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TECHNICAL  DRAWINGS Go here for complete replacment part lists and drawings.
 
 
 
 
 

no. 2711 O.S. Max .91 RX-HG Heim Version

Product information:
14.95 cc capacity. Rear-exhaust helicopter engine with 8 mm GRAUPNER / Heim crankshaft.

PDF file download
 

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no. 2718 O.S. Max SX-HG Hyper .50

Product information:
8.17 cc capacity
Helicopter motor with long ground 8 mm Ø crankshaft, 60LH carburettor and "Hyper Head" extreme heat-sink head.

Specification:

Capacity [cc]: 8.17
Power approx.[kW (BHP)]: 1.40 (1.9) at 17,000 rpm
Rotational speed approx.[rpm]: 2,000 - 20,000
Bore [mm]: 22.0
Stroke[mm]: 21.5
Carburettor: 60 LH
Shaft thread: 1/4"-28 UNF
Weight approx.[g]: 406
 
 
 

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This is a High Performance Engine Developed Expressly for F3C M Class
Helicopter Competition Utilizing .50 Cubic Inch Engines.
The Engine Uses the Same Mounting Hole Spacing as the O.S. 46FX-H Ring,
Making the Two Engines Interchangeable. A Special Machined Drive Washer
and Dual Throttle Levers are supplied as standard for Helicopter Use.

       SPECS:    Displacement: 8.17cc (0.499 cu in)
                 Weight:       413g (14.58 oz)
                 Power Output: 1.8 bhp / 17,000
                 Practical RPM Range: 2,000 - 20,000 rpm
                 Starting Setting: Main Needle 2 Turns out from Fully Closed
                 Fuel: 10% to 20% Nitromethane with at least 18% lubricant
                 Recomended Glow Plug: #8, A3 or A5
                 Throttle has 77 degrees of travel
                 Factory Settings: Main Needle Fully Closed
                                   Midrange is Centered (Slot of Adjustment Screw is
                                     in line with Carburettor Body.
 

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