This Edwards 2-cylinder supercharged opposed model aircraft engine was designed and built by Forrest Edwards in the 1990s. Mr. Edwards built and flew scale model airplanes and engineered miniature engines. He wanted to produce a small, lightweight and powerful miniature engine for the large-scale model aircraft racing circuit. To maximize the horsepower Edwards equipped his twin-cylinder engine with his own custom-engineered supercharger, a device for raising the pressure in an internal combustion engine.
This one-of-a-kind prototype runs on unleaded gasoline with spark ignition and a dry sump lubrication system. With its 1-3/4″ bore and 1-1/4″ stroke the supercharged twin produces approximately 15 horsepower at 7500 RPM using a 24-16 propeller. Courtesy of Forrest Edwards.