Well, I guess Google has proved me wrong once again. I went shooting tonight at dusk and the cannon was working really well. I had to glue in my protective cap that isolates the handle with the electronics from the combustion chamber. Now that I eliminated that source of pressure loss we get a ...

Hahahaha that's a great story. I was planning on getting some glowsticks and putting them into the potatoes before launch. Also, I have a couple of videos I'm going to put on youtube as soon as I get out of class...one at night and one during the day. I google earth-ed (is that a verb now?) our ...

They don't fly very far compared to other ammo and fly like drunks driving. Getting friends together to shoot marshmallows through an old tire or other target is fun as they are very hard to hit.

Sounds like fun to me! I think I have some extra PVC laying around somewhere...I'll have to go get ...

Wow! Very nice job. I really like the propane injection system. Makes things less complex on the gun. Also, your "ignition chain" system is a great idea. I like the use of XLR cables!

Awesome job on the paint. And that NFPA diamond just makes it that much cooler! I have to put one of those on my gun...

Very nice.
How long is your barrel?
The barrel is 6 feet long, calculated from a barrel/combustion chamber ratio I saw somewhere...probably burnt lake.

Very nice, and well put together. Only thing I would suggest would be to remove the stickers and maybe the lettering from the meter pipe, and ...

Hey guys, I'm new here and I thought I would show off my first cannon. I finally convinced my mom to let me build it! She still doesn't like it...

The cannon is mixed PVC/ABS, the combustion chamber being the ABS part, and the barrel is PVC. I used 3 inch for the combustion chamber, with a threaded ...