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Effects of Rotor Design Variations on Tiltrotor Whirl-Mode StabilityUltimate tiltrotor performance is constrained by coupled wing/rotor whirl-mode aeroelastic instability. A multifaceted research effort to alleviate those constraints is currently underway at NASA Ames Research Center. Design changes to the XV-15 rotor created large increases in the predicted stability boundary; alternatively, they allowed large increases in pitch-flap coupling (delta-three) for a given stability margin. A wind-tunnel experiment has been proposed to demonstrate the improvements at minimum cost. The design methods are also being applied to the V-22. This report summarizes the results to date for the V-22 and compares them to those for the XV-15. A proposed small-scale wind-tunnel model of the XV-15 proprotor is described.
Document ID
20010114155
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Acree, C. W., Jr.
(NASA Ames Research Center Moffett Field, CA United States)
Rutkowski, Michael
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: Tiltrotor/Runway Independent Aircraft Technology and Applications Specialists Meeting
Location: Arlington, TX
Country: United States
Start Date: March 1, 2001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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