Ideas for a simple recoil system?

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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jimmy101
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Wed Dec 17, 2014 5:25 pm

The fact that the part is Sch 40 means nothing (except that all Sch 40 parts fit together). The problem with most PVC screw caps is that they are "cleanouts". Cleanouts are only used in DWV (drain-vent-waste) systems, which are non-pressurized, so the part is not pressure rated.
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