any idea how big the cap and resistor should be? I understand the idea but I dont know enough about electronics to figure out how big they should be, can I get the stuff at radio shack or something? What would be the best switch to use, just a heavy duty momentary on/off push button??? Ill cement th...

My spark is about the same as the one in your pic Id say, but I cant see very well. Ill try putting a switch on it, that makes sense. As far as the chamber fan goes- I do still have the clean out cap on the end so I guess I could blow it out that way, I just thought it would work with compressed air...

I was bored one weekend so I started looking up potato cannons online and drew up some plans and heres what I came up with- Its made entirely out of black ABS pipe, the barrel is 3" pipe and about 5' long. The combustion chamber is 4" pipe cut into little pieces and cemented together with 4" couplin...