this is my rocket launcher cannon, it had considerable recoil, fires a spud out of sight in a straight line, and can fire a potato through 1/4 ply wood, and a bolt through 3/4 ply wood, the chamber is 2 inch by 30 inches, and the barrel is 1 1/4 for dcell batts, the valve is a 1 iinch modded sprinkler valve, with a red dot scope on the top, the valve is vented by a 1/4 ball valve.

SORRY! pic didnt come out.