Abstract
A new explanation is advanced for the cause of vibrations in rotary wing systems in forward flight, based on the fact tha t the down-wash is greater in the rear part of the swept disc than in the front part . An estimate of the magnitude of the down-wash variation at different forward speeds is made with the aid of data previously published by the N.A.C.A. on tests of a 10-ft. gyroplane rotor. This nonuniform down-wash causes a periodic change in the drag force on a blade and is a cause of forced vibrations, especially noticeable in two-bladed rotors at low air speeds.
Published Version
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