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A Quick Question to do with barrel length.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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A Quick Question to do with barrel length.

Unread postAuthor: Thursto » Tue Jan 15, 2008 10:28 pm

Well i just got a quick queston and im looking for a quick answer before i head down to my local hardware store. Im building a cannon mainly out of spare parts, all i needa buy is 2 3/4" Elbows,it will be a ball valve witch will be 3/4" also. The chamber is 2" approx 25cm long and the barrel will be 40mm, im looking to keep the gun small and portable, so what would be the ideal barrel length? my plan was not to exceed 60cm, it will be an under over design.

Here is a Quick paint drawing.
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Double Barrel Shotgun style or Table Tennis ball gun interchangable barrels.jpg
Double Barrel Shotgun style or Table Tennis ball gun interchangable barrels.jpg (20.8 KiB) Viewed 306 times
Last edited by Thursto on Wed Jan 16, 2008 5:31 am, edited 1 time in total.
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Unread postAuthor: hi » Tue Jan 15, 2008 10:40 pm

looks fine to me. i would go for about 40 inches, but thats just me. (im not exactly sure of the conversion of cm to inches, but thats reasonably close isnt it?)
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Unread postAuthor: Thursto » Tue Jan 15, 2008 10:42 pm

Well 12 inhes is 30cm right? or close enough so that would make it like around 1m?

Im thinking of around 60-80cm max
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Unread postAuthor: LikimysCrotchus5 » Wed Jan 16, 2008 12:16 am

Yes your are correct.

Id just say as big as you can go with the portability.
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 16, 2008 12:17 am

LikimysCrotchus5 wrote:I'd just say as big as you can go with the portability.


Agreed, but why a ball valve?
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Unread postAuthor: Thursto » Wed Jan 16, 2008 4:28 am

jackssmirkingrevenge wrote:
LikimysCrotchus5 wrote:I'd just say as big as you can go with the portability.


Agreed, but why a ball valve?


1. Because it is cheap and easy (no modding sprinkler valve)
2. Piston is out of the equation
3. Because i had it spare

this gun is going to be mainly a spare parts cannon
its all done, just waiting for glue to dry and adding some minor mods and accesories etc. The barrel will be 50cm long and i hae a 1m barrel to.

Later on i am planing on making it like a double barrel shotgun, (i no performence will be poor, and the air wont split properlyt etc)

Thanks for all the hep, Thursto.
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Unread postAuthor: Carlman » Wed Jan 16, 2008 5:17 am

Thursto wrote:...all i needa buy is 2 3/4" Elbows and a ball valve...


Thursto wrote:3. Because i had it spare


ermm is it just me or...
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Unread postAuthor: Thursto » Wed Jan 16, 2008 5:30 am

ahh i found iit in the shed like 5 mins after i posted that, sorry ill edit it out in a min. Thanks for pointing that out.
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Unread postAuthor: Carlman » Wed Jan 16, 2008 7:18 am

lol anytime mate
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