Daniel C. Harris  

This gamma sterling engine was machined from scratch in the University of Pennsylvania's 'Precision Machining Labs' (PML). A blow torch is used to heat the brown copper chamber on the front. As the air inside the chamber heats up, it expands and pushes a piston that powers the circular flywheel on the rear of the engine.

 

The angular velocity of the flywheel peaked at approximately 1400 rpm and rotated quietly as seen in the video below.