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Pushing loudness to a whole different level!
john sanders:
The following was taken from Road & Track, April 2011,Volume 62, Number 8 and I hope you may find this as fascinating as I did:
"For the onlookers standing at the NASA Causeway six miles away (the closest public viewing area), you first see the shuttle rise and its white exhaust plume billow out of the flame trench in silence. Moments later you hear the rocket engines and feel the crackling noise pulsating past you. The sound pressure energy level at the launch pad is about 220 (db), and at amile away, 135, where your hearing would still be damaged. Human death occurs at around 200 db due to intense vibration of the internal organs.NASA says that at 400 feet away, the heat will kill you. And at 800, the sound will. Watching the shuttle launch from six miles away doesn't seem too distant after all.
Steve Hurt:
Be curious to know how loud it is inside the shuttle.
john sanders:
--- Quote from: Steve Hurt on February 27, 2011, 08:34:30 PM ---Be curious to know how loud it is inside the shuttle.
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john sanders:
--- Quote from: john sanders on February 27, 2011, 09:23:32 PM ---
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Steve, Interesting question. While I don't have the answer for you, I'm sure the shuttle is well insulated and in addition so are the astronauts helmets. 44 seconds after liftoff the shuttle is traveling at Mach 1 (735 mph.) and by 8 minutes 30 seconds it's traveling at 17,000 mph. That's a lot faster than the speed of sound.
Lee Buckalew:
--- Quote from: john sanders on February 27, 2011, 07:17:26 PM ---The following was taken from Road & Track, April 2011,Volume 62, Number 8 and I hope you may find this as fascinating as I did:
"For the onlookers standing at the NASA Causeway six miles away (the closest public viewing area), you first see the shuttle rise and its white exhaust plume billow out of the flame trench in silence. Moments later you hear the rocket engines and feel the crackling noise pulsating past you. The sound pressure energy level at the launch pad is about 220 (db), and at amile away, 135, where your hearing would still be damaged. Human death occurs at around 200 db due to intense vibration of the internal organs.NASA says that at 400 feet away, the heat will kill you. And at 800, the sound will. Watching the shuttle launch from six miles away doesn't seem too distant after all.
--- End quote ---
Here's a link to some interesting info (which also has a link to a great surround sound recording of the Launch). I was fortunate enough to be able to Talk to Bob Katz about this project. It was a truly phenomenal job. The recordings were done 3.1 miles from the launch pad.
http://www.musicofsound.co.nz/blog/space-shuttle-lift-off-at-24bit-96k
In this link, Bob responds to some criticism. There is also information about acoustical limits for some of the shuttle structure and how this problem was overcome.
Lee Buckalew
Pro Sound Advice, Inc.
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