Robert Hoskins, President of Aero Tech Inc. (Tennessee) developed this engine in 1979 to fly his model airplane. He wanted scale sound; something the 2-cycle engines could not produce. Striving for light weight reliability, he machined this model from aluminum bar stock and engineered 13 ball bearings into it—6 that support the crankshaft alone. Although expensive to construct, the reliability and power output were worth the effort. The engine turned 7,500 revolutions per minute with a 20-6 propeller on glow ignition and flew his 35-pound airplane with ease.