Tech thanks! this is the kind of criticism I'm looking for! The piston diameter is 3.5" and the barrel sealing surface is 2.25". So far in my test fires I've never herd any honking noises and I don't "think" the piston is moving back and forth during a fire. The noise is consistently one loud bang ...

pneumaticcannons wrote:
What are those sci-fi looking things connected to the barrel? reinforcements or just decoration lol

As gun freak said, they add support to the weld on the barrel/chamber connection. The only part I did purely for decoration was the muzzle break.

VERY NICE! what kind of amperage were you pulling when you did that?


I'm just starting to get more comfortable with aluminum and I'm quickly finding my 160A inverter machine has its limits when it comes to aluminum!

Probably around 220-240 amps for the rear flange and the barrel to chamber ...

Goats spudz wrote:Is that a relief valve on the side?

Yea, since I'm going to be running from high pressure helium tanks I wanted a safety backup in-case a regulator fails. It also makes it easy to drain the pressure without firing if I have to.

Hello Everyone! This is my first post and first cannon ever built.

I only found this site after I was finished building. (really could have used this place during the build) :banghead:

I started building this cannon as a way to launch heavy baits while surf fishing for shark but it quickly got ...