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Low-Speed Wind-Tunnel Test of an Unpowered High-Speed Stoppable Rotor Concept in Fixed-Wing ModeAn experimental investigation of the M85, a High Speed Rotor Concept, was conducted at the NASA Langley 14 x 22 foot Subsonic Tunnel, assisted by NASA-Ames. An unpowered 1/5 scale model of the XH-59A helicopter fuselage with a large circular hub fairing, two rotor blades, and a shaft fairing was used as a baseline configuration. The M85 is a rotor wing hybrid aircraft design, and the model was tested with the rotor blade in the fixed wing mode. Assessments were made of the aerodynamic characteristics of various model rotor configurations. Variation in configurations were produced by changing the rotor blade sweep angle and the blade chord length. The most favorable M85 configuration tested included wide chord blades at 0 deg sweep, and it attained a system lift to drag ratio of 8.4.
Document ID
19910008720
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Lance, Michael B.
(Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Sung, Daniel Y.
(Sterling Software Palo Alto, CA., United States)
Stroub, Robert H.
(NASA Ames Research Center Moffett Field, CA., United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1991
Subject Category
Aerodynamics
Report/Patent Number
L-16716
NAS 1.15:4250
NASA-TM-4250
Accession Number
91N18033
Funding Number(s)
PROJECT: RTOP 505-61-51-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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