O.S 18642 91HZ-R 3D Speed Blk 61G
This is the O.S. Engines 91 HZ-R 3D Speed Helicopter Engine in Black.
****** Because of the competition nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty.******
Features
O.S 18642 91HZ-R 3D Speed Blk 61G
Designed for all-out 3D competition
Demand Regulator System ensures consistent fuel delivery from full to empty
165� exhaust timing for optimal horsepower and stable hovering
Newly designed combustion chamber shaped to match the big bore carburetor and advanced exhaust cylinder timing
Big Bore carburetor is designed to develope stable horsepower at 70-80% throttle which is widely used in 3D flight
Crankshaft counter-weight reduces vibration at high RPM
Specifications
Displacement: 0.91cu in (14.9cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Output: 3.6hp/15,500 RPM
Practical RPM Range: 2,000 - 16,000 RPM
Weight (w/o Muffler): 21.27oz (603g)
Crankshaft Size: 5/16-24
Height from crankcase bottom to top of cylinder head: 4" (103mm)
Height/bottom of mounting tab to top of cylinder head: 3.1" (79mm)
Distance between mounting hole centers same side: 0.98" (25mm)
Distance/mounting hole centers opposite side: 2" (52mm)
Distance/center of muffler screw holes: 1.6" (42mm)
Distance/bottom of mounting tab to muffler screw holes: 1.7" (42.8mm)
Distance/crankshaft center to throttle control arm: 1.6" (42mm)
Length from front bearing to backplate: 3.3" (84mm)
Length from backplate to end of crankshaft: 4.5" (116mm)
Width of crankcase below mounting tabs: 1.7" (43mm)
Width between mounting tabs: 2.4" (61mm)
Carburetor Adjustments-
High Speed Needle Valve: Turn approximately 30� (3-4 clicks) during initial adjustments, then approximately 15� (1-2 clicks) when making final adjustments
Medium Speed Needle Valve: Turn approximately 30� (3-4 clicks) at a time
Contents
91 HZ-R 3C Speed Helicopter Engine with #8 Glow Plug, Aluminum Check Valve, 0.008" (0.2mm) Head Gasket,, Aluminum Control Arm, two Needle Adjusting screws and Instruction Manual
Requirements
Fuel: 10%-30% nitromethane with at least 18% lubricant. Lubricants may be either castor or synthetic oil or castor/synthetic blend.
Field Equipment: glow starter, fuel bulb, fuel can filter, fuel pump hexagonal starting shaft (depending on brand of helicopter) electric starter, battery and fuel tubing
Muffler-Depending on heli
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