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O.S. 55HZ-H 15630 Hyper Ring 40L OSMG1955

O.S. 55HZ-H 15630 Hyper Ring 40L OSMG1955
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Item #:15630

O.S. 15630 .55HZ-H Hyper Ring 40L

This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.


  • O.S. 15630 .55HZ-H Hyper Ring 40L

  • Ideal for 3D flight-power equal to .60 size heli engines

  • Same mounting bolt pattern and silencer size as the OS 50SX-H Hyper

  • Dual needle 40L carburetor allows independent adjustment of idling, hovering and high speed with four arm throttle lever for use with a variety of servo brands

  • HZ Hyper low profile black aluminum six fin cylinder head

  • Two year limited warranty through manufacturer beginning at the date of purchase


  • Displacement: 0.55 cu in (8.93cc)

  • Bore: 0.91" (23mm)

  • Stroke: 0.85" (23.5mm)

  • Practical RPM: 2,000-17,000 RPM

  • Weight: 14.39oz (408g)

  • Carburetor Settings:

  • High Speed Needle Valve, Two turns open from fully closed

  • Idle Mixture Control Screw, Factory set-do not adjust

  • Medium Speed Needle Valve, Two turns open from fully closed

  • Distance/top of cylinder head-bottom of mounting tabs: 2.8" (72.6mm)

  • Distance between mounting holes same side: 0.68" (17.5mm)

  • Distance between mounting holes opposite side: 1.73" (44mm)

  • Distance between muffler mounting holes: 1.4" (37mm)

  • Cylinder Head Diameter: 1.8" (47mm)

  • Distance/bottom of crankcase to top of cylinder head: 3.6" (90.9mm)

  • Distance from center of engine to front bearing: 2.03" (51.6mm)

  • Distance from center of engine to end of Crankshaft: 3.2" (82.6mm)

  • Distance from center of engine to backplate bolt: 0.98" (25mm)

  • Distance from center of engine to throttle lever: 1.5" (38mm)

Package Contents

  • OS 55HZ Hyper Ringed Helicopter Engine with 40L Carburetor, #8 glow plug and instruction manual


  • 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)

  • Exhaust system such as the OS PowerBoost Pipe, OSMG2880

  • Starting equipment


  • N/A

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