Fuel-less Space Engine (Stirling)

Focus sunlight on this  model engine and it runs at full speed. Plans to build a solar powered Stirling engine. With description and drawings.

'Power is ample to drive a midget water pump or spin a display turntable. For indoor exhibits, such as in Science Fairs, a heat lamp can replace the sun. As a mantelpiece model, the engine can be operated on paper matches, alcohol, or fuel tablets.'