The Hirth F-23 is a twin cylinder,
horizontally-opposed,
two stroke,
carburetted or optionally
fuel injected aircraft engine designed for use on
ultralight aircraft
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 ailer ...
. It is manufactured by
Hirth
Hirth Engines GmbH is an engine manufacturer based in Benningen, Germany. It is currently a part of the UMS Aero Group. Hirth began manufacturing aero engines in the 1920s, was taken over by Heinkel in WWII to develop the Heinkel-Hirth jet en ...
of Germany.
[Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-3 Cybair Limited Publishing, 2001. ][Purdy, Don: ''AeroCrafter - Homebuilt Aircraft Sourcebook'', page 72. BAI Communications. ]
Development
The F-23 is intended to compete with the
Rotax 503 and is differentiated from the
Rotax powerplant by offering a horizontally-opposed cylinder layout. The F-23 uses free air cooling and piston-ported induction, with dual Bing 34mm slide or optional diaphragm type carburetors. The cylinder walls are electrochemically coated with
Nikasil
Nikasil is a trademarked electrodeposited lipophilic nickel matrix silicon carbide coating for engine components, mainly piston engine cylinder liners.
Development
Nikasil was introduced by Mahle in 1967, and initially developed to allow Wankel ...
. Standard starting is
recoil start. A belt reduction drive system,
fuel injection
Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines.
All comp ...
, tuned exhaust and electric start are optional.
The engine runs on a 50:1 pre-mix of
unleaded 93 octane auto fuel and oil. Recommended time between overhauls is 1000 hours.
The F-23 produces at 6150 rpm and at 5500 rpm.
Applications
Specifications (F-23)
References
External links
*
{{Hirth aeroengines
Hirth aircraft engines
Air-cooled aircraft piston engines
Two-stroke aircraft piston engines