Pushing the limits of potato gun technology...
The main combustion chamber is a 20 gallon oil drum. I welded spark plugs into the bottom as well as connectors for oxygen gas and map gas (methyl acetylene). After loading the spud, filling it with fuel, I ignited it from 10-20 feet away with a switch wired to the spark plugs.
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Other Interesting Things About This Project:
It was too powerful for spuds. They would disintegrate. So I had to make wooden dowels to fire out of the beast.