Happy New Year, everyone.
I have a fascinating new puzzle that began with contemplation of the Humpfrey pump, and general frustration over the lack of free-piston heat pumps on any fuel. Given the abilities of tuned pipes, it might be possible to dispense with even liquid as a piston. The basic notion is just this: Rather than extract combustible gasses for use in an IC engine, put solid fuel into the combustion chamber, but time the injection of high-pressure air to burn it, creating power pulses. There are hundreds of ways to achieve this, and a re- fueling mechanism to invent, but I see a lot of potential for overall simplification. Maybe a single log can be slowly fed in as the cylinder head surface. Even a common airtight stove might get modified to make useful pulses.
Thoughts?

Bob Stuart
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