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Need suggestions for top shelf combustion

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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Unread postAuthor: Maniac » Fri Jun 13, 2008 7:53 pm

Amen!


I know what you mean. Foe inter changeable barrel try to use cam locks the serve as breech loading and a small burst disk holder. It maybe harder to find cam locks for a 4in barrel which are so much fun (friend just got one, been shooting softballs, I see why pitbull loves em so much) but I have seen them for 4in pipe before so they are out there.
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Unread postAuthor: DYI » Fri Jun 13, 2008 9:24 pm

Geez guys, where's your creativity?

You don't need to buy fittings! Why would you for a gun that won't even be generating over 90psi or so? Cast your own caps and reducers out of fiberglass.

Get the longest chunk of the biggest pipe you can find to use as the chamber, and then reduce down to 8" so that your ammo doesn't weigh hundreds of pounds.

Inline will make for more power, and it doesn't seem as though high portability is a priority here. It also means much less complex fiberglass castings.

As for ammo, cast ice or concrete always works, or shotgun type loads of vegetables with towels for wadding.
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Re: Need suggestions for top shelf combustion

Unread postAuthor: starman » Sun Jun 15, 2008 9:40 am

spudmatic wrote: And starman I realize that the bell reducer is a bad idea but it is very hard to find fitting for bigger pipes especially pressure rated. I looked into 6in and found the stuff I would need but, the 90 degree elbows would cost me about $30 a piece :cry: .


That bell reducer you linked to is a 5" to 4" model. 5" is a nonstandard size for pressure rated PVC. This part is useless for what you are looking to build.

6" is your next practical size up from 4" if you are really looking to go big. Are you sure you are ready to deal with the logistics and costs of building, transporting, mounting, and fueling such a beast?
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Unread postAuthor: spudmatic » Sun Jun 22, 2008 9:39 pm

Sorry I waited so long to reply guys my computer crashed :cry: . Flone and maniac I am going to take both those suggestions into consideration. And starman this is going to be a slow build not a buy everything at once. And finally DYI were you being sarcastic with that post?
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The definition of spudcannon should include combustion, if I wanted to shoot a pneumatic I'd go get my paintball gun.
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Unread postAuthor: DYI » Mon Jun 23, 2008 3:33 pm

And finally DYI were you being sarcastic with that post?


No... Why would you think that? I generally use the "rolling eyes" smiley or something similar to indicate sarcasm over the internet.

My idea would be a lot cheaper, not to mention more powerful than most mentioned here. The fiberglass castings do work quite well, I've used them myself.
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