NASA NTRS · 19930094589
Helicopter problems
Abstract
The present report deals with a number of the main problems requiring solution in the development of helicopters and concerning the lift, flying performance, stability, and drive. A complete solution is given for the stability of the helicopter with rigid blades and control surfaces. With a view to making a direct-lift propeller sufficient without the addition of auxiliary propellers, the "flapping drive" is assessed and its efficiency calculated.
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Kussner, H G. 1937-05-01. Helicopter problems. https://ntrs.nasa.gov/citations/19930094589
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