O.S. Engines, founded in 1936 in Japan by Shigeo Ogawa, has become a world-leading manufacturer of model engines—spanning glow, petrol, Wankel rotary, and multi-cylinder four-strokes. They introduced the first Japanese rotary model engine in 1970 and pioneered modern four-stroke glow engines in the mid-1970s.  Today, O.S. offers precision-machined single- and multi-cylinder engines—from small .10 glow units to giant-scale flat-fours and seven-cylinder radials—plus accessories like glow plugs, mufflers, and filters. Known for exceptional craftsmanship, advanced electronics like EFI systems, and consistent performance, O.S. remains a top choice for serious RC aircraft and car modelers.