An evaluation of linearized vortex theory as applied to single and multiple rotors hovering in and out of ground effect, by Harry H. Heyson et al.

Title:	An evaluation of linearized vortex theory as applied to single and multiple rotors hovering in and out of ground effect
Author:	Heyson, Harry H.
Author:	Langley Research Center
Note:	National Aeronautics and Space Administration, 1959

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Subject:	Aerodynamic configurations
Subject:	Aerodynamic interference
Subject:	Flow distribution
Subject:	Flow theory
Subject:	Full scale tests
Subject:	Ground-cushion phenomenon
Subject:	Helicopter wakes
Subject:	Hovering
Subject:	Linear systems
Subject:	Rotary wings
Subject:	Tandem rotor helicopters
Subject:	Upwash
Subject:	Vertical takeoff aircraft
Subject:	Vortices
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