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Effects of V‐22 Blade Modifications on Whirl Flutter and Loads

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A CAMRAD II model of the V‐22 Osprey tiltrotor was constructed for the purpose of analyzing the effects of blade design changes on whirl flutter. The model incorporated a dual load‐path grip/yoke assembly, a swashplate coupled to the transmission case, and a drive train. A multiple‐trailer free‐vortex wake model was used for loads calculations. The effects of rotor design changes on whirl‐mode stability were calculated for swept blades and offset tip masses. A rotor with swept tips and inboard tuning masses was examined in detail to reveal the mechanisms by which these design changes affect stability and loads. Certain combinations of design features greatly increased whirl‐mode stability, with (at worst) moderate increases to loads.

Document Type: Research Article


Affiliations: NASA Ames Research Center, Moffett Field, CA

Publication date: 2005-07-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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    Authors can find submission guidelines and related information on the AHS website.

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