Techride Message Board - Msg: 12332569

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To: Peach who wrote (6580)	12/19/1999 6:12:00 PM
From: Jacques Chitte	Read Replies (1) of 7442

Ooh! OOooh! I know this one! When the shuttle engines kick in, they are LOUD. Loud enough to send 185 and more decibels shivering through the external tank's structure. That's enough vibration to break things. So they have this really big tank of water by the launch pad, and right when they're ready to light the candle they make a big waterfall in the jet deflection pit. This absorbs a lot of the acoustic energy from five roaring rocket exhausts and protects the ship from shaking itself apart. They did this for the saturn V also. If you look at those marvelous archive videos of five F-1s doing their bad thang, there is all this water rushing into the blast pit. One function is to keep 7.5 million pounds of thrust from doing a cutting torch number on the concrete. But absorbing engine noise before it could shake the stack to bits was the bigger reason.

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