thanks for the input guys. i will be tearing this thing down this weekend and rebuilding with pressure rated fittings. Even if there is a very small chance of this thing blowing up I am not willing to risk getting hurt over shooting a damn potato

thanks again.

if you look at the post right below this one that i started.....you can see what im working with.....do you guys think i should not be firing this thing.

well, i realized that i bought dwv fittings for my spud gun that i posted pic of. the wye fitting is dwv. Are these things like death or will I be ok with using them.

thanks and sorry for the noobness.

crap...

well i just inspected my wye fitting and it si in fact a dwv fitting. With a combustion chamber of this size should I be worried about this and scrap the project or what?????

As some of you guys have seen I have been making some combustion cannons and would like to learn about compressed air cannons. I found BCArms link on here and purchased their small inline kit. I figured it would make a good starter kit for me and then I can expand my knowledge from there. The reason ...

Where did you get the Adapter for the propane tank. I got myself a tank like that today, and the place that had the tank did not have the adapter, unless i butcherd the torch that one normaly buys with it.

Other than my little question, nice gun.

the tank is connected to to one of the regular ...

I am not seeing a chamber fan. If you add one it will become a lot more reliable/ better. If I were you I would add the fan, then put a 2 inch ball valve on the butt end of the gun so it would be easy to open and vent after each shot. Other than that it looks like it does pack quite a punch. nice ...

you should get a longer barrel and shorten the chamber, but thats pretty nice

yeah i was thinking that as well. But i wanted to go with something portable but with a larger than normal combustion chamber to try and pack a bigger punch. Now i just need to dial in my propane.

Please if anyone ...

24in of 3"sch40 coupled to 26" of 1.5" sch40

made my own regulator from an inline pneu-trol valve which i rigged to have a psi gage hooked onto it.

enjoi! ;)

http://i20.photobucket.com/albums/b217/quichr38/DSC00021.jpg
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http://i20 ...

well, here are some pics of my gun.....lemme know what ya think.

i tried it out and 3-4 shots of the propane results in a pretty nice shot :D

http://i20.photobucket.com/albums/b217/quichr38/DSC00021.jpg
http://i20.photobucket.com/albums/b217/quichr38/DSC00020.jpg
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You need to inject 4% of your chamber volume worth of propane.

Having 14.7 psi in the meter will put one meter-volume of propane in the chamber. 30 psi will put 2, etc. Let's see if you can figure this out :)


2. I'd fill the cleanout cap with hotglue or epoxy to strengthen it. They have blown ...

yes the pipe I bought has a pressure rating i believe it says 330psi on the side of it. As far as the fittings, I am not sure if they are pressure rated.

I will try and get some pics up tonight.

what do you mean tweak the regulator till it gets a blue flame????


also, and this is probably a ...

Whats up folks. Newb here.


Questions I have:

1. I made a metering system exactly like what spudtech guy uses with 6" of 3/8 brass and 2 ball valves with a regulator etc. My combustion chamber is 24" of 3"sch40 pvc. How many charges of my propane meter do I need for this. I have my regulator set ...