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OS FX .91
Designed for sport, but engineered for excellence, the .91 FX offers the power and user-friendly features of other FX Series engines in a displacement fit for large-scale aircraft. The .91 FX neatly bridges the power gap between .60-size glow engines and gas engines, by offering the easy familiarity of glow technology combined with the added power that today's large-scale modelers demand. With its top output of 2.8 bhp, the .91 FX can put a large-scale plane through its paces with ease. And with O.S.' meticulous testing and design behind it, large-scale pilots can fly the best in long-term dependability.
  • Multi-position remote-mounted needle valve design offers greater flexibility and safety for the pilot. The needle valve can be positioned upright or to the side to avoid cowl modifications and preserve scale looks.
  • Coarse threads and an O-ring seal on the needle valve minimize settings creep over time due to vibration and air leaks, providing more flights with fewer adjustments.
  • Extra-long crankshaft and locknut assembly offer more thread length for better prop nut engagement and more safety for pilots and onlookers.
  • A lower crankcase profile leaves room for more head height and cooling fins-semi-squared head design further enhances cooling capacity and performance.
  • Dual bearing design includes a larger front bearing for added durability and smoothness
  • Includes Muffler, Safety Propeller Locknut Assembly, #8 glow plug
  • Displacement 0.912 (14.945 cc)
    Bore 1.090 in (27.686 mm)
    Stroke 0.976 in (24.79 mm)
    RPM 2000 - 16000


    2.8 BHP @ 15000 RPM
    Weight 19.3 oz (547 g)
    Recommended Props 13x8-9
    Price R Not Available