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.
Here's the complete cycle of using the coke bottle guns. Fuels from atmnospheric with alcohol, to 1 part N2O/1 part air/alcohol. I think it's decent for 0.50$ dollar lighter ignition, 1$ coke and 2$ piping.
