O.S. Engine OS-15638 55HZ Hyper 50-Class Helicopter Motor with Power Boost Pipe  [OS-15638]

O.S. #15638 - 55HZ HYPER w/Power Boost Pipe 55 (OS-72144000)
Price:
AUD$570.83
Brand:
O.S. Engine
Model:
OS-15638
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O.S. Engine OS-15638 performance note

The O.S. Engine OS-15638 55HZ Hyper is tailored for pilots who want elevated thrust from a 50-class package. It produces power comparable to many 60-size engines while fitting existing 50-size mounts, allowing an efficient upgrade without chassis modification.

Internal improvements on the 55HZ Hyper

A reinforced rear bearing is used to handle sustained high RPM operation and improve longevity. The dual needle 40L carburetor and four-arm throttle lever deliver accurate throttle response and integrate smoothly with various servo setups, ensuring consistent hover and idle behaviour.

How the Power Boost Pipe affects driveability

The included Power Boost Pipe is calibrated to the Max-55HZ Hyper to manage exhaust backpressure and widen the usable powerband. Its polished aluminium finish supports heat dispersion and keeps the exhaust running efficiently across throttle ranges.

Specifications

  • Displacement: 8.93cc / 0.55cu.in
  • Bore: 23mm / 0.91 in
  • Stroke: 21.51mm / 0.85in
  • Practical RPM: 2,000-20,000 RPM
  • Output: 2.1ps/17,000 RPM
  • Weight: 408g / 14.39oz
  • PowerBoost Pipe Length: 9.6" (244mm)
  • Diameter: 1.7" (44mm)
  • Exhaust Outlet Diameter: 0.35" (9mm)

Pilots experienced with high-performance helicopters will appreciate the O.S. Engine OS-15638 55HZ Hyper for its robust construction and the exhaust tuning that supports aggressive aerobatics and precise idle control.

Can this engine be used for competition flying?

Yes, its power output and matched Power Boost Pipe make it suitable for competition-level 3D routines, provided the pilot handles advanced tuning and maintenance.

What maintenance schedule should I follow?

Follow routine cleaning, inspection of the rear bearing and periodic carburetor checks after heavy use. Regular servicing keeps peak performance and reduces wear from high RPMs.

Will the engine fit common muffler setups?

The engine fits standard 50-class silencer configurations and is supplied with a Power Boost Pipe tuned for the Max-55HZ Hyper, so no special muffler modifications are normally required.

Is special tuning required for stable hovering?

Minor needle adjustments and throttle servo calibration are usually needed to dial in a smooth idle and stable hover, especially after fitting the Power Boost Pipe.

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