O.S #18640 - OS 91HZ-R MAX W/61E-R Carburettor  [OS-18640]

This is the new version O.S. .91HZ-R Helicopter Engine, with improved design parts.

The Max 91HZ-R has been developed basing on the 91HZ designed expressly for 90 size helicoper models, equipping the new O.S. regulator system. The regulator system ensures 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, fuel tank is pressurized by pressure generatedin the crankcase. The fuel sent by pressure is regulated by the regulator installed just before the carburetor, then sent into the engine.

The new 61E-R carburetor equips twin needles which enable to adjust idlling / hovering and high speed mixture independently.

Features:

• This is a main fuel tank pressurized regulator system integrated version of the 91HZ
• Newly designed 61E-R Carburetor integrated with a regulator surely regulates pressurized fuel. As with other 91HZ engines, it features twin needles which can adjust hovering and high speed flight independently Regulator is located at a place where heat does not suffer and access is easier
• The system ensures stable fuel supply irrespective of rapid model attitude and G changes
• The system does not use muffler pressurized fuel system which requires needle adjustment according to the change of muffler pressure

Includes:

• O.S. .91HZ-R Helicopter Engine with Pump, 61E-R Carb, #8 Glow Plug, Check Valve, Head Gasket 0.2mm, Needle Adjusting screw (M2.6*5 2 pcs) , English Instruction manual

Specs:

• Displacement: 0.912 cu in (14.95 cc)
• Bore: 1.091 in (27.7mm)
• Stroke: 0.976 in (24.8mm)
• Practical RPM: 2,000 - 16,000
• Power Output: 3.4 hp @ 15,000 RPM
• Weight: 625g