.S.). Structures Laboratory, United States. Army Aviation Research and Development Command, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Power cepstrum technique with application to model helicopter acoustic data / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1986), by R. M. Martin, C. L. Burley, and Langley Research Center (page images at HathiTrust)
• Compressible, unsteady lifting-surface theory for a helicopter rotor in forward flight / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1985), by Harry L. Runyan, H. Tai, and Langley Research Center (page images at HathiTrust)
• Wind-tunnel investigation of helicopter-rotor wake effects on three helicopter fuselage models / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by John C. Wilson, Raymond E. Mineck, and Langley Research Center (page images at HathiTrust)
• Nonlinear equations for dynamics of pretwisted beams undergoing small strains and large rotations / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1985), by Dewey H. Hodges and Aeromechanics Laboratory (page images at HathiTrust)
• Effect of blade planform variation on the forward-flight performance of small-scale rotors / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992), by Kevin W. Noonan and United States. Army. Aeroflightdynamics Directorate (page images at HathiTrust)
• Experimental evaluation of a flat wake theory for predicting rotor inflow-wake velocities / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992), by John C. Wilson and United States. Army. Aeroflightdynamics Directorate (page images at HathiTrust)
• Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by David A. Conner, Danny R. Hoad, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Experimental investigation of effects of blade tip geometry on loads and performance for an articulated rotor system / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1979), by William H. Weller, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, and Army Research and Technology Laboratories (U.S.). Structures Laboratory (page images at HathiTrust)
• Tail contribution to the directional aerodynamic characteristics of a 1/6-scale model of the rotor systems research aircraft with a tail rotor / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by Raymond E. Mineck and United States National Aeronautics and Space Administration (page images at HathiTrust)
• A rotor-mounted digital instrumentation system for helicopter blade flight research measurements / (Washington : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1978), by Vernie H. Knight, Milton L. Williams, William S. Haywood, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Effect of blade planform variation on a small-scale hovering rotor / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Susan L. Althoff, Kevin W. Noonan, and United States. Army Aerostructures Directorate (page images at HathiTrust)
• Rotor Systems Research Aircraft risk-reduction shake test / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by J. Brent Wellman, United States. Army Aeroflightdynamics Directorate, and Ames Research Center (page images at HathiTrust)
• Performance data from a wind-tunnel test of two main-rotor blade designs for a utility-class helicopter / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Jeffrey D. Singleton, Matthew L. Wilbur, William T. Yeager, and United States. Army Aerostructures Directorate (page images at HathiTrust)
• Wind-tunnel tests of wide-chord teetering rotors with and without outboard flapping hinges / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by William H. Weller, Bill L. Lee, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Loads and performance data from a wind-tunnel test of model articulated helicopter rotors with two different blade torsional stiffnesses / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1983), by William T. Yeager, Wayne R. Mantay, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Modal analysis of UH-60A instrumented rotor blades / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Karen S. Hamade, Robert M. Kufeld, and Ames Research Center (page images at HathiTrust)
• Wind-tunnel survey of an oscillating flow field for application to model helicopter rotor testing / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Paul H. Mirick, William T. Yeager, M-Nabil H. Hamouda, United States. Army Aerostructures Directorate, and Langley Research Center (page images at HathiTrust)
• Low-speed wind-tunnel test of an unpowered high-speed stoppable rotor concept in fixed-wing mode / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1991), by Michael B. Lance, Robert H. Stroub, Daniel Y. Sung, and Langley Research Center (page images at HathiTrust)
• Prediction of helicopter rotor discrete frequency noise : a computer program incorporating realistic blade motions and advanced acoustic formulation / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1986), by Kenneth S. Brentner and Langley Research Center (page images at HathiTrust)
• Effects of planform geometry on hover performance of a 2-meter-diameter model of a four-bladed rotor / ([Washington, DC] : National Aeronautics and Space Administration, 1986), by Arthur E. org AVSCOM Phelps, Susan L. org AVSCOM. Althoff, Langley Research Center, United States. Army Aviation Research and Technology Activity. Aerostructures Directorate, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and United States. Army Aviation Systems Command (page images at HathiTrust)
• Experimental investigation of three helicopter rotor airfoils designed analytically / (Washington : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1979), by Gene J. Bingham, Kevin W. Noonan, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• A computer program to predict rotor rotational noise of a stationary rotor from blade loading coefficients / (Washington : U.S. National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by Ramani Ramakrishnan, Robert N. Hosier, Donald Randall, and Langley Research Center (page images at HathiTrust)
• An analysis of the gust-inducesd overspeed trends of helicopter rotors / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1978), by Julian L. Jenkins, William T. Yeager, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Design and preliminary tests of a blade tip air mass injection system for vortex modification and possible noise reduction on a full-scale helicopter rotor / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Robert J. Pegg and Langley Research Center (page images at HathiTrust)
• Wind-tunnel investigation of the effects of blade tip geometry on the interaction of torsional loads and performance for an articulated helicopter rotor / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1981), by William T. Yeager, Wayne R. Mantay, Langley Research Center, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Effects of repetition rate and impulsiveness of simulated helicopter rotor noise on annoyance / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by Clemans A. Powell, David A. McCurdy, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• The vibration characteristics of a coupled helicopter rotor-fuselage by a finite element analysis / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1983), by Michael J. Rutkowski and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• A new methodology for free wake analysis using curved vortex elements / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division, 1987), by Donald B. Bliss, Todd R. Quackenbush, Milton E. Teske, and Ames Research Center (page images at HathiTrust)
• A method for analyzing the aeroelastic stability of a helicopter rotor in forward flight / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the Clearinghouse for Federal Scientific and Technical Information [distributor], 1969), by Peter Crimi, Applied Science Associates, and Langley Research Center (page images at HathiTrust)
• Investigation of a bearingless helicopter rotor concept having a composite primary structure / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by Richard L. Bielawa, Richard C. Novak, Marvin C. Cheney, United Technologies Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Aeorelastic analysis for helicopter rotor blades with time-variable, nonlinear structural twist and multiple structural redundancy-mathematical derivation and program user's manual / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by Richard L. Bielawa, United Technologies Research Center, United States National Aeronautics and Space Administration, Langley Research Center, and U.S. Army Air Mobility Research and Development Laboratory (page images at HathiTrust)
• Development of an analysis for the determination of coupled helicopter rotor/control system dynamic response / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Lawrence R. Sutton, Stephen A. Rinehart, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• Two-dimensional wind tunnel test of an oscillating rotor airfoil, volume I / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by L. U. Dadone and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Two-dimensional wind tunnel test of an oscillating rotor airfoil, volume II / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by L. U. Dadone, Boeing Vertol Company, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• The passage of an infinite swept airfoil through an oblique gust / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by John J. Adamczyk, Langley Research Center, and United Aircraft Corporation. Research Laboratories (page images at HathiTrust)
• Sensitivity analysis of torsional vibration characteristics of helicopter rotor blades / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service, 1974]), by Theodore Bratanow, Akin Ecer, Langley Research Center, and University of Wisconsin--Milwaukee (page images at HathiTrust)
• An experimental study of rotor blade-vortex interaction / (Washington, D.C. : National Aeronautics and Space Administration, 1970), by Makam Surendraiah, United States National Aeronautics and Space Administration, Langley Research Center, and Pennsylvania State University (page images at HathiTrust)
• A method for determining the characteristic functions associated with the aeroelastic instabilities of helicopter rotors in forward flight / (Washington, D.C. : National Aeronautics and Space Administration ; Springfield, VA : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1970), by Vincent James Piarulli, Richard P. White, United States National Aeronautics and Space Administration, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• Analysis of stall flutter of a helicopter rotor blade / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973), by Peter Crimi, Langley Research Center, and Avco Corporation. Systems Division (page images at HathiTrust)
• Evaluation of the annoyance due to helicopter rotor noise / (Washington : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1978), by Harry Sternfeld, Linda Bukowski Doyle, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Helicopter rotor trailing edge noise / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1981), by Robert H. Schlinker, Roy K. Amiet, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• Coupled rotor/airframe vibration analysis / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by Robert Sopher, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, United Technologies Corporation. Sikorsky Aircraft Division, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and Langley Research Center (page images at HathiTrust)
• Helicopter vibration suppression using simple pendulum absorbers on the rotor blade / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by G. Alvin Pierce, M-Nabil H. Hamouda, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• Experimental smoke and electromagnetic analog study of induced flow field about a model rotor in steady flight within ground effect / (Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Office of Technical Services, Dept. of Commerce, [1960]), by Robin B. Gray and Lewis Research Center (page images at HathiTrust)
• Vibratory loads data from a wind-tunnel test of structurally tailored model helicopter rotors / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program ; Springfield, Va. : For sale by the National Technical Information Service, 1991), by William T. Yeager and United States. Army. Aerostructures Directorate (page images at HathiTrust)
• A Synchronous strobed laser light sheet for rotor flow visualization / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1991), by Bradley D. Leighty and Langley Research Center (page images at HathiTrust)
• Development and validation of a combined rotor-fuselage induced flow-field computational method / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; [Springfield, Va. : For sale by the National Technical Information Service], 1980), by Carl E. Freeman, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Application of the ONERA model of dynamic stall / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1984), by Kenneth W. McAlister, D. Petot, O. Lambert, and Aeromechanics Laboratory (page images at HathiTrust)
• Thermal analysis of a planetary transmission with spherical roller bearings operating after complete loss of oil / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1984), by Harold H. Coe and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Results of the first complete static calibration of the RSRA rotor-load-measurement system / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1984), by C. W. Acree and Ames Research Center (page images at HathiTrust)
• An assessment of the capability to calculate tilting prop-rotor aircraft performance, loads, and stability / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1984), by Wayne Johnson and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Aerodynamic characteristics of three helicopter rotor airfoil sections at Reynolds numbers from model scale to full scale at Mach numbers from 0.35 to 0.90 / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1980), by Kevin W. Noonan, Gene J. Bingham, Army Research and Technology Laboratories (U.S.). Structures Laboratory, United States. Army Aviation Research and Development Command, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Calculation of three-dimensional unsteady transonic flows past helicopter blades / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1980), by J. J. Chattot, Aeromechanics Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• An experimental investigation of the flap-lag-torsion aeroelastic stability of a small-scale hingeless helicopter rotor in hover / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1986), by David L. Sharpe, United States. Army Aviation Research and Technology Activity. Aeroflightdynamics Directorate, and Ames Research Center (page images at HathiTrust)
• Acoustic measurements from a rotor blade-vortex interaction noise experiment in the German-Dutch wind tunnel (DNW) / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988), by R. M. Martin, United States. Army Aviation Research and Technology Activity, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division (page images at HathiTrust)
• Effect of rotor wake on aerodynamic characteristics of a 1/6-scale model of the rotor systems research aircraft / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by Raymond E. Mineck and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Investigation of blade impulsive noise on a scaled fully articulated rotor system / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by James Scheiman, Danny R. Hoad, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Aerodynamic performance of a 0.27-scale model of an AH-64 helicopter with baseline and alternate rotor blade sets / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1990), by Henry L. Kelley and United States. Army Aerostructures Directorate (page images at HathiTrust)
• Application of a PC-based, real-time, data-acquisition system in rotorcraft wind-tunnel testing / (Washington, D.C. : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; Springfield, Va. : For sale by the National Technical Information Service, 1989), by Matthew L. Wilbur and Langley Research Center (page images at HathiTrust)
• Numerical analysis of the first static calibration of the RSRA helicopter active-isolator rotor balance system / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va. : For sale by the National Technical Information Service, 1985), by C. W. Acree and Ames Research Center (page images at HathiTrust)
• Application of special-purpose digital computers to rotorcraft real-time simulation / ([Washington] : National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va. : For sale by the National Technical Information Service, 1978), by D. Brian Mackie, Seth Michelson, Computer Sciences Corporation, Ames Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Description of the U.S. Army small-scale 2-meter rotor test system / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1987), by Arthur E. Phelps and John D. Berry (page images at HathiTrust)
• Analytical investigation of the effects of blade flexibility, unsteady aerodynamics, and variable inflow on helicopter rotor stall characteristics / (Washington, D.C. : National Aeronautics and Space Administration, 1971), by E. D. Bellnger, United States National Aeronautics and Space Administration, United Aircraft Corporation. Research Laboratories, and Langley Research Center (page images at HathiTrust)
• Analysis of helicopter rotor blade torsional oscillations due to stall / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Peter Crimi, U.S. Army Air Mobility Research and Development Laboratory, Langley Research Center, and Avco Corporation. Systems Division (page images at HathiTrust)
• Determination of rotor harmonic blade loads from acoustic measurements / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1975), by Peter K. Kasper, U.S. Army Air Mobility Research and Development Laboratory, Langley Research Center, and Wyle Laboratories (page images at HathiTrust)
• Investigation of nonlinear inviscid and viscous flow effects in the analysis of dynamic stall / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Peter Crimi, Langley Research Center, and Avco Corporation. Systems Division (page images at HathiTrust)
• The vortex lattice method for the rotor-vortex interaction problem / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Raghuveera Padakannaya, Langley Research Center, and Pennsylvania State University (page images at HathiTrust)
• The effect of helicopter main rotor blade phasing and spacing on performance, blade loads, and acoustics / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : for sale by the National Technical Information Service, 1976), by Santu T. Gangwani, Systems Research Laboratories. Rasa Division, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Hover performance tests of full scale variable geometry rotors / (Washington : U.S. National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by James B. Rorke, United States National Aeronautics and Space Administration, Langley Research Center, United Technologies Corporation, and U.S. Army Air Mobility Research and Development Laboratory (page images at HathiTrust)
• Noise of a model helicopter rotor due to ingestion of turbulence / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1979), by Robert W. Paterson, Roy K. Amiet, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Analysis and correlation of test data from an advanced technology rotor system / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1983), by D. Jepson, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Ames Research Center, and United Technologies Corporation (page images at HathiTrust)
• Application of higher harmonic blade feathering on the OH-6A helicopter for vibration reduction / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, VA : for sale by the National Technical Information Service, 1986), by F. K. Straub, E. V. Byrns, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Langley Research Center, and McDonnell Douglas Helicopter Company (page images at HathiTrust)
• Rotorcraft blade mode damping identification from random responses using a recursive maximum likelihood algorithm / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. : For sale by the National Technical Information Service], 1982), by John A. Molusis, Army Research and Technology Laboratories (U.S.). Structures Laboratory, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• Surface pressure measurements at two tips of a model helicopter rotor in hover / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Office ; [Springfield, Va. : For sale by the National Technical Information Service], 1980), by R. B. Gray, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Research investigation of helicopter main rotor/tail rotor interaction noise / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988), by J. Fitzgerald, F. Kohlhepp, and Lewis Research Center (page images at HathiTrust)
• An unsteady helicopter rotor : fuselage interaction analysis / (Washington, D.C. : National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988), by Peter F. Lorber, T. Alan Egolf, United States. Army Aerostructures Directorate, and Langley Research Center (page images at HathiTrust)
• Response of a helicopter rotor to an increase in collective pitch for the case of vertical flight / (Washington : National Aeronautics and Space Administration, 1961), by Jean Rebont, Jean Soulez-Larivière, and Jacques Valensi (page images at HathiTrust)
• Wind-tunnel study of the response in lift of a rotor to an increase in collective pitch in the case of vertical flight near the autorotative regime / (Washington, D.C. : National Aeronautics and Space Administration, 1960), by Jean Rebont, Jean Soulez-Larivière, and Jacques Valensi (page images at HathiTrust)
• Response of rotor lift to an increase in collective pitch in the case of descending flight, the regime of the rotor being near autorotation / (Washington, D.C. : National Aeronautics and Space Administration, 1960), by Jean Rebont, Jean Soulez-Larivière, and Jacques Valensi (page images at HathiTrust)
• Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades / (Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1974), by Dewey H. Hodges, E. H. Dowell, U.S. Army Air Mobility Research and Development Laboratory, and Ames Research Center (page images at HathiTrust)
• A real-time, dual processor simulation of the rotor sysem research aircraft / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by D. Brian Mackie, Thomas S. Alderete, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Correlation of full-scale helicopter rotor performance in air with model-scale freon data / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by William T. Yeager, Wayne R. Mantay, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Stability of elastic bending and torsion of uniform cantilever rotor blades in hover with variable structural coupling / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1976), by Dewey H. Hodges, Robert A. Ormiston, Ames Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Airframe, wing, and tail aerodynamic characteristics of a 1/6-scale model of the rotor systems research aircraft with the rotors removed / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by Raymond E. Mineck, Carl E. Freeman, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• The dynamic response of a flexible rotor blade to a concentrated force moving from tip to root / (Washington, D.C. : National Aeronautics and Space Administration ; [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 20230], 1969), by John F. Ward, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Investigation of level-flight and maneuvering characteristics of a hingeless-rotor compound helicopter / (Washington, D.C. : National Aeronautics and Space Administration ; [For sale for Federal Scientific and Technical Information, Springfield, Virginia 22151], 1970), by Julian L. Jenkins, Perry L. Deal, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Load and stability measurements on a soft-inplane rotor system incorparting elsatomeric lead-lag dampers / (Washington : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1977), by William H. Weller, U.S. Army Air Mobility Research and Development Laboratory, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Effects of rotor model degradation on the accuracy of rotorcraft real-time simulation / (Washington : National Aeronautics and Space Administration : Springfield, Va. : For sale by the National Technical Information Service, 1976), by Jacob A. Houck, Roland L. Bowles, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Wind-tunnel measurements on a lifting rotor at high thrust coefficients and high tip-speed ratios / (Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia], 1964), by George E. Sweet, Matthew M. Winston, Julian L. Jenkins, United States National Aeronautics and Space Administration, and Langley Research Center (page images at HathiTrust; US access only)
• A parametric study of blade-motion stability boundaries for an articulated rotor / (Washington, D.C. : National Aeronautics and Space Administration ; [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia 20230], 1969), by Julian L. Jenkins, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
• An hovering investigation of an extremely flexible lifting rotor / (Washington, D.C. : National Aeronautics and Space Administration, 1968), by Matthew M. Winston, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
• The normal component of the induced velocity in the vicinity of a lifting rotor and some examples of its application / (Washington, D.C. : National Advisory Committee for Aeronautics, 1953), by Walter Castles, Jacob Henri De Leeuw, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Studies of the lateral-directional flying qualities of a tandem helicopter in forward flight / (Washington, D.C. : National Advisory Committee for Aeronautics, 1953), by Kenneth B. Amer, Robert J. Tapscott, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Noise characteristics of eight helicopters : final report : prepared for U.S. Dept. of Transportation, Federal Aviation Administration, Systems Research and Development Service / (Washington : Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service ; Springfield, Va. : available through the National Technical Information Service, 1977), by Harold C. True and United States. Federal Aviation Administration. Systems Research and Development Service (page images at HathiTrust)
• Mechanical ice release processes. (Hanover, N.H. : Cold Regions Research and Engineering Laboratory, 1983), by Kazuhiko Itagaki (page images at HathiTrust)
• Effect of compressibility on the hovering performance of two 10-foot-diameter helicopter rotors tested in the Langley full-scale tunnel / (Washington, D.C. : NACA, 1958), by Joseph W. Jewel, Robert D. Harrington, United States. National Advisory Committee for Aeronautics, and Langley Aeronautical Laboratory (page images at HathiTrust)
• Normal component of induced velocity in the vicinity of a lifting rotor with a nonuniform disk loading / (Washington, D.C. : National Advisory Committee for Aeronautics, [1956]), by Harry H. Heyson, S. Katzoff, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• An analysis of the autorotative performance of a helicopter powered by rotor-tip jet units / (Washington, D.C. : National Advisory Committee for Aeronautics, 1950), by Alfred Gessow and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Effects of compressibility on the performance of two full-scale helicopter rotors / (Washington, D.C. : National Advisory Committee for Aeronautics, 1951), by Paul J. Carpenter and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight / (Washington, D.C. : National Advisory Committee for Aeronautics, [1954]), by Kenneth B. Amer, Alfred Gessow, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Differential equations of motion for combined flapwise bending, chordwise bending, and torsion of twisted nonuniform rotor blades / (Washington : National Advisory Committee for Aeronautics, [1957]), by John C. Houbolt, George W. Brooks, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Stalling of helicopter blades / (Washington D.C. : National Advisory Committee for Aeronautics ;, 1946), by F. B. Gustafson, G. C. Myers, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Directional stability characteristics of two types of tandem helicopter fuselage models / (Washington, D.C. : National Advisory Committee for Aeronautics, 1954), by James L. Williams and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Static-thrust tests of six rotor-blade designs on a helicopter in the Langley full-scale tunnel / (Washington, D.C. : National Advisory Committee for Aeronautics, [1945]), by Richard C. Dingeldein, Raymond F. Schaefer, Langley Aeronautical Laboratory, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• Charts for estimation of the characteristics of a helicopter rotor in forward flight. 1 - Profile drag-lift ratio for untwisted rectangular blades / (Washington, D.C. : National Advisory Committee for Aeronautics, [1944]), by F. J. Bailey, F. B. Gustafson, Langley Aeronautical Laboratory, and United States. National Advisory Committee for Aeronautics (page images at HathiTrust)
• A method for assessing the impact of wake vortices of USAF operations /, by George Kurylowich, sponsor Air Force Flight Dynamics Laboratory (U.S.), and issuing body United States. Air Force. Systems Command (page images at HathiTrust)
• Investigation of helicopter rotor blade flutter and flapwise bending response in hovering /, by Frank A. DuWaldt, R. A. Piziali, C. A. Gates, issuing body Wright Air Development Center, sponsor Cornell Aeronautical Laboratory, and sponsor United States. Air Force. Air Research and Development Command (page images at HathiTrust)
• Study of helicopter rotor-rotor interference effects on hub vibration /, by Jean Fernand Duvivier and sponsor United States. Air Force. Systems Command. Aeronautical Systems Division (page images at HathiTrust)
• Helicopter-type rotor decelerators /, by R. R. Tyndall, sponsor Air Force Materials Laboratory (U.S.), and issuing body United States. Air Force. Systems Command. Aeronautical Systems Division (page images at HathiTrust)

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