Best Deal #100...Save $50.00!...Best Deal #100...
O.S. Engines® 91HZ Ringed
Features
Five holes in the top of the lightweight piston route gases to the piston ring from within, resulting in a tighter seal and minimum blow-by.
There's no need to fabricate an arm to make in-flight needle adjustments – the 91HZ Ringed already includes one. Just install to enjoy more in-flight tuning flexibility!
A heat sink machined into the end of the crankcase increases cooling and improves performance.
Championship-caliber performance!
Click the picture to view video
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.
Specifications
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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