For several decades, Louis Heinrici had built hot air engines in twelve sizes from 26 to 190mm piston diameter and in the power range from 1.5 W to 0.2 kW. The larger machines used liquid cooling while, the smaller ones, air cooling was sufficient. The running speed under load was between 120 and 200 revolutions per minute. In the 1920’s, Ernst Heinrici introduced an improved engine which could run at up to 400 rpm. The machines could be heated by gas, liquid or solid fuels (luminescent gas, kerosene, wood). They weighed between 26 kg for the smallest and 662 0kg for the largest machine.
1 ½ inch diameter cylinder bore
20 inches high
7 inches diameter flywheel
4 iron castings (cylinder, flywheels, bracket)
1 aluminum casting (base)
*shipping weight approximately 20 pounds