O.S. 55HZ-H Hyper Ringed Engine

Tower Stock# LXXSY8  •  Manufacturer Stock# 15630
O.S. 55HZ-H Hyper Ringed Engine (large view)
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Notes from our tech department:
This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.

FEATURES

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

INCLUDES

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

REQUIREMENTS

10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
Exhaust system such as the OS PowerBoost Pipe
Starting equipment

SPECIFICATIONS

Displacement: 0.55 cu in (8.93cc)
Bore: 0.91" (23mm)
Stroke: 0.85" (23.5mm)
Practical RPM: 2,000-17,000 RPM
Output: 2.1 PS, 2.07 HP
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)

jxs 9/01/09
ir/jxs

Resources
See Tower Catalog page 174.
Easy RC: Engines
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