Engine is brand new and still in protective covering , but not boxed , hence price.
The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both F3C 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. Modification to the cooling shroud is also unlikely. The distinctive 'blue anodised' cylinder head distinguishes the 105HZ engines from the 91HZ series yet retains the HZ series styling overall. General internal design is very similar to the 91HZ series and draws on OS's deep experience in creating the best helicopter engines for all classes. Advanatges over 120 size heli engines of other makes:
The MAX-105HZ-R has been developed expressly for 90 size helicopter models, equipping the O.S. regulator system. It's mounting dimension is the same as the conventional 90 size engines, while the displacement is increased by 15%. Also, the conventional 90 size models gear ratio can be used with this engine without any modification. The regulator system ensures an always steady fuel supply which is required for 3D flights which require repeated vigorous attitude changes as well as for F3C flights which require severe mixture control. With this system, the fuel tank is pressurized by pressure generated in the crankcase. The fuel sent by pressure is regulated by the regulator installed just ahead of the carburetor, then sent into the engine. The new silencer PowerBoost 105 has also been developed to match the 105HZ-R, While the conventional 90 size silencers can also be used with the 105HZ-R. A large velocity stack is supplied with the engine to be installed on the 61G carburetor. Cool fresh air is conducted to the carburetor intake so that the engine can develop ideal power characteristics. When the governor function from Futaba GY-701 or GY-750 gyro is employed, the Futaba BPS-1 Back Plate Sensor can be installed in a cell on the back plate. By employing the governor function, more stable flight can be achieved. The upper left back plate retaining screw may be used for a battery ground terminal when connecting the glowplug battery
* Uses same main gear ratio as .91 class engines
* Vibration levels the same as the 91HZ so does not tend to break heli parts.
* Easy carburettor adjustment that stays in tune
* Crankcase is noticeably cooler
* More torque in the mid range
* Velocity stack on carburettor sucks cool, undisturbed air from the fan flow.
* Longer run time per tank
* 105HZ with 15% nitro is similar power to a 91HZ with 30% nitro.
* Displacement: 17.17cc / 1.048 cu.in
* Bore: 29.0mm / 1.142in
* Stroke: 26.0mm / 1.042in
* Output: 3.7ps / 3.65hp / 15,000rpm
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