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Flush Airdata Sensing (FADS) System Calibration Procedures and Results for Blunt ForebodiesBlunt-forebody pressure data are used to study the behavior of the NASA Dryden Flight Research Center flush airdata sensing (FADS) pressure model and solution algorithm. The model relates surface pressure measurements to the airdata state. Spliced from the potential flow solution for uniform flow over a sphere and the modified Newtonian impact theory, the model was shown to apply to a wide range of blunt-forebody shapes and Mach numbers. Calibrations of a sphere, spherical cones, a Rankine half body, and the F-14, F/A-18, X-33, X-34, and X-38 configurations are shown. The three calibration parameters are well-behaved from Mach 0.25 to Mach 5.0, an angle-of-attack range extending to greater than 30 deg, and an angle-of-sideslip range extending to greater than 15 deg. Contrary to the sharp calibration changes found on traditional pitot-static systems at transonic speeds, the FADS calibrations are smooth, monotonic functions of Mach number and effective angles of attack and sideslip. Because the FADS calibration is sensitive to pressure port location, detailed measurements of the actual pressure port locations on the flight vehicle are required and the wind-tunnel calibration model should have pressure ports in similar locations. The procedure for calibrating a FADS system is outlined.
Document ID
19990110310
Acquisition Source
Armstrong Flight Research Center
Document Type
Conference Paper
Authors
Cobleigh, Brent R. (NASA Dryden Flight Research Center Edwards, CA United States)
Whitmore, Stephen A. (NASA Dryden Flight Research Center Edwards, CA United States)
Haering, Edward A., Jr. (NASA Dryden Flight Research Center Edwards, CA United States)
Borrer, Jerry (NASA Johnson Space Center Houston, TX United States)
Roback, V. Eric (NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 19, 2013
Publication Date
November 1, 1999
Subject Category
Aircraft Instrumentation
Report/Patent Number
NASA/TP-1999-209012
NAS 1.60:209012
H-2379
AIAA Paper 99-4816
Meeting Information
Meeting: International Space Planes and Hypersonic Systems and Technologies
Location: Norfolk, VA
Country: United States
Start Date: November 1, 1999
End Date: November 5, 1999
Funding Number(s)
PROJECT: RTOP 242-33-02-00-23
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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