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5'' wide by 30'' high cannon to strong for 44mm ID barrel

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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5'' wide by 30'' high cannon to strong for 44mm ID barrel

Unread postAuthor: |daevic| » Tue Jul 14, 2009 9:45 am

Hi

What diameter barrel would be good with my 9 liter chamber?
When i shoot with 44mm ID barrel my lid explodes into 1000 pieces.

greets
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Unread postAuthor: Ragnarok » Tue Jul 14, 2009 11:57 am

None, you shouldn't even be using it (with any barrel size) if it does that. The safety margins are obviously either non-existent or far too narrow to be acceptable.

You'll need to build a new chamber I'm afraid, out of much stronger materials.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jimmy101 » Tue Jul 14, 2009 1:22 pm

Lik Ragnarok said, whatever you built this gun out of is not suitable.

What did you use? Pressure rated PVC, if properly glued, will handle any standard combustion scenario even if the barrel is pluged. ("standard combustion scenario"= simple fuel like methane, propane, butane, gasoline, alcohol, ... at 1 ATM pressure).

What exactly is you "lid"? A threaded cleanout plug, even if it isn't pressure rated, will survive a closed chamber combustion up to at least 4" diamter.
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Unread postAuthor: THUNDERLORD » Tue Jul 14, 2009 3:24 pm

...simple fuel like methane, propane, butane, gasoline, alcohol,...


Methane... 'OlPoOP gAs ehh??? :shock: :P :lol:

Wish I got more views/ replies on that one. :(
My PoOP thread... :cry: ... :P

What is a 9 liter bottle???
Must be European or somethin' ???
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Unread postAuthor: |daevic| » Tue Jul 14, 2009 4:14 pm

I live in Europa yes. I think we dont have PVC strong enough for spudguns.
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