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best ratio for a ball valve gun

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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best ratio for a ball valve gun

Unread postAuthor: spudzooka98 » Fri May 17, 2013 7:59 pm

hello im making a pneumatic gun its going to be on the smaller side but i need to know a good ratio for a ball valve please no "dont use a ball valve" its all i got its hard to get things when your young and parents dont understand your passion for spud guns but the barrel is 24 inches of 3/4 pvc what do you guys think will be most effective thanks
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Unread postAuthor: Zeus » Fri May 17, 2013 8:12 pm

Between 1:1 and 2:1, really doesn't matter.

I'm sure a handful of 1" fittings and a 1/2" ball valve wouldn't be hard to get, then you've pretty much got a piston valve.
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/sarcasm, /hyperbole
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Unread postAuthor: spudzooka98 » Sat May 18, 2013 5:53 am

can you explain the piston valve
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Unread postAuthor: Technician1002 » Sat May 18, 2013 11:04 am

Part of the ratio would be influenced by the choice of projectile. Due to the slower speed of the valve, they work best with larger heavier projectiles. If your projectile fits well and seals the barrel, you can use a smaller chamber. If your projectile is loose fitting, such as a soda can launcher, then to compensate for air lost to blow by, a larger chamber is recommended.
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Unread postAuthor: jsefcik » Sat May 18, 2013 11:22 am

spudzooka98 wrote:can you explain the piston valve



look in the wiki =)
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Unread postAuthor: spudzooka98 » Sat May 18, 2013 6:54 pm

im lookin it up in wiki right now :) also should the camber diameter be larger that 3/4 inch or is that fine
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Unread postAuthor: ramses » Sat May 18, 2013 10:10 pm

If possibly the chamber of the launcher should be high pressure low volume. That will allow a higher mass flow rate through the partially open ball valve (greater density at the same speed and area). Light projectiles will be more significantly affected

As to explaining the piston valve, there is a STICKY in the pneumatic cannon discussion section called 'piston valves explained visually' I will not link to it on principal.

You will find that people are much more willing to help you when the answer to your question is literally on the page you visited to ask it.

Should you try to use the search, there is another sticky that explains how to do so effectively. The quick search at the top of the page is just total crap.
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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
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Unread postAuthor: spudzooka98 » Sun May 19, 2013 8:21 am

thanks yeah ill look for that thread and yes i know how to use the search but it keeps saying cant search so soon after the other one or something like that and what do you think of wrapping the gun with camo duct tape
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