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OS 37 SZ-H Ring Helicopter Motor

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O.S. Engines

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 Product Description

OS 37 SZ-H Ring Helicopter Motor


Designed to deliver premium performance for 30-sized machines, from extreme aerobatics to stable hovering!

  • The crankshaft has been re-engineered to reduce vibration, resulting in smooth power across the entire rpm range.
  • A larger rear bearing boosts power even more.
  • Features the same mounting pattern and muffler dimensions as the 32SX-H, for easy installation in most 30-size helis.
  • For easier access when making adjustments, the idle needle is positioned on the same side as the main needle.
  • Displacement: 0.37 cu in (6.07 cc)
  • Bore: 0.806 in (20.5 mm)
  • Stroke: 0.725 in (18.4 mm)
  • Practical rpm: 2,000-21,000
  • Output: 1.38 hp @ 18,000 rpm
  • Weight: 10.3 oz (293 g)
  • Includes: 20M carburetor, #8 glow plug


  • Muffler
  • Drive hub

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