After building a prototype from bar stock, Eldon Dwyer made the patterns and castings to produce a second engine that he used in his power boat in 1982. He started a company called Robotronics that produced and sold a casting kit and drawings for the engine. It is not known how many kits he manufactured and sold, but this example is one of three built by Jim Hawk of Oklahoma in the late 1980s. It is water cooled (including the exhaust), sports a 120-degree crankshaft, and burns methanol on glow ignition. In the early 1990s, the Miniature Engineering Museum acquired the patterns, prototype and Eldon’s power boat engine. This engine is 13″- long, 7″-wide, and 7″-high.