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chamber to barrel ratio question

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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Unread postAuthor: Sergeant Dotson » Sun Apr 06, 2008 1:31 pm

That valve should be fine, you could use that in the low hundreds, (200 or less PSI.)
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Unread postAuthor: jrrdw » Sun Apr 06, 2008 1:35 pm

D_Hall wrote:Talk all you want of barrel/chamber ratios... Your biggest improvement at this point would come from ditching that ball valve and getting something faster. The standard "quick and easy for the beginner that still works well" valve is the modified sprinkler valve.

Use the search feature of the board, there should be PLENTY of information available.


Good catch, good point!
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Unread postAuthor: Sergeant Dotson » Sun Apr 06, 2008 1:39 pm

Well guys, that might be a good point but almost all of us started with a ball valve. This is his first so give him a break.
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Unread postAuthor: SpudFarm » Sun Apr 06, 2008 1:41 pm

i started with copper and ball valve and now 4 years later i am about to build a 471ci hybrid :D

times change!


you can make a piston valve.
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Unread postAuthor: beans » Sun Apr 06, 2008 1:43 pm

thanks dotson, I actually wanted to have a QEV to begin with, but couldn't find one anywhere...or didn't know what I was looking for...I wanted it done the second I got the idea to make it, so I got all my materials in the morning, was shooting by noon.
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Unread postAuthor: jrrdw » Sun Apr 06, 2008 1:44 pm

My 1st was 2 tennis ball canisters duck taped together, made it about 30 years ago.
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Unread postAuthor: D_Hall » Sun Apr 06, 2008 1:44 pm

beans wrote:I'm looking to get a QEV, but I don't know from where....mcmaster has them, but I can't find them on their site...

Yeah, I saw your other thread after I responded to this one. QEV = better than sprinkler valve.
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Unread postAuthor: beans » Sun Apr 06, 2008 2:10 pm

another question is how do I add a gauge to the cannon? more specifically, what's the easiest and cheapest way to add a gauge?
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Unread postAuthor: beans » Sun Apr 06, 2008 5:24 pm

here, so you guys can get a visual on what I made...it's standing about 8 feet tall... maybe 9 feet...

http://farm4.static.flickr.com/3195/239 ... 62f6_b.jpg
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Unread postAuthor: SpudFarm » Sun Apr 06, 2008 6:39 pm

D_Hall wrote:
beans wrote:I'm looking to get a QEV, but I don't know from where....mcmaster has them, but I can't find them on their site...

Yeah, I saw your other thread after I responded to this one. QEV = better than sprinkler valve.


on a 1" barrel a 1" sprinkler is better than a 3/4" QEY.
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