Oh and I built the "Lockdown Engine" - a large low-mid temperature stirling engine with only the scrap and hand tools available in my garage during New Zealand's lockdown. Computer fans for ball bearings, pots, part of an Esky, bits of a sun umbrella, part of a kite, aluminium and brass scrap. Power "piston" is the rubber weather seal from behind the headlight of a car. It was built to be a "Heath Robinson" kinetic sculpture too...Enjoy! [sorry about the violin torture]
the downloadable vid shows the Chinese engines