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Semi-Auto (or Full Auto?) Piston Valve

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 09, 2007 5:35 am

There's a lot of flow rates to balance in this equation, getting it right could take some trial and error.

I used a similar system in my cartridge fed pneumatic prototype:

Image

Even though the filling hole was tiny, air still leaked through the barrel as the piston didn't reseal properly. I had to restrict the filling supply to tiny levels for the pilot volume to pressurise. A less tight fitting piston and larger chamber would probably have solved the problem, but being epoxy construction, not that easy to fiddle with the internals once you've built it.
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Unread postAuthor: Novacastrian » Fri Nov 09, 2007 5:42 am

Damn that would be annoying you damned sadist Refers to current avatar. The fact you cannot fiddle would suck. I like your design very much and give kudos to anyone with the balls to build one :D
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 09, 2007 5:46 am

If you mean the above design, then I built it already :p check the link.

The avatar's from chopping block, dark humour but very funny :D
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Unread postAuthor: Novacastrian » Fri Nov 09, 2007 6:00 am

jackssmirkingrevenge wrote:If you mean the above design, then I built it already :p check the link.

The avatar's from chopping block, dark humour but very funny :D


Rather i was wrong- that is funny stuff :D
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America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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Unread postAuthor: Novacastrian » Tue Nov 13, 2007 3:33 am

I wonder if 2600psi of dry nitrogen will help :twisted: :twisted:
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America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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