Thank you for the advice. During the time between me posting my initial query and now the cannon actually did fire on accident one time when I was working on the ignition system. Thankfully nothing was in the barrel except for paper towels and I am not dumb enough to look down the barrel. This led m...

Several weeks ago I set out to build my first metered propane cannon and up until actually trying to fire it things were going well. Every system works: the meter pipe holds pressure and seems to vent into the chamber, the fan turns on, the igniter (made from a stun gun) can be clearly heard arcing,...

i did another pressure test today and every single seal on my sprinkler valve leaked. I have sanded everything and filled every hole with 2 part epoxy and this thing WILL NOT WORK. I am done wrestling with this thing and i need something that will work. what kind of valve could i make or buy that wo...

I wrapped the tennis ball with electrical tape and if fits snugly now so that is not an issue. as for the problem areas on the valve i have some pictures, but they are terrible. I seem to have always been cursed with pressure leaks no matter what I try to fix them with. Im thinking about just runnin...

Thank you guys very much for your help with this problem. I took your advice with the valve and switched it out for a modified sprinkler valve and waited for a warmer day. I took it out and shot it when it was sixty degrees Fahrenheit outside and i noticed minimal difference. my other problem is no ...

All of my pressure fittings are steel, I know better than to use pvc for those parts. thanks for the advice with the piston valve, i will look into it.

just using a ball valve to vent the chamber, nothing fancy. I have one picture, but its terrible. Also I am using an entire cartridge per shot so the is not an issue with it running low on co2. Thank you very much for your help

Hello again spud files I have a bit of a challenge for you. I built a beauty of a mortar this week in an attempt to build something to give my team an edge in airsoft games, it is powered by 12 gram co2 cartridges and a convergent-divergent nozzle to boost power. I went out to fire it today and sadl...

An HPA setup will need a low pressure regulator, so expect to pay around $150 for bottle, reg and fittings. As cammyd32 pointed out, prolonged fire with CO2 can cause the line to freeze up, so some sort of expansion chamber prior to the trigger valve would be a good idea. Thank you for the good inf...

Hello Spudfiles just wondering if i could have a little help with a problem i am facing. I am going to build a flamethrower/bbmg for airsoft, nothing to crazy, but then a question arose, what is the best method for making a flamethrower portable? I have a small cobalt co2 regulator and 20oz tank tha...

thanks for the info and the speedy replies. The cannon i am building will be bolt action and will dump the reservoir for each shot bet will be hooked up to a co2 regulator and bottle so refilling the reservoir will be a snap.

Hello spudfiles i just have a quick question about a valve that I bought. My understanding of qevs is that they have a small spring inside them to push the piston back into place after the air reservoir has been released. so it came as a surprise when i could not find a spring in the valve and could...

Just thought I would Just make a post to thank all the admins for there work keeping the forum clean and relevant. Happy admin appreciation week everyone and sorry if this has already been posted.

Thanks for preventing me from making a stupid mistake. I think i will get to work on this round ASAP. one last question though, I see that this dart has fins so do i need to mess with the center of gravity of the dart to make it more stable or will the fins take care of that?

After you suggested a sub caliber dart i thought of a simple nail dart i made for one of my air cannons. It was just a nail with a paper cone wrapped around the head that fit the inside diameter of the launcher. perhaps a non lethal version of that would work as well? Thanks for all of the help with...