Help with piston

Because potatoes only last one shot!
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spudthug
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omfg!!!!!!!! holy wow!!!!!!! this cannon is effing awesome!!!!!!!! i tested it inside today first with a bunch of tooth picks!! tooth picks went through 2 layers of cardboard(box)and then stuck into a peaice of plywood!!!!then i just used a was of paper and it went through the cardboard box the whole way through!!!!!!!!!!then one more test i did i tested it at 70 psi and with paper it put a huge huge dent in a piece of sheet metal!!!!!!!!!
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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PneuJose
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yea, same here lots of power. i used a ball valve before a piston. ROCKS!!!
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hi
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what do you mean you used a ball valve as a piston? you mean as the exaust? how did you do that?
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spudthug
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he said he used a ball valve before a piston
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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