O.S. MAX-91HZ-PS Ringed w/Pump 2-Stroke Engine for 3D Helicopter
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:
PD-08 pump works with a matched 61B-P carburetor and integral regulator to deliver a steady fuel supply at any attitude even during the most adventurous 3D manuevers
Short rectangular heatsink can be entirely enclosed inside cooling shroud to lower operating temperatures
Newly designed piston and crankshaft further reduces vibration and improves torque stability over entire RPM range
Thermo insulator on carburetor blocks engine heat to ensure more stable fuel/air mixture
Pull pull throttle setup
Package Included:
O.S. Max 91 HZ-PS Ringed Helicopter Engine
GLOW PLUG NO.8
Instruction Manual
Specifications:
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09 in (27.7mm)
Stroke: 0.98 in (24.8mm)
Practical RPM: 2,000 - 16,000
Power Output: 3.4 hp @ 15,000 RPM
Weight: 1.4 lb (635g)
Code No. 18620
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Helicopters 
