Coaxial means the chamber and barrel share the centerpoint.
The barrel is completely inside of the chamber.
Please don;t ever get used to this cannon..in the way that you feel safe because it has handled a certain pressure before.
It's gonna go one day or another...
i decided to build a cannon that would shoot ice/sand/ etc...
PVC gets brittle when cold.
I have personally held a cannon with ice ammo at the time it blew.
It cut my finger to the bone ( pretty much) and bruised my thigh severely.
Turned green/yellow and purple in a day or two...Before it was just black.
This was with a pressure rated cannon ( 250 psi working pressure!!) and no constructive mistakes to speak of..
DON'T EVER SHOOT ICE OUT OF A PVC CANNON!
I mean it.
All was fine until my brother pulled the pilot BV...
A very big and heavy 4" block nearly hit his head.This was the piston housing...and part of the Tee.
Only the barrel was cold, but once it blew it tore the valve apart, wich was about an inch thick of pvc where the pipe met the fitting.
It came apart like porcelin.
Excuse the all capitals..I truely believe this has the potential to mame or kill someone...