The Saito FA100 4-Stroke Glow Engine is a compact, high-power powerplant designed for .60- to .90-size RC airplanes. With 17.1cc displacement and a muffler, it delivers the smooth, distinctive four-stroke performance and more power than typical .60-size two-strokes, giving modelers a capable upgrade for larger sport or scale airframes. Mounting is straightforward thanks to dimensions identical to the OS 91 Surpass, and the engine uses a 1.00-size footprint in a .91-size case for easy installation in many airframes. It weighs about 19.2 ounces with the muffler and features a newly tooled case compatible with OS 91‑style mounts. The FA100 includes the Hangar 9 Super Plug to improve idle and transition, and in-flight testing has shown smooth idle, crisp transitions, and instant throttle response, with a noticeable power boost when using higher-octane fuel such as a 30% helicopter mix. For pilots seeking a powerful, lightweight four-stroke for .60–.90-size projects, the FA100 stands out as a strong option.
