This is the one that blew up my tw account. Here is its more or less summarized page.
The main body is a Campbells® Hearty Beef Stew™ can.
The compressor is stamped (mashed with a hammer) sheet metal aquired from Home Depot.
Pictured: Entire rotating assembly on 1 5/8 threaded rod. This threaded rod would go on to spin quite fast and eventually warp from heat
The fuel was supplied by a coil of 1/4" copper refridgerator tube with pinholes poked in it. Both propane and MAPP were tried, MAPP seemed to run a little better and was the sole fuel for later tests.
Ignition was maintained by internal baffles (also sheet metal) to prevent flame out, and was constantly sparked from a lawnmower spark plug, driven by one of those cheap amazon 3kv supplies.