O.S 18650 .91HZ Ring 61E
This is the O.S. .91HZ F3C Competition Helicopter Engine.
Features
O.S 18650 .91HZ Ring 61E
Designed specifically for F3C aerobatic competition
Rectangular heat sink allows engine to be enclosed entirely inside cooling shroud
61-E carburetor with thermal insulator to block heat and a needle valve control lever to control mixture from transmitter, carburetor has three adjustment controls that enable independent adjustment at idling, hovering and high speed
Five holes in the top of the piston route gases to the piston ring from within to form a tighter seal with minimum blow by
Ball bearing supported crankshaft
Heat sink type backplate
Two year limited warranty through Hobby Services beginning at date of purchase
Specifications
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09" (27.7mm)
Stroke: 0.98" (24.8mm)
Output: 3.4 hp @ 15,000 RPM
Practical RPM Range: 2000-16,000
Weight Without Muffler: 1.36lb (618g)
Crankshaft Size: 5/16-24
Height from crankcase bottom to top of cylinder head: 3.9" (99mm)
Height/bottom of mounting tab to top of cylinder head: 3.2" (81.2mm)
Distance between mounting holes same side: 0.98" (25mm)
Distance between mounting holes opposite side: 2.04" (52mm)
Distance between muffler screw holes: 1.6" (42mm)
Distance/bottom of mounting tab to muffler screw holes: 1.7" (42.8mm)
Length from front bearing to backplate: 3.3" (84mm)
Length from backplate to end of crankshaft: 4.9" (125.6mm)
Width of crankcase below mounting tabs: 1.7" (43mm)
Width between mounting tabs: 2.4" (61mm)
Carburetor Needle Settings:
High Speed: 2 turns out from fully closed
Mid Range: 2 turns open
Mixture Control (low speed): indentation on screw head straight up and down (vertical)
Contents
O.S. .91 HZ F3C Competition Helicopter Engine with #8 glow plug, needle control lever, extra 0.2mm head gasket, cap 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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