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High pressure co-axial build log- updated 11/14/08

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: far_cry » Wed Aug 27, 2008 6:22 am

gippeto
i know that air can go outside with thes high pressures from the littelest holes but liquids is not
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Unread postAuthor: Gippeto » Wed Aug 27, 2008 8:51 am

True enough, but I am missing your point.

Please, feel free to expand on your comment. :)
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Unread postAuthor: far_cry » Wed Aug 27, 2008 12:26 pm

i mean if you can get 6000 psi hpa in this monster you make . will be some leaks ?
sorry for my bad english i am from israel
and did you see my pump that i maked ? thanks to you sure
:twisted: and you will love the replacement of the O ring thing :twisted:
http://www.spudfiles.com/forums/viewtopic,p,206181.html#206181
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Unread postAuthor: Gippeto » Wed Aug 27, 2008 1:29 pm

To be totally honest, as I have not tested it past 1000psi with a gas of any sort, ... I don't know. It should not leak.

The design uses quad rings to seal the larger pieces, and now uses a teflon seal on the valve stem.

With increasing pressures, the seals actually "seal better". :)

I do KNOW that my new valve stem and the quad rings do not leak at 850psi. (room temp CO2) :D

The highest pressurized air that is available to me currently is 4500psi. I have yet to purchase a tank though.

Otherwise, I can get nitrogen at up to 6000psi locally. A really nice alternative as it will actually increase performance without increasing pressure.

These options WILL require a regulator, as I have no intention of using more than the 3000psi originally planned for.

Helium is also being considered.


Your english is not a problem. :)

I will suggest that you expand on your comments so that people get a better idea of what you are trying to say.
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Unread postAuthor: DYI » Wed Aug 27, 2008 10:30 pm

These options WILL require a regulator, as I have no intention of using more than the 3000psi originally planned for.

Helium is also being considered.


No, they WILL require a way to reduce the pressure. Do you have any idea how ludicrously expensive a regulator that could output 3kpsi anything would be? I'd suggest an adaptor and needle valve, you could probably cut costs by at least 75%, maybe more, compared to a reg.

Helium would certainly cause an improvement in performance, but would you have enough pressure to make it worthwhile? I suppose that with lighter saboted rounds, it'd make all the difference.

Best of luck with this, I hope that it doesn't develop any leaks at higher pressure (although I can almost guarantee that it will leak to some appreciable extent with helium).
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Unread postAuthor: Gippeto » Wed Aug 27, 2008 11:17 pm

I do not believe that shot to shot consistency can be achieved with a needle valve set up. This will be necessary for accuracy.

I will need a regulator.

As you mention, the cost of such a device would be "ludicrous". :(

Unless I build it myself. :)
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Unread postAuthor: far_cry » Thu Aug 28, 2008 9:00 am

4500 psi hpa
where you can get high pressure like this ?? air compressor thate fill diving bottle
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Unread postAuthor: Gippeto » Thu Aug 28, 2008 1:59 pm

Yes. :)
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Unread postAuthor: dilweed » Mon Oct 06, 2008 1:39 pm

Congradulations, You are now a spudfile equivalent to a celebrity! All bow down to the allmighty Gippeto!
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Unread postAuthor: Gippeto » Mon Oct 06, 2008 1:53 pm

I rather doubt that.
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Unread postAuthor: dilweed » Mon Oct 06, 2008 2:24 pm

dilweed wrote:Congradulations, You are now a spudfile equivalent to a celebrity! All bow down to the allmighty Gippeto!


It was a compliment! Your gun is awesome, but i'd make only one change. MAKE A WOODEN STOCK. It would look amzing. Carve, it dye, it, and you will have not only a really powerfull launcher, but also a beautifull piece of art. Dam, im so jealous. I relly wish I had the tools to make something like that. Sigh-
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Unread postAuthor: far_cry » Sat Dec 06, 2008 7:54 am

hi gippeto
how are you

fainly you finish the project
time to see some action
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Unread postAuthor: Gippeto » Sat Dec 06, 2008 1:03 pm

It shouldn't be too long now. :D
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Unread postAuthor: ALIHISGREAT » Sat Dec 06, 2008 1:06 pm

Gippeto wrote:It shouldn't be too long now. :D


any teaser pics? i've been waiting to see this beast completed for ages :(
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Unread postAuthor: mark.f » Sat Dec 06, 2008 1:09 pm

I too, demand teasers.

Do not enanger me.
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