The O. S. 55HZ-H Hyper Ringed Heli engine is cause to rejoice for 3D heli flyers! The 55-HZ-H Hyper Ringed engine cranks out optimum power with a minimum of space! The PowerBoost Pipe 50/55 is a first from O.S. – designed especially for helis, improving efficiency and power while featuring a compact size. It also fits the 50SX-H Hyper Ringed heli engine.

• Features the same mounting pattern and silencer size as the 50SX-H Hyper engine
  
  
• Dual needle 40L carburetor with four-arm throttle lever is designed to optimize the power, performance and reliability of the 55HZ
  
  
• Produces a range of 2,000 - 20,000 rpm
  

SPECIFICATIONS
Stock Number: OSMG1955
Displacement: 0.55 cu in (8.93 cc)
Bore: 0.91 in (23 mm)
Stroke: 0.85 in (21.5 mm)
Practical rpm: 2,000-20,000
Power Output: 2.1 hp @ 17,000 rpm
Weight: 15.40 oz (408 g)
15630 55HZ-H Hyper Parts Listing