O.S. MAX-91HZ Ring 2-Stroke Engine for F3C Competition Helicopter
The next champion in F3C competition!
With back-to-back FAI world championships in 2005 and 2007, the 91SZ-H was a winner by anyone's standards. Now there's the 91HZ – a 91SZ-H redesigned with the help and advice of the world's top pilots. It offers the tuning ease and performance consistency of the multi-time world champion and design innovations that promote improved cooling, a tighter compression seal – and tuning ease!
Features:
The slim heatsink head fits into the fan shroud without having to cut it. So the fresh air through the fan cover effectively cools down the engine. The die cast head doesn’t create annoying high-frequency noise.
The new carburetor 61B is equipped with a thermo-insulator and in-flight needle control valve as standard accessories. Its fuel route is refined to correspond to high power. Double O-ringed main needle and O-ringed carburetor rotor prevent air leakage and engine power fluctuation. This new system secures stable and precise carburetor adjustment.
The newly designed back plate fulfils a role of heatsink. It is efficiently cooled down by the fresh air through the air inlets of full-covered helicopter body shell.
The piston is modified to attain a lighter body and better performance. The combustion gas presses on the piston ring from within through the five holes laid out on the piston top to minimize the blow-by gas.So the combustion energy is effectively transferred to the crankshaft.
Package Included:
O.S. Max .91 HZ Ringed Helicopter Engine
GLOW PLUG NO.8
NEEDLE CONTROL ARM
CYLINDER HEAD GASKET（0.2mm）
NEEDLE AJUSTING SCREW （M2.6 X 5 2 pcs ）
CARBURETOR Complete 61B
Instruction Manual
Specifications:
Displacement: 0.912 cu in (14.95 cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Output: 3.4 ps @ 15,000 RPM
Practical RPM Range: 2000-16,000
Weight: 21.8oz (618g)
Code No. 18600
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Helicopters 
