Hot Air Motor. Functional Model of a Stirling engine. The simple assembly of the various standard and prefabricated parts results in a fully functioning model. The hot-air engine is powered by 2 tealights (not included in the pack). The use of a working membrane instead of a cylinder avoids fitting and sealing problems. The construction process only requires a drill press and a vice. Illustrated instructions with templates are included. Required work: scribing, drilling, sawing, gluing and assembling. Size: 115 x 115 x 180mm.