O.S 18641 .91HZ-R 3C Speed Red 61F
This is the O.S. Engines 91 HZ-R
3C Speed Helicopter Engine in Red.
****** Because of the competition
nature of this engine,******
******it is NOT covered by the O.S.
2 Year Warranty.******
Features
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O.S 18641 .91HZ-R 3C Speed Red
61F
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Designed for all-out F3C
competition
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Demand Regulator System
ensures consistent fuel delivery from full to empty
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170° exhaust timing for
optimal horsepower and stable hovering
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Newly designed combustion
chamber shaped to match the big bore carburetor and advanced exhaust
cylinder timing
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0.44" (11.2mm) Big Bore 61F
carburetor for greatest power needed for F3C maneuvers
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Crankshaft counter-weight
reduces vibration at high RPM
Specifications
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Displacement: 0.91cu in
(14.9cc)
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Bore: 1.09" (27.7mm)
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Stroke: 0.98" (24.8mm)
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Output: 3.6 hp @ 15500 RPM
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Practical RPM Range:
2,000-16,500
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Weight (w/o Muffler): 21.2oz
(603g)
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Crankshaft Size: 5/16-24
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Height from crankcase bottom
to top of cylinder head: 4" (103mm)
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Height/bottom of mounting tab
to top of cylinder head: 3.1" (79mm)
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Distance between mounting hole
centers same side: 0.98" (25mm)
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Distance/mounting hole centers
opposite side: 2" (52mm)
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Distance/center of muffler
screw holes: 1.6" (42mm)
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Distance/bottom of mounting
tab to muffler screw holes: 1.7" (42.8mm)
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Distance/crankshaft center to
throttle control arm: 1.6" (42mm)
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Length from front bearing to
backplate: 3.3" (84mm)
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Length from backplate to end
of crankshaft: 4.5" (116mm)
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Width of crankcase below
mounting tabs: 1.7" (43mm)
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Width between mounting tabs:
2.4" (61mm)
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Carburetor Settings-
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High Speed Needle: Two turns
open from fully closed
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Medium Speed Needle: One turn
open from fully closed
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Idle Mixture Control: At basic
position when engine leaves factory
Contents
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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
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Fuel: 10%-30% nitromethane
with at least 18% lubricant. Lubricants may be either castor or synthetic
oil or castor/synthetic blend.
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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
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Muffler-Depending on heli
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