#15638 O.S. – 55HZ HYPER W/Power Boost Pipe 55 (OS-72144000)

This O.S. Max .55 HZ Ring Hyper Helicopter Engine comes with Hyper Cooling Head
and 40L Carburetor. It is 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.

The PowerBoost pipe is a sliencer developed exclusively use of Max-55HZ Hyper
/ 50 SXH Hyper. This Sliencer delivers excellent high performance in th R.P.M.
range used regularly in doing maneuvers, while it secures the stability in idlling
and hovering.

Features:

• Ideal for 3D flight-power equal to .60 size heli engines
• Ideal for use in any 50 class helicopter
• major internal parts are newly designed pursuing the best performance required
  for the 50 size helicopters.
• 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
• OS Powerboost pipe provides excellent performance from high RPM manuevers
  to idling and hovering. Polished natural finish aluminum construction

Includes:

• One O.S. Max .55 HZ Helicopter Engine (OS 15630) with Hyper Cooling Head,
  40L carburetor, #8 glow plug, English instruction manual
• OS 50/55 PowerBoost Exhaust Pipe with two 3.5x18mm socket head cap screws,
  two lock washers, pressure nipple and instruction sheet

Specs:

OS Max 55 HZ

• 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

OS PowerBoost pipe

• 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)
• Output: 2.1ps/17,000 RPM