Never knew you cannot go above what the piece is rated. Just make sure everything is rated to 5000 PSI, get a good valve, good C:B ratio, and a scuba tank. Maybe try to induce some backspin too, not sure if that'll work the same as it does on golf balls, but who knows =) If only pumpkins wouldn't be...

Piston valves are pretty quick, but I'm almost positive they use modified butterfly valves in this competition. If you could design a reusable burst disk where there is a split in the middle and the flaps blow out to the side but close back up after the shot. Piston valve will do fine I'm sure, just...

well i seem to have run into a problem. i went to get supplies today nut all the 3 inch pvc i could find was cell core no pressure stuff. so i think im going to use two 24 inch chambers with 2 inch diameter which will get me about 150 cubic inches. would i get a performance decrease if i where to c...

I've heard to many freak accidents with acethylene. I'm going to pass under that. I'll start with starter fluid and work with other fuels if this project goes over. I was going to use copper piping, but from what I've read in responses this isn't a great idea. How high would pressures reach(I know t...

I was thinking about doing it with PVC, but I don't think it could take the pressure. I got the idea after see this http://www.youtube.com/watch?v=gLzEqfRVeOA I'd want to go on a larger bore than bbs, Golf balls would be purty. Not sure what I'd use for fuel either, I was thinking propane, but i don...

What will you shoot good sir?

Completely off topic, awesome post Jeep had me in tears.

How heavy is that barrel?! Can I ask how big your chamber is that your using 70" barrel? Is it over under style? More info would be helpful, if it's not over under I'd suggest getting a stand as crazy as it sounds.

Fire extinguishers? If so just search that word alot of nice copper guns made from them.

Sorry to hear. Shy away from drugs/alcohol to ease the pain it will only make it worst. Try to be with people that make you happy and try to keep busy, being alone is when it will hurt the most. Best thing to do is be around your friends. I'd say it will go away, but the lose of some1 never does. If...

The honk isn't from the cannon itself firing. Some reason when filling it honks fast and is fine from there out. Thanks for the comments again. I've been having trouble with finding time to get it out to shoot/ take pics, sorry.

WD-40 on the pipe a rubber mallet and it will slide nice.

http://www.spudfiles.com/forums/viewtop ... tml#240585
Pretty basic idea how to build my current valve

and my old one which is simple as well,
http://www.spudfiles.com/forums/how-i-b ... ter,0.html

NSF-PW sch 40 fittings are fine check out
http://www.flexpvc.com/cart/agora.cgi?p ... -outlet-90

Cheap fittings, large sizes, and all pressure rated. Just click on what you need on the side.

Paint it to a color of your liking, use krylon fusion paint its for plastics. Great cannon by the way keep it up.