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Flight testing a V/STOL aircraft to identify a full-envelope aerodynamic modelFlight-test techniques are being used to generate a data base for identification of a full-envelope aerodynamic model of a V/STOL fighter aircraft, the YAV-8B Harrier. The flight envelope to be modeled includes hover, transition to conventional flight and back to hover, STOL operation, and normal cruise. Standard V/STOL procedures such as vertical takeoff and landings, and short takeoff and landings are used to gather data in the powered-lift flight regime. Long (3 to 5 min) maneuvers which include a variety of input types are used to obtain large-amplitude control and response excitations. The aircraft is under continuous radar tracking; a laser tracker is used for V/STOL operations near the ground. Tracking data are used with state-estimation techniques to check data consistency and to derive unmeasured variables, for example, angular accelerations. A propulsion model of the YAV-8B's engine and reaction control system is used to isolate aerodynamic forces and moments for model identification. Representative V/STOL flight data are presented. The processing of a typical short takeoff and slow landing maneuver is illustrated.
Document ID
19880014378
Document Type
Technical Memorandum (TM)
Authors
Mcnally, B. David (NASA Ames Research Center Moffett Field, CA, United States)
Bach, Ralph E., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1988
Subject Category
AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number
NAS 1.15:100996
NASA-TM-100996
A-88139
Funding Number(s)
PROJECT: RTOP 505-66-41
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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