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i am going to make a mini combustion out of copper but i dont relly know how i get ignition because copper are a goond leader.
i cant get latern here so i dont know.
chamber is 48mm copper pipe!
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Do what I've done: get a brass plug, drill a hole through the end, put an insulated wire through the hole, and fill up the entire inside of the plug with JB weld (Clas Ohlson Art. no. 34-3468).
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How about a spark plug? You could either put it in the end plug of your gun and tap it, or if the plug is too thin, you should be able to find a threaded insert used for a car's cylinder head (if you're unlucky enough to strip the original threads) You could drill a hole through the end plug and use a nut (maybe two? on the inside to hold it in.
You could just use a nut on the inside directly to your spark plug, but you'd have to disassemble the cannon if you ever wanted to change the plug or adjust the spark gap.
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