The GEN 125 is a Japanese

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years ma ...

, designed and produced by the

GEN Corporation GEN Corporation of Japan developed a personal helicopter named the GEN H-4, but production was deferred pending large enough orders to make the aircraft economical.Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 20 ...

for use in

ultralight Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft. Some countries differentiate between weight-shift control and conventional three-axis control aircraft with aile ...

helicopter A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attribu ...

s.Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 2011-12'', pages 191 and 238-239. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X

Design and development

The engine is a twin cylinder

two-stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of ...

horizontally-opposed A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, wh ...

, air-cooled, , direct-drive, gasoline engine design. It employs

capacitor discharge ignition Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, turbine-powered aircraft, and some cars. It ...

and produces at 8500 rpm. The engine weighs . The engine was designed specifically for the GEN H-4 helicopter, in which four of the engines are mounted to provide redundancy.

Variants

;GEN 125 :Base model producing ;GEN 125-F :Model producing

Applications

* GEN H-4

Specifications (GEN 125)

References

External links