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Tuesday, September 09, 2008

Hog Motor | Fully Working Desktop Stirling Engine

This desktop Stirling engine is powered by the expansion and compression of air when heated and cooled, and uses the same simple yet elegant dynamics as the stirling engines from the Industrial Revolution.

Invented in 1816 by the Reverend Dr. Stirling to create a safer, more efficient alternative to steam engine boilers, the Stirling engine is still taught in mechanical engineering courses at leading universities to demonstrate the high efficiency, quiet operation, and heat utilization of closed cycle regenerative heat engines.

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Handmade in Germany, the unit has a solid brass body and a glass cylinder and piston that are precisley designed to minimize friction, eliminating the need for lubrication.

The alcohol burner heats the glass tube, ca using the air inside to expand and push the horizontal piston towards the chamber. This movement displaces some of the warm air into the metal chamber where it continues to expand, forcing the vertical piston upward.

The pistons are connected to the flywheel with a system of levers and pulleys, causing the flywheel to spin up to 5,000 RPM and enabling the sequence to repeat until the flame is put out.

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