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O.S. Engines

91HZ Ringed

Championship-caliber performance!

O.S. Engines® 91HZ Ringed
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Ideal for F3C, the 91HZ Ringed delivers the high-end power and hovering stability required to execute competition-level heli maneuvers. Now features a 61-E carburetor for improved performance!

  • Ideal for F3C aerobatic competition.
  • Rectangular heat sink allows engine to be enclosed entirely inside a cooling shroud.
  • 61-E carburetor features a thermal insulator to absorb heat. A needle valve control lever allows you to control the mixture from your transmitter.
  • Piston and ball bearing-supported crankshaft are designed for reduced vibration improved torque stability across the entire RPM range.
  • Heat sink-type backplate.
  • Two-year limited manufacturer warranty.

Displacement: 0.91 cu. in. (14.95 cc), Bore: 1.09 in. (27.7 mm), Stroke: 0.98 in. (24.8 mm), Output: 3.4 hp @ 15,000 rpm, Practical RPM Range: 2,000-16,000 rpm, Weight (w/o muffler): 1.36 lb (618 g), Requires: 10%-30% nitro fuel with at least 18% lubricant, Field equipment and Muffler (depending on heli)

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