I had a friend in Wash State who owned a compressed gas Co. He made a Acet. Cannon out of 8' of 6" HEAVY WALL pipe. He would fill the barrel up with 50/50 mix Acet./02 and cover the end with plastic wrap.He fired it with a cap and ball fireing system from a black powder firearm. It would rattle the neighbors windows ACCROSS a 3 acre lake. Serious stuff. PK PS. disolving carbide in water is how Acet. is generated, be VERY careful!!