O.S. Engines

55HZ-H Hyper Ringed Engine

Small in size – delivers big 3D power!

The 55HZ-H Hyper Ringed from O.S. has the power and reliability to make your heli do virtually whatever you want! Capable of installing in the same space as the 50SX-H Hyper, it features a brand-new, 3-needle 40L carb, a four-arm throttle lever for easy servo adjustments and more.
Specifications
Displacement: 0.55 cu in (8.93 cc), Bore: 0.91 in (23 mm), Stroke: 0.85 in (23.5 mm), Practical rpm: 2,000-17,000 rpm, Weight: 14.4 oz (408 g), Requirements: 10-30% nitro fuel with at least 18% lubricant