but then wouldn't that shorten the chamber and weaken the power of my gun

also do you guys think it's actually a crack? How could it crack so quickly? I just built it haha

blah, but how do I uncement the barrel??

Okay, well here is a different safety issue I need help with.

URL=http://imageshack.us] http://img452.imageshack.us/img452/9630/img1626fx2.jpg [/URL]

See the line? It kinda looks like a crack? The picture is kinda blurry, but in real life the line is very distinct. However, when I run my ...

I heard that if it's cold out, it's not safe to fire the potato cannon? Is this true? How cold?
It's like 30 degrees out, do you guys think it would be okay to shoot it?

And how many shots will I be able to fire before the potato cannon gets too worn out?

It really isn't all that hard to make something like this look really nice and work well. Theres a reason I spent the 1 dollar on the pipe and fitting for my handle along with the 10 total minutes of work. It's because it looks and functions great.

Why risk having hot air shoot at you when you can ...

put the bbq igniter in 20mm pvc pipe and get a pipe clamp and screw the pipe to the chamber using the clamp,try and get screws with brass rods on the end to screw it to the chmaber and hook the wires up to the screws,thats what i did so if you need a pic...

Ah.. not sure I got all of that. I ...

should I attach the wires to the heads of the screws on the outside of the chamber?

Yeah. How did you mount that box in the chamber? Do you have a picture?

sure

http://img153.imageshack.us/img153/8219/img1624gb1.th.jpg

It spark box is sort of just dangling inside of the combustion chamber ...

k so the wire is attached to the top of the screw.

But what if I just wanna leave this box in there?

http://img168.imageshack.us/img168/7853/img1614dy1.jpg[/url]

Ah caulk, good idea. thanks!

Attach the wires to screws which will thread into the chamber, forming a seal and a spark gap that will be unaffected by combustion pressure, unlike one that is formed using wires.

Currently I still have that "spark box" still in the combustion chamber. Couldn't I ...

You can't mount the igniter on the gun. It would fly out at very high speeds. You don't even have to mount it you can just have it dangling and just press the button. You don't need that metal box it is used specifically for grills. Just cut the wire and strip off the plastic on the outside.

all ...

All right, i'll think about it, but I'd prefer just putting the igniter on the gun. But my questions still stands, would the explosion inside of the combustion chamber damage the plastic igniter?

Hey, I'm building my first Potato Cannon. I cut the PVC pipes to the correct lengths and and cemented some of the pieces together. However, I'm stuck on mounting the Ignition System. I've seen a couple of configurations, but I'm not sure which to use.

I would prefer having the actual "red button ...