O.S. MAX-55HZ-R Ring Hyper 2-Stroke Engine w/ Power Boost Pipe for Helicopter
This is the OS 55HZ-R Hyper Ringed Helicopter Engine with the 40L Carburetor. Equal to the 60-sizes!!
Best suited for 3D flight! Amazing power equal to 60 size engine changes the common knowledge of the 50 size helicopter engines! It can be installed in the 50 size helicopter without modification due to the same mounting bolt pattern and silencer installing size as the 50SX-H Hyper. New rear bearing is employed for improved anti-rusting, higher durability and more stable high speed running. Newly designed 40L carburetor features twin needle.
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 with four arm throttle lever for use with a variety of servo brands
Package Included:
One O.S. Max .55HZ-R Helicopter Engine with Hyper Cooling Head
40L carburetor decal sheet
#8 glow plug
instruction manual
Specifications:
Output: 2.1ps/17,000 RPM
Practical RPM Range: 2,000-20,000 RPM
Displacement: 0.55 cu.in (8.93cc)
Bore: 0.91in. (23mm)
Stroke: 0.85in. (21.5mm)
Weight: 15.13oz (429g)
Requires:
10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
Starting equipment
OS PowerBoost Exhaust Pipe for the 50SX-H Hyper and the 55HZ-H Hyper Helicopter Engines.
Features:
- Excellent performance from high RPM manuevers to idling and hovering
- Polished natural finish aluminum construction
Package Includes:
- OS 50/55 PowerBoost Exhaust Pipe
- 3.5x18mm socket head cap screws x 2
- Lock washers x 2
- Pressure nipple
- Instruction sheet
Specifications:
- Length: 9.6" (244mm)
- Diameter: 1.7" (44mm) at thickest point
- Distance Between Muffler Mounting Hole Centers: 1.4" (37mm)
- Exhaust Outlet Diameter: 0.35" (9mm)
Requires:
Silicone caulk to seal muffler to engine to prevent exhaust leak
Code No. 15653
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Helicopters 
