LOADING...
Text Size
Flight Research Projects - SR-71 Sonic Boom Recordings
June 27, 2011
 
 

SR-71 Sonic Boom Recordings


Minidisc comparison to quarter

These recordings were made as part of the SR-71 Sonic Boom Propagation Experiment, using Bruel & Kierr Type 4134 1/2" Microphones, Type 2804 Power Supplies, and Sony MZ-R2 Minidisc Recorders. They were then digitized with a Macintosh PowerPC 9600 via the program Canary 1.2, and converted to QuickTime with MoviePlayer. Aircraft flight conditions are shown for the times predicted by the sonic boom simulation program PCBoom.*

Click on any of the pictures to bring up the QuickTime movie. QuickTime is available for Macintosh and PC computers. For best results, listen with headphones that block out outside noises and use a high volume setting.

 

Flight 23 2/15/95 17:36:21 Elevated South Station
bird at t=0.5 and t=8.4, SR-71 at t=2.8, F-16XL at t=3.6, other A/C noise, recorded using auto record level.
47K JPEG picture
954KB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.25 30,200 ft
F-16XL 1.16 29,100
 
Flight 23 2/15/95 18:26:41 Elevated South Station
bird at t=0.8, 3.5, and 10.0, F-16XL at t=5.3, SR-71 at t=5.6, footstep at t=11.5, recorded using auto record level.
44K JPEG picture
1.046MB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.25 30,300 ft
F-16XL 1.11 27,100 ft
 
Flight 24 3/16/95 18:24:20 Elevated Base Station
SR-71 at t=1.0, SR-71 U-wave at t=2.0, F-16XL NU-wave at t=6.0, recorded using manual record level.
30K JPEG picture
611KB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.27 30,500 ft
F-16XL 1.30 27,800 ft
Flight 30 4/20/95 14:39:35 Elevated Base Station
wind, rumble at t=2.0, recorded using manual record level, no sharp boom heard. The aircraft were too high in altitude at these Mach numbers for the sonic booms to reach the ground, only the acoustical portion did, much like distant thunder.
48K JPEG picture
358KB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.23 43,900 ft
F-16XL 1.29 38,800 ft
 
Flight 30 4/20/95 15:27:21 Elevated Base Station
wind, SR-71 rumble at t=3.2, F-16XL at t=6.8, other at t=11.0, recorded using manual record level. PCBoom had an error calculating the F-16XL boom generation time.
38K JPEG picture
1.129MB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.25 44,000 ft
F-16XL ? ?
 
Flight 31 5/25/95 15:42:23 Elevated South Station
SR-71 at t=1.0, bird at t=1.3, recorded using manual record level.
35K JPEG picture
307KB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.58 43,000 ft
 
Flight 31 5/25/95 16:02:51 Elevated South Station
SR-71 at t=1.7, bird at t=0.4 and 8.1, creaking shoe at t=2.3, recorded using manual record level.
31K JPEG picture
864KB QuickTime movie
Aircraft Mach Number Pressure Altitude
SR-71 1.21 30,200 ft
 
102KB JPEG bird picture

The bird in these recordings has been identified as probably an American Pipit (Anthus rubescens). The bird's song does not generally change after a sonic boom is heard.

*NOTICE: Use of trade names of manufacturers in this document does not constitute an official endorsement of such products or manufacturers, either express or implied, by the National Aeronautics and Space Administration.

These recordings are not available for copyright protection in the U.S. (17 U.S.C. 105). NASA is the owner of any foreign copyright.

Other Sonic Boom links:

  • Preliminary Airborne Measurements for the SR-71 Sonic Boom Propagation Experiment, Haering, Edward A., Jr., Ehernberger, L. J., and Whitmore, Stephen A., NASA TM-104307, 1995.
  • Ground-Based Sensors for the SR-71 Sonic Boom Propagation Experiment, Norris, Stephen R., Haering, Edward A., Jr., Murray, James E., NASA TM-104310, 1995.
  • Ground-Recorded Sonic Boom Signatures of F-18 Aircraft in Formation Flight, Bahm, Catherine M., and Haering, Edward A., Jr., NASA TM-104312, 1995.
  • Dryden Fact Sheet: Sonic Booms
  • Dryden Fact Sheet: Schlieren Photography - Ground to Air

Image Token: 
[image-47]
Image Token: 
[image-62]
Page Last Updated: July 28th, 2013
Page Editor: NASA Administrator