This is the O.S. .91HZ F3C Competition Helicopter Engine.

   **Additional Technical Info Will Be Added When It Becomes Available.**

FEATURES: Designed specifically for F3C aerobatic competition
          Rectangular heat sink allows engine to be enclosed entirely inside
            cooling shroud
          61-B carburetor with thermal insulator to block heat and a needle
            valve control lever to control mixture from transmitter
          Newly designed piston and crankshaft for reduced vibration and
            improved torque stability over entire RPM range
          Ball bearing supported crankshaft.
         

INCLUDES: 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

REQUIRES: 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- This is specific to the heli

SPECS:    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)
          Height from crankcase bottom to top of cylinder head:
          Height/bottom of mounting tab to top of cylinder head:
          Distance between mounting holes same side:
          Distance between mounting holes opposite side
          Distance between muffler screw holes:
          Distance/bottom of mounting tab to muffler screw holes:
          Length from front of case to backplate:
          Length from backplate to end of crankshaft:
          Width of crankcase below mounting tabs:
          Width between mounting tabs: