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Whirl Flutter Studies for a SSTOL Transport DemonstratorA proposed new class of aircraft - the Advanced Theater Transport (ATT) will combine strategic range and high payload with 'Super-STOL' (short take-off and landing) capability. It is also proposed to modify a YC-15 into a technology demonstrator with a 20-deg tilt wing; four, eight-bladed propellers; cross-shafted gearboxes and V-22 engines. These constitute a unique combination of design features that potentially affect performance, loads and whirl-mode stability (whirl flutter). NASA Ames Research Center is working with Boeing and Hamilton Sundstrand on technology challenges presented by the concept; the purpose of NASA involvement is to establish requirements for the demonstrator and for early design guidance, with emphasis on whirl flutter. CAMRAD II is being used to study the effects of various design features on whirl flutter, with special attention to areas where such features differ from existing aircraft, notably tiltrotors. Although the stability margins appear to be more than adequate, the concept requires significantly different analytical methods, principally including far more blade modes, than typically used for tiltrotors.
Document ID
20050009924
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Acree, C. W., Jr.
(NASA Ames Research Center Moffett Field, CA, United States)
Hoffman, Krishna
(Boeing Phantom Works Huntington Beach, CA, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Aerodynamics
Meeting Information
Meeting: American Helicopter Society 4th Decennial Specialist''s Conference on Aeromechanics
Location: San Francisco, CA
Country: United States
Start Date: January 21, 2004
End Date: January 23, 2004
Sponsors: American Helicopter Society, Inc.
Distribution Limits
Public
Copyright
Other

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