Helicopter Engines

O.S. Engines is a leading manufacturer of single- and multi-cylinder model aircraft engines ranging from small two-stroke to "giant-scale" four-stroke radial engines. Japanese model engine manufacturer that produces very affordable and yet easy to use engines which won acclaim for their performance and durability.

MAX 105HZ-R with Powerboost Pipe 105 (OS72146000)

The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both '3D' and sport applications. The 15% increase in capacity offers a big increase over the .91 class engines yet still fits in mounts designed for that class.

Features:
Easy carburetor adjustment that stays in tune
More torque in the mid range for 3D
Velocity stack on carburetor sucks cool, undisturbed air from the fan flow
Power output of a 105HZ with 15% nitro is similar to a power of 91HZ with 30% nitro

The latest DRS system (Demand Regulator System) uses a crankcase pressure tap-off to pressurize the fuel tank via a one-way valve. The pressurized fuel is then carefully regulated at the carburetor to provide the optimum mixture no matter what demands are placed on it. This is done by using the negative pressure in the carburetor Venturi as part of the regulation system.

The carburetor itself has three mixture controls for low/mid and high speed settings. Once set for the fuel demands of your model/type of fuel and muffler, there is rarely any need to change those settings again.

The main mechanics of the engine itself are the same as with the regular MAX 105HZ engine.

Standard accessories:
Glow Plug No.7, 8, 10
Powerboost Pipe 90/105

Specifications:
Displacement: 17.17cc
Bore: 29.0mm
Stroke: 26.0mm
Output: 3.8ps / 3.75hp / 15000 rpm
Practical rpm range: 2000-16500 rpm
Weight: 608g (engine)

O.S. Engines is a leading manufacturer of single- and multi-cylinder model aircraft engines ranging from small two-stroke to "giant-scale" four-stroke radial engines. Japanese model engine manufacturer that produces very affordable and yet easy to use engines which won acclaim for their performance and durability.

MAX 105HZ-R with 61E Carburetor (OS18700)

The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both '3D' and sport applications. The 15% increase in capacity offers a big increase over the .91 class engines yet still fits in mounts designed for that class.

Features:
Easy carburetor adjustment that stays in tune
More torque in the mid range for 3D
Velocity stack on carburetor sucks cool, undisturbed air from the fan flow
Power output of a 105HZ with 15% nitro is similar to a power of 91HZ with 30% nitro

The carburetor itself has three mixture controls for low/mid and high speed settings. Once set for the fuel demands of your model/type of fuel and muffler, there is rarely any need to change those settings again.

Standard accessories:
Glow Plug No.7, 8, 10
Powerboost Pipe 90/105

Specifications:
Displacement: 17.17cc
Bore: 29.0mm
Stroke: 26.0mm
Output: 3.7ps / 3.65hp / 15000 rpm
Practical rpm range: 2000-16500 rpm
Weight: 596g (engine)

O.S. Engines is a leading manufacturer of single- and multi-cylinder model aircraft engines ranging from small two-stroke to "giant-scale" four-stroke radial engines. Japanese model engine manufacturer that produces very affordable and yet easy to use engines which won acclaim for their performance and durability.

MAX 105HZ-R with 61G Carburetor  (OS18750)

The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both '3D' and sport applications. The 15% increase in capacity offers a big increase over the .91 class engines yet still fits in mounts designed for that class.

Features:
Easy carburetor adjustment that stays in tune
More torque in the mid range for 3D
Velocity stack on carburetor sucks cool, undisturbed air from the fan flow
Power output of a 105HZ with 15% nitro is similar to a power of 91HZ with 30% nitro

The latest DRS system (Demand Regulator System) uses a crankcase pressure tap-off to pressurize the fuel tank via a one-way valve. The pressurized fuel is then carefully regulated at the carburetor to provide the optimum mixture no matter what demands are placed on it. This is done by using the negative pressure in the carburetor Venturi as part of the regulation system.

The carburetor itself has three mixture controls for low/mid and high speed settings. Once set for the fuel demands of your model/type of fuel and muffler, there is rarely any need to change those settings again.

The main mechanics of the engine itself are the same as with the regular MAX 105HZ engine.

Standard accessories:
Glow Plug No.7, 8, 10
Powerboost Pipe 90/105

Specifications:
Displacement: 17.17cc
Bore: 29.0mm
Stroke: 26.0mm
Output: 3.8ps / 3.75hp / 15000 rpm
Practical rpm range: 2000-16500 rpm
Weight: 608g (engine)

O.S. Engines is a leading manufacturer of single- and multi-cylinder model aircraft engines ranging from small two-stroke to "giant-scale" four-stroke radial engines. Japanese model engine manufacturer that produces very affordable and yet easy to use engines which won acclaim for their performance and durability.

MAX 55HZ-R

The latest engine in the 600/50 helicopter class borrows much of its technology from the fabulous MAX 105HZ-R, to provide class leading power under the most demanding conditions in 3D flying.

The latest DRS system (Demand Regulator System) uses a crankcase pressure tap-off to pressurize the fuel tank via a one-way valve. The pressurized fuel is then carefully regulated at the carburetor to provide the optimum mixture no matter what demands are placed on it. This is done by using the negative pressure in the carburetor Venturi as part of the regulation system.

The carburetor itself has three mixture controls for low/mid and high speed settings. Once set for the fuel demands of your model/type of fuel and muffler, there is rarely any need to change those settings again.

The main mechanics of the engine itself are the same as with the regular MAX 55HZ engine.

Standard accessories:
Glow Plug No.7, 8, 10
Powerboost Pipe 55/II/III

Specifications:
Displacement: 8.93cc
Bore: 23.0mm
Stroke: 21.5mm
Output: 2.1ps / 2.07hp / 17000 rpm
Practical rpm range: 2000-20000 rpm
Weight: 429g (engine)

O.S. Engines is a leading manufacturer of single- and multi-cylinder model aircraft engines ranging from small two-stroke to "giant-scale" four-stroke radial engines. Japanese model engine manufacturer that produces very affordable and yet easy to use engines which won acclaim for their performance and durability.

The best '50-class' engine on the market just became better with the introduction of the 50SX-H Hyper.

CNC machined cylinder head has been developed to give better power and improved cooling at the same time. The new carburetor has also been improved to help extract more power than the standard engine without sacrificing the throttle precision you have come to expect from OS helicopter engines.


Standard accessories:
Glow Plug No.7, 8, 10

Specifications:
Displacement: 8.17cc
Bore: 22.0mm
Stroke: 21.5mm
Output: 1.9ps / 1.87hp / 17000 rpm
Practical rpm range: 2000-20000 rpm
Weight: 406g (engine)