Böhm-Stirling Motors

The principle of the Stirling motor is very old… and very simple! Over 2000 years ago in ancient Egypt, the expansion of heated air was used to set temple doors in motion. The hot air engine patented in 1816 by Robert Stirling is based on a similar principle: A burner filled with fuel heats the air inside a cylinder and thereby purveys energy to the motor that activates through piecing of the flywheels.

More at Böhm-Stirling