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semi-valveless design

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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How well will it work?

it wont
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ok
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good
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Total votes : 6
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semi-valveless design

Unread postAuthor: FishBoy » Tue Oct 07, 2008 3:48 pm

this is just a theory that's been floating around in my head for a while. A valve on th end of the barrel is opened and the unrestricted air flow fires the projectile.
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Unread postAuthor: Ragnarok » Tue Oct 07, 2008 3:50 pm

Unfortunately flawed.

Not only will it's power be limited (because for a considerable time, there will be pressure on both sides of the projectile, resulting in lower net force) but if the ball valve isn't opened very sharpish and cleanly, the projectile is just going to smash into it.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 07, 2008 3:52 pm

Ragnarok wrote:if the ball valve isn't opened very sharpish and cleanly, the projectile is just going to smash into it.


...et voila, from semi-valveless to fully valveless :D yay!
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Unread postAuthor: FishBoy » Tue Oct 07, 2008 4:08 pm

could a spring loaded ball valve fix this?

edit- &/or a longer barrel (& proprtionately larger chamber)
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 07, 2008 4:12 pm

It will be worse than if you put the ball valve between the barrel in the chamber, unfortunately the concept is fundamentally flawed.
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Unread postAuthor: jonnyboy » Tue Oct 07, 2008 5:15 pm

How is this different then having the ball valve before the barrel?
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Unread postAuthor: jook13 » Tue Oct 07, 2008 6:10 pm

because you start out with pressure on both sides of the projectile. I just cant imagine it not slowing the ammo down a bit.
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Unread postAuthor: Atlantis » Tue Oct 07, 2008 6:36 pm

Already suggested this idea, ya gotta remember that Ball Valves have a smaller inner diameter as well. The idea works, it's just not useful.
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Unread postAuthor: Lentamentalisk » Tue Oct 07, 2008 6:40 pm

plus, I would imagine it would be nearly impossible to pressureize it with out the projectile traveling at least half of the barrel length, due to the slight pressure buildup behind it...
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Unread postAuthor: psycix » Wed Oct 08, 2008 10:15 am

This should be possible in some way. But then instead I would use a burst disk, which could also be placed behind the projectile but then it wont be a semi-valveless again.
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