February 28, 2015, 10:29 PM | #26 | ||
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T. O'Heir said:
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February 28, 2015, 11:10 PM | #27 |
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When I'm cleaning the barrel of a muzzle loader, sometimes I will pull the cleaning rod out really fast and the vacuum in the bore make a high pitched "pook" kind of noise. You'll never confuse it with muzzle blast.
Sometimes that "pook" noise is followed by cursing and swearing because it sucked the patch off the cleaning jag and back into the bore, meaning I have to hunt for a worm (looks like a miniature corkscrew) to attach to the cleaning rod to fish the patch out of the bore.
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February 28, 2015, 11:48 PM | #28 |
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That pop sound from air rushing into the barrel when a cleaning rod vacuum is broken is not very loud compared to supersonic gas escapement.
The frequency of the sound from the bore can be calculated. http://en.wikipedia.org/wiki/Helmholtz_resonance When I lower the muzzle pressure to below 1 atmosphere above ambient by reducing powder charge, instead of a loud bang, I then get three sounds; the firing pin, the muzzle and the target being hit. Even under these conditions, air rushing in may not be audible, as the cooling of powder gases in the bore has a fall time slower than the resonance [will do a poor job of exciting it].
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March 1, 2015, 08:05 AM | #29 |
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The sound of a pressure vessel containing up to 55.000 psi getting uncorked when the bullet leaves the muzzle makes noise.
Has nothing to do with the bullet passing thru the air and it collapsing back into it's trail. When you are downrange and hear the sonic crack of the bullet passing overhead, consider the report of the barrel coming split seconds later isn't caused by it. Operating a suppressed weapon should be even more informative - the action clanks as it cycles, same as loading it for the first shot. And the bullet passing makes its own noise, the suppressor just knocks down the huge volume of high pressure gas as it escapes. That's why we have mufflers on cars - suppresses the report of the cylinder opening and the high pressure gas escaping. It doesn't suppress the sound of the tires on the road, or the power steering pump whining. A suppressor on a firearm doesn't quiet down the boots of the guy carrying it or the action cycling. Just the report of a small volume of explosive. |
March 1, 2015, 09:25 AM | #30 | |
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March 1, 2015, 10:32 AM | #31 | |
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With a 20" barrel, it's down to around 10,000 psi or so in .223. There's a reason why barrels are thickest around the chamber.
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March 2, 2015, 03:51 AM | #32 |
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Nonsense my ass. That is why so many people get hit by trains. You don't hear them coming. What do YOU think makes the snapping noise of a bullet passing? I can delete that noise from a well designed suppressed weapon just by running ammo that is traveling below the speed of sound. People are confusing two different sources of noise here. You can eliminate the the initial explosion of the round going off by slowing down the expanding gasses. The snap of a bullet can only be eliminated the same way, by slowing it down, unless there have been some radical new discoveries in the last 30 years.
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March 2, 2015, 09:48 AM | #33 | |
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Trains don't depend on principals of flight, nor do they travel supersonically. If you ever ride a mach 1+ flying train your example might be valid. Most who get struck by trains are distracted & don't hear, or feel the vibration of them coming. What you hear is the high pressure pulse from the leading edge(s) of the fuselage & wings, depending on design it may be 1, 2, or 3 pulses very close together. If there were a vacuum there would be no pressure differential over the upper & lower aerofoil surfaces, no lift & the plane would drop like a brick instantly.
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March 2, 2015, 12:26 PM | #34 | |
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People get hit by trains for many reasons: some intentionally, some because because they are not paying attention/are intoxicated ..... they may not hear it over their blaring streo because much of the noise of a train emanates from under the train/behind the locomotives and is shielded from a listener ahead of it, and because the trains are moving faster than the person in front of the trains think they are, and they think they can "beat the train" across the crossing ...... in no case does the train outrun the sound it makes. |
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