i didn't read what other people wrote, but I think you obviously need a fairly low pressure and also you need to use lots of wadding.

Wow, a down range camera man... that's smart.

ohhhh... i get it. it sucks, like a vacuum cleaner. that's a good one.

so basically the gas in the valve is like a bat out of hell and the gas in the vacuum is like some big dude that kicks the bat in the face and tells him to get back in there?

well Wikipedia only talks about fluids, so we are good...

I don't know for sure, but in going to say that a single piston valve would be more powerful. I built a massive cannon once and used a piston valve. I didn't use a bumper and the piston was solid wood with a bolt through it. the cannon fired 5 or 6 times, then the valve blew up in my face. I'm lucky...

yep. make the barrel longer and add a pressure gauge. next step is go have fun, and when you are bored with it upgrade to a modified sprinkler valve. by the bell-shaped reducer is DWV (drain waste vent) which is intended for exactly that, draining waste and venting fumes. it is NOT designed for pres...

soda bottle aren't pressure rated either...

Oh.. i didn't clean anything. :shock: didn't know thanks a bunch. So should i just use some hot soapy water? like i said, get rid of the old glue and primer (on the pipe, and buy new cement/primer while you are there) i usually use water and a rag. they sell pvc cleaner, but i have never used it. c...

i dont think that "blew up" is the correct term. i just sounds like you have a solvent weld fail. so it more like it popped off. solvent welding just takes a little practice. like i said, use plenty and dont skimp out. you dont want to over do it and make a mess, but dont try to get a way and save a...

take a 1.25'' tee, solvent weld a 1.25'' to .5'' bushing in it, glue on a female adapter on the other end, mold a piston with a sealing face (bolt on the sealing face) put a good bumper in it, then put a threaded male end cap on the end, then thread a nipple into the end, then screw on a ball valve ...

I bet, in fact i know that it was a bad solvent weld. be generous with both the primer and cement and apply the cement while the primer is still wet. i know i am always anxious to try out a new cannon, but i force myself to wait until its properly dried and i make sure i use pressure rated materials...

Get a zero trigger for the aps2 series. its much better than the stock trigger and it comes with a new piston. And also please dont call airsoft sniper rifles "snipers". Snipers are people who use sniper rifles. They are not interchangeable. this is a little OT, but that reminds me of the time i we...

looks pretty good. those hornady balls are .49'' in diameter. you can buy patches that are .010'' for muzzle loading, which if your barrel is exactly .5'', will be a perfect fit.

Joerg, what you need is a platinum pro series plus package with integrated on-board lithium stabilized groove and a nylon support structure to accompany the graphite reinforced handle that has a gyro stabilized counter sync mechanism. once you have done that, you should make a hand held ballista, th...