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Old August 3rd, 2006, 09:16   #1
bluetooth
 
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Cheap chrono

I found this cheap chrono on the walmart sight while looking for a scope for my airsoft gun. Take a look http://www.walmart.com/catalog/produ...uct_id=4382669
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Old August 3rd, 2006, 10:10   #2
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That's about average cost for a chrono, not really cheap.
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Old August 3rd, 2006, 10:28   #3
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Thats $US and not available in Canada BTW. So, not much of a deal.
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Old August 3rd, 2006, 10:43   #4
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sorry i guess the ones i see are really expensive ones
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Old August 3rd, 2006, 11:49   #5
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Quote:
Originally Posted by Sgt_Lynch
Thats $US and not available in Canada BTW. So, not much of a deal.

I beg to differ:

http://www.shootingchrony.com/order_DJCAN.htm

104$ at LeBaron.

unless you were referring to Wal-Mart, in wich case I take it back...
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Old August 3rd, 2006, 13:38   #6
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Quote:
Originally Posted by RecceGod

I beg to differ:

http://www.shootingchrony.com/order_DJCAN.htm

104$ at LeBaron.

unless you were referring to Wal-Mart, in wich case I take it back...
I ment the link he provided at Walmart.. I know you can get chronys in Canada... :xmas:
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Old August 4th, 2006, 01:35   #7
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The pop can test (which isn't accurate) or use the computer with 2 mics is a cheap chrono. (you can search this one up)
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Old August 4th, 2006, 04:01   #8
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you don't need 2 mics, one will work fine, just mesure your shooting distance, and the amount of time between the sound of the gun firing, and the sound of the projectile hitting your target and do some math, and you then have your average velocity for that shooting range, but you won't have the actual muzzle velocity.

If you want to be really precise you would have to factor in the placement of your microphone, and the speed of sound at your locations altitude.

or you could get 2 microphones, and have one record the sound of the gun, and the other record the sound of the projectile hitting the target, then record the time beween each noise. and the closer the microphone is to the target and the gun the better.
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Old August 4th, 2006, 05:36   #9
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Pfft, I just shoot my cat... the higher it jumps the more velocity I've got.
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Old August 4th, 2006, 10:27   #10
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Quote:
Originally Posted by Sgt_Lynch

I ment the link he provided at Walmart.. I know you can get chronys in Canada... :xmas:
That's what I thought... no worries
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Old August 6th, 2006, 13:20   #11
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Quote:
Originally Posted by Shotgun-MAn
you don't need 2 mics, one will work fine, just mesure your shooting distance, and the amount of time between the sound of the gun firing, and the sound of the projectile hitting your target and do some math, and you then have your average velocity for that shooting range, but you won't have the actual muzzle velocity.

If you want to be really precise you would have to factor in the placement of your microphone, and the speed of sound at your locations altitude.
You know what's wierd? I've always understood that sound is faster at higher altitudes, too. Because that's why skydiver's couldn't break the sound barrier, not even NASA guys testing high-altitude ejections, because they'd fall fast being in the thin air, but sound was even faster because of the thin air.

But I checked Wikipedia just now to confirm, and it says altitude has no effect on Vsound, per se. Pressure and density are irrelevant, all that matters is temperature (which will be lower higher up).

Anyone else heard this, or have independent confirmation, Wiki is good, but not infallible.
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Old August 6th, 2006, 15:09   #12
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all i heard was that skydivers, and anyone else falling from greats falls gaining speed until they reach maximum velocity... one hundred and thirty something miles per hour i believe it was, but not sure. once something reachs that speed it doesnt go faster, and doesnt go slower nless something like a parachute...or the ground makes it. If i recal this is also the reasoning behind why everything fallas at the same rate.
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Old August 6th, 2006, 15:27   #13
bluetooth
 
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http://www.seattleairsoft.com/module...ryid=15&page=1 this is the link to the mic chrono. I just set everything up to do it and realized i dont have an audio splitter.
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Old August 6th, 2006, 16:48   #14
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Read my post, and then you'll see that you only need 1 mic. Also download a program called Audacity, it's very simple and easy to use.
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Old August 6th, 2006, 17:27   #15
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the thing about skydivers never reaching the speed of sound is simple, each thing has a terminal velocity witch is base on weight shape.... cause air creats a resistance witch is why stuff reaches a maximume speed and cant go faster, so each thing has diffrent maximume speed.
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