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software chronograph

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software chronograph

Unread postAuthor: hyldgaard » Thu Nov 08, 2007 12:14 pm

Hi, found this on a Danish airgun forum and thought of you guys ;)
It's a program that allow you to use your computer as a chrono. You place your computer excactly between your target and your muzzle, start the program, and fire. The program calculates your projectile speed at the muzzle from the sound. i havent personally tried this yet, but i have of several peple that have had good experience with this.
Enjoy :D
http://talonairgun.com/softchrono/SoftChrono_beta1.ZIP
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Unread postAuthor: LikimysCrotchus5 » Thu Nov 08, 2007 2:58 pm

very nice!!!
I tried it with clapping my hands and it worked. Lucky for me i have a laptop so i can take it outside and try it. This is such a great help. Thx 8)
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Unread postAuthor: hyldgaard » Thu Nov 08, 2007 4:02 pm

Yea, didnt really think about those who doesnt have a laptop :oops: but i think you get the idea with the microphone instead of the pc :D
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Unread postAuthor: Maniac » Thu Nov 08, 2007 4:37 pm

would suck if you misfired Image
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 08, 2007 5:39 pm

Interesting, as soon as i find my *profanities* microphone i'll try it and compare with my "proper" chrony.
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Unread postAuthor: LikimysCrotchus5 » Thu Nov 08, 2007 6:09 pm

i tried it and these are my results:
All shots made at 100 psi
Using my recently built 1.5 inch tee piston valve cannon 3/4 inch barrel
and it has a small leak were i put in the guage, gotta epoxy that better :D
Ammo: Paintball

First Shot with soft crono:
Muzzle Trigger: 1074.90 ms
Impact Trigger: 1197.8 fps

2nd shot with soft crono:
Muzzle trigger: 1131.43 ms
Impact Trigger: 1200 fps

If you want to see my gun CLICK THIS

P.S. Yay 200 posts 8) :D :oops: :P :? :D :) :( :roll: :idea: :evil:
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Unread postAuthor: clide » Thu Nov 08, 2007 9:17 pm

LikimysCrotchus5 wrote:First Shot with soft crono:
Muzzle Trigger: 1074.90 ms
Impact Trigger: 1197.8 fps

2nd shot with soft crono:
Muzzle trigger: 1131.43 ms
Impact Trigger: 1200 fps


I'm not sure how long your barrel is, but I can say that those numbers are probably not correct. Either you have a setting wrong or the program is picking up an echo.
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Unread postAuthor: DYI » Thu Nov 08, 2007 9:28 pm

I don't know how well a paintball would fare if it broke Mach 1, but I'm pretty sure that at low pressures with a gun small enough to hold you won't be breaking the speed of sound with a 5 gram projectile.
*Cue Jack finding obscure example and proving me wrong in <20 minutes*
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Unread postAuthor: Ragnarok » Thu Nov 08, 2007 9:50 pm

DYI wrote:I don't know how well a paintball would fare if it broke Mach 1, but I'm pretty sure that at low pressures with a gun small enough to hold you won't be breaking the speed of sound with a 5 gram projectile.

I use 320 psi, 4' of barrel, and still I can't put a paintball past the sound barrier with HEAL - though not for lack of trying.
Maybe if I keep persisting, I'll get a fluke sonic boom.

I too would be interested to see how a 100 psi cannon has me beat by nearly 200 fps. Was the target-muzzle distance set correctly?

P.S: Yay! 19 years of age! :wav: w00t! Well, at least on GMT. But as I was born in the UK, I don't think I need to be using US time for determining my age, do you?
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Unread postAuthor: Thursto » Thu Nov 08, 2007 10:06 pm

Hey this program is great, i just used it, placed my laptop in the middle, pumped my gun up to 20psi (not alot i was in my room) and shot a nerf dart, and it says it shot at around 900fps or something, is that right??? i got a video of me doing it, so you can check it out, just need to upload it, and also ill get some more.

Cheers thursto
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Unread postAuthor: Ragnarok » Thu Nov 08, 2007 10:09 pm

At 20 psi? - not a chance, it's physically impossible to go that fast at 20 psi because of back pressure forming ahead of the projectile.

Did you set the target - muzzle distance? It'll just give you garbage (as per GIGO - garbage in, Garbage out) if you don't.
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Unread postAuthor: Thursto » Thu Nov 08, 2007 10:14 pm

How do u set muzzle distance? and is that from he tip of your barrel to the computer???
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Unread postAuthor: Ragnarok » Thu Nov 08, 2007 10:18 pm

Muzzle to target distance, it's one of the options on the settings menu. It's set default to 40 yards, so if you're only firing over 12 feet or so, then the numbers will be a factor of 10 too big.
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Unread postAuthor: LikimysCrotchus5 » Thu Nov 08, 2007 10:22 pm

Yea thats what i was thinking when i saw my results. I was thinking that they were definately wrong so i knew it was wrong but i posted it just to show you guys how accurate this was. I could have picked up an echo i believe. How do you set the muzzle distance??
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Unread postAuthor: Ragnarok » Thu Nov 08, 2007 10:40 pm

Ok, again for people who don't want to use their initiative - setting button, then top of the left hand column of inputs on the bit that pops out is the target distance.

You can also mess with the other settings to get kinetic energy, correct for drag, etc, etc. I'd also suggest turning the maximum velocity setting down to a more likely number so that it can discard possible results that are too high to be correct. Setting the volumes for impact and muzzle would also help, but that's probably going into the realms of an over complication- still, if you can work it out and set it, it'll work better.

The software might be good, but if you're not prepared to give it the right information to work with, it's useless.
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