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Preliminary airborne measurements for the SR-71 sonic boom propagation experimentSR-71 sonic boom signatures were measured to validate sonic boom propagation prediction codes. An SR-71 aircraft generated sonic booms from Mach 1.25 to Mach 1.6, at altitudes of 31,000 to 48,000 ft, and at various gross weights. An F-16XL aircraft measured the SR-71 near-field shock waves from close to the aircraft to more than 8,000 ft below, gathering 105 signatures. A YO-3A aircraft measured the SR-71 sonic booms from 21,000 to 38,000 feet below, recording 17 passes. The sonic booms at ground level and atmospheric data were recorded for each flight. Data analysis is underway. Preliminary results show that shock wave patterns and coalescence vary with SR-71 gross weight, Mach number, and altitude. For example, noncoalesced shock wave signatures were measured by the YO-3A at 21,000 ft below the SR-71 aircraft while at a low gross weight, Mach 1.25, and 31,000-ft altitude. This paper describes the design and execution of the flight research experiment. Instrumentation and flight maneuvers of the SR-71, F-16XL, and YO-3A aircraft and sample sonic boom signatures are included.
Document ID
19960002619
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Haering, Edward A., Jr. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Ehernberger, L. J. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Whitmore, Stephen A. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-104307
NAS 1.15:104307
H-2068
Meeting Information
Meeting: NASA High Speed Research Program Sonic Boom Workshop
Location: Hampton, VA
Country: United States
Start Date: September 11, 1995
End Date: September 13, 1995
Accession Number
96N12627
Funding Number(s)
PROJECT: RTOP 537-03-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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