When an engine without a muffler or a rifle makes noise when the gas escapes from behind the exhaust value or from behind the bullet, I assume that there is a threshold of pressure below which the escapement is much quieter.What is that pressure?TIA

It's not pressure by itself, but rather the velocity of the gasses (afunction of pressure) that is the turning point--at sea level it's 1115.7feet per second. Above that velocity is where rifle bullets develop the"crack" sound.atheists that will destroy the society. It is Darwinian.

On 22 Jan 2004 05:00:10 -0800, (?mund Breivik) wrote:

?Threshold pressure for supersonic gas escaping?

Jan 19, 2004 22 Replies

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Larry Jaques 22 years ago

On Thu, 22 Jan 2004 17:23:53 -0500, Glenn Ashmore brought forth from the murky depths:

I thought they were supposed to be set up in sets of 3, one set for each side. Even so, a pair of JATOs should get you over 35 knots in a streamlined cutter profile. What's up?

ETA for that, sir?

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Gary Coffman 22 years ago

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Backlash 22 years ago

If you want to hear some really strange exhaust noise, take a full stick of screw pipe and put it temporarily on a small engine in place of the muffler. Support it on the outer end, and fire it up. We did this once as kids, as a hoot.

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