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-   -   Cheap chrono (https://airsoftcanada.com/showthread.php?t=26979)

bluetooth August 3rd, 2006 09:16

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

vatek August 3rd, 2006 10:10

That's about average cost for a chrono, not really cheap.

Sgt_Lynch August 3rd, 2006 10:28

Thats $US and not available in Canada BTW. So, not much of a deal.

bluetooth August 3rd, 2006 10:43

sorry i guess the ones i see are really expensive ones

RecceGod August 3rd, 2006 11:49

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...

Sgt_Lynch August 3rd, 2006 13:38

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:

thephenom August 4th, 2006 01:35

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)

Dustball August 4th, 2006 04:01

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.

Sgt_Lynch August 4th, 2006 05:36

Pfft, I just shoot my cat... the higher it jumps the more velocity I've got.

RecceGod August 4th, 2006 10:27

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

Luckyorwhat August 6th, 2006 13:20

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.

[Lithium] August 6th, 2006 15:09

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.

bluetooth August 6th, 2006 15:27

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.:(

Dustball August 6th, 2006 16:48

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.

Dark-Angel August 6th, 2006 17:27

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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