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Barrel lengths Questions

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Barrel lengths Questions

Unread postAuthor: jsefcik » Thu Jul 28, 2011 10:31 pm

I have an air cannon with mutiple barrels that i want to make how long should the following barrels be( my air chamber is 14 inches)

1/2 inch copper pipe
1/2 inch pvc sch40
1 inch pvc sch 40
3/4 pvc sch40
1 1/2 pvc sdr 21
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Unread postAuthor: Gun Freak » Thu Jul 28, 2011 10:33 pm

Longer the barrel, better velocity. Just don't make it rediculously long like 20 feet lol
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Unread postAuthor: jsefcik » Thu Jul 28, 2011 10:35 pm

Would 4-5 feet be good?

but for my golf ball barrel i have 36 inches, which works great
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Unread postAuthor: Gun Freak » Thu Jul 28, 2011 10:41 pm

Yeah play around with ggdt
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Unread postAuthor: jsefcik » Thu Jul 28, 2011 10:50 pm

Gun Freak wrote:Yeah play around with ggdt


wont work on my computer
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Unread postAuthor: Technician1002 » Thu Jul 28, 2011 10:51 pm

The optimum barrel length will vary. Items such as projectile weight, valve size, chamber size, and pressure will all need considered in finding the best barrel length for your launcher.

As mentioned in the above thread, install GGDT and work with the numbers.

It is possible to have a barrel too long so the projectile will slow down before reaching the muzzle. Long barrels are best supported by larger chamber volumes and high flow valves. Smaller chambers, and high pressure support shorter barrels. Large low pressure chambers with a high flow valve work best with longer barrels.
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Unread postAuthor: Mr.Tallahassee » Thu Jul 28, 2011 10:57 pm

wont work on my computer
I think he has a Mac. GGDT won't work on a Mac.
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Unread postAuthor: jsefcik » Thu Jul 28, 2011 11:17 pm

I have a toshiba, i tried downloading it, all it does is extract the files about 20 times and nothing happens, wish it did work
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Unread postAuthor: MrCrowley » Thu Jul 28, 2011 11:25 pm

Have you tried running it as administrator (right click on the .exe, click 'run as administrator')?
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Unread postAuthor: jsefcik » Fri Jul 29, 2011 12:03 am

MrCrowley wrote:Have you tried running it as administrator (right click on the .exe, click 'run as administrator')?


What ?

All i see is languages, COMDLG32,COMDLG32.OCX, example gdt,ggdt4.6,MSCHRT20,MSCHRT20OCX, that is all i get when i open the file and if i click anything it says extract files and just gives me what the beginning file says idk what to do
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Unread postAuthor: Mr.Tallahassee » Fri Jul 29, 2011 12:08 am

Try to run it without extracting. I did that to make sure it was a successful download. Open "ggdt4.6". It should be an .exe file.
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Unread postAuthor: jsefcik » Fri Jul 29, 2011 12:13 am

Ohh ok i found how to run as adminstator, My mom isnt awake for the passwords ill have to try tomorrow when she is awake

Once i open it will i get what i see on the website?

Thanks guys=)

No one answered my questions though
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Last edited by jsefcik on Fri Jul 29, 2011 12:22 am, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Fri Jul 29, 2011 12:21 am

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Unread postAuthor: Crna Legija » Fri Jul 29, 2011 1:21 am

jsefcik wrote:I have a toshiba, i tried downloading it, all it does is extract the files about 20 times and nothing happens, wish it did work



O RLY (pic incoming)

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Unread postAuthor: jsefcik » Fri Jul 29, 2011 9:46 pm

That ggdt thing is so dam complicated
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