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SpudFiles Forum Index » Non-Spudgun Related Discussion » GCR rifle

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GCR rifle

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Holland_Charley

Posted: 05/03/2006 4:53 AM Post subject:

Private

Joined: 01 May 2006
Posts: 18
43.81 Spud Bux

Made a new barrel today 12 mm diameter still dont know if im goign 2 use it for this one or for another one. Im scared the presure will be 2 big for an 12mm diameter barrel look for my combustion chamber volume on the top of the topic.

greets

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Benny

Posted: 05/03/2006 5:08 AM Post subject:

Brigadier General

Joined: 19 Apr 2006
Posts: 845
144.97 Spud Bux

the pressure definatly wont be too much, combustions only make 20-50 psi.

Holland_Charley

Posted: 05/03/2006 10:58 AM Post subject:

Private

Joined: 01 May 2006
Posts: 18
43.81 Spud Bux

Thanks man Cool

i always thougt iw would blow Twisted Evil

with a tine barrel

Holland_Charley

Posted: 05/05/2006 14:48 PM Post subject:

Private

Joined: 01 May 2006
Posts: 18
43.81 Spud Bux

Yo should i use pure butane or butane from hairpray?

greet Charley

Shrimphead

Posted: 05/05/2006 16:56 PM Post subject:

Colonel

Joined: 17 Nov 2005
Posts: 514
667.65 Spud Bux

Don't use hairspray. It gums your chamber up. Smaller diameter pipe can usually hold more pressure.

Brian the brain

Posted: 05/05/2006 23:37 PM Post subject:

Dutch Spud Clan Leader
Major General

Joined: 05 Dec 2005
Posts: 1314
2165.94 Spud Bux

I've put 22 bar on a 12 mm copper pipe.Not that you should but the smaller the diameter the stronger it is.Less surface area for the air to push on.No combustion chamber is gonna blow that barrel up.

Since you use all metal you could try starter fluid.(starter spray bij de halfords)

SpudStuff

Posted: 05/05/2006 23:46 PM Post subject:

Major General

Joined: 10 Dec 2005
Posts: 1379
128.17 Spud Bux

that wont be a very powerful combustion because the C:B ratio is way off

Holland_Charley

Posted: 05/08/2006 10:33 AM Post subject:

Private

Joined: 01 May 2006
Posts: 18
43.81 Spud Bux

the C:B ratio is much much biger than an normal spud gun so with some pure oxygen in combination with:

butane
Ether

it is kinda powerfull, with hairspray the projectiles often comes 20- 40 meter away with a ugly parabole. But im working on better fuels so stay tuned.

-greetz Charley

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