I disagree Acorn Mush, I think he should hold it when he fires it. Stupid SHOULD hurt.
(This is a JOKE. I'm NOT really calling the OP stupid so no one get your undies in a bunch.)
Only you know your motives for posting to a thread. The internet is an imperfect medium for communicating meanings and motives. Lack of face to face eliminates body language.
I anticipated some good natured ribbing with mutual smiles from all including myself. I also anticipated replies from those suffering from little-man syndrome or bully tactics common to school yard 12 year olds, hiding behind anonymity. There are just those in our world who try to boost their own self image by denigrating others.
Only you know which group you belong to.
If I do get motivated, which is doubtful since I have MS, I don't plan on trying to shoot armor piercing sabot rounds like the tanker guy with his Abrams 115. The reason I mention a sabot of some sort was to have a small, relatively light projectile, preferable a vegetable of some sort, encased by a lighter material, such as canned spray foam available in hardware stores, cut in half and formed into a ball, to fill up the bore. That way any powder used would be in drams not pounds, and in small enough amount to just go bang. I've had forth of July fireworks that launched sky burst out of a cardboard tube with about the same size and weight as I'm talking about but without the planned sabot.
By co-incidence, I saw a bit of the show "Weaponology" from times past were a copper/brass tube that looked to be two inches in diameter with a wall thickness of 1/8" and about 6 feet long that was wrapped with leather to a thickness of about two inches of leather and used as a cannon. They fired it in their test several times. Had their powder bag, looked to be about four to six ounces of black powder, attached/tied to another bag of grape shot rammed down the barrel, pricked with a hollow goose quill they had filled with fine black power in it for the fuse and lit the thing with a smoldering rope on a stick. They fired it at a line of plywood men line up like in colonial times. Grape shot is an ugly thing.
My son's paintball gun reaches a velocity of 325 FPM. This was to be my goal, only with a bang instead of a whoosh to get things going.
To the critics, I'M NOT TALKING ABOUT A LARGE POWDER CHARGE SHOOTING A HEAVY, SOLID OBJECT. The speed and fps similar to a paintball gun would be acceptable, only with a tomato wrapped in some material to make the sabot. I'm not looking for something that when landed would damaging something or make a pipe bomb. That is why I gave up on frozen veggies.
Like I said, the idea is more just speculation, food for thought than actual plan. I don’t want to waste that much oxy/acetylene. The driveshaft/tennis ball idea would be a much better plan.
to use the HP cylinder material, I humbly suggest you at least bury the contraption with the muzzle maybe 6" below ground level before you fire it (remotely). That way, should there be a "violent dissociation" (read, explosion) of the pressure-containment vessel, at least the surrounding soil would provide some measure of safety from flying bits and pieces of hot metal.
