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

[far_cry]

gippeto
i know that air can go outside with thes high pressures from the littelest holes but liquids is not

[Gippeto]

True enough, but I am missing your point.

Please, feel free to expand on your comment.

[far_cry]

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
and you will love the replacement of the O ring thing
http://www.spudfiles.com/forums/viewtop ... tml#206181

[Gippeto]

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)

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.

[DYI]

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).

[Gippeto]

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.

[far_cry]

4500 psi hpa
where you can get high pressure like this ?? air compressor thate fill diving bottle

[Gippeto]

Yes.

[dilweed]

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

[Gippeto]

I rather doubt that.

[dilweed]

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-

[far_cry]

hi gippeto
how are you

fainly you finish the project
time to see some action

[Gippeto]

It shouldn't be too long now.

[ALIHISGREAT]

It shouldn't be too long now.

any teaser pics? i've been waiting to see this beast completed for ages

[mark.f]

I too, demand teasers.

Do not enanger me.