Well, I would like to have it be under 18 inches long.

By the way, I found a dealer near me that sells 3 inch, sch 80 CPVC. Is that acceptable?

I know fully well the dangers of cell core as I have been a lurker here for a while, but I have no where to buy solid core here. I could have ordered, but I needed to meet a sudden deadline for a theater production. I am not asking if it is safe I am wondering if there is anything to make it more sa...

Does anyone know if either kevlar tape or carbon fiber on top of the pvc would help against shrapnel? I am sure a sheet of lead fabric wound around the chamber would contain any explosion.

I just bought the parts to my 2nd and 3rd cannons, made a twin set. They are already assembled, so this post might not do me any good. I bought the PVC for the chamber at a specialty plumbing store, and they said they had no solid core PVC. The salesperson assured me that many people have used this ...

Sorry to kick up a dead topic, but was there any conclusion as to the most efficient MAPP/oxy ratio? I would like to try this but I don't want to accedentially make too rich of a mixture. Thanks!

Yes, but are they looking at the USA oriented north, south, east or west?

Very fine indeed! Today it snowed in the northwest where I live, which is pretty rare, and I had the worlds greatest snowball fight. Mind you, I just packed loose snow in the barrell as I did not want the cannon to cost me any more in friend damages! I stopped after about 10 minutes cause the PVC wa...

Thanks so much markfh11q, that is exactly what I wanted to see. Jedwards: Yes, it works really really well. jrrdw: The ball valve was put there because we didn't know if the sprinkler valve needed to have back pressure to pressurize. I now only use it if I want to make sure it does not leak over a l...

Sorry, I was simply wondering if anyone could point me to the video on this forum that I mentioned. The search function is not working for it, and I stumbled on the video late at night and can't find it now. Basically, does anyone have an exposed-view video of a piston valve dry firing? Thanks again

What diameter barrel did you use to get the bottle to fit well (If it did at all)? Cool stuff. Thanks!

Depending on which brand of valve you have used, the pressure on the tank might be too little. My 1" Orbit Watermaster fully pressurizes at 80 PSI and up, below that it leaks a little. After 80 PSI, it lost no pressure after even 6 hours! Good luck.

Hey all! Love this site. I saw a video posted on a thread of a piston valve dry firing. The camera was able to see the rubber of the piston pushing out, so it was an exposed view. I have searched forever now, but cannot find it for the life of me! Thanks alot!