Hirth F-23
{{Short description|German two-stroke aircraft engine}}
{{Use dmy dates|date=January 2022}}
{{Use British English|date=January 2022}}
| {{Infobox Aircraft Begin
| name=Hirth F-23 | image= | caption= }}{{Infobox Aircraft Engine |type=Twin cylinder two-stroke aircraft engine |manufacturer=Hirth |national origin=Germany |first run= |major applications= |produced= |number built= |developed from= |variants with their own articles= }} |
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. It is manufactured by Hirth of Germany.Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-3 Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}}{{cite web|url = http://www.recpower.com/F-23%202%20cycle%2050hp.htm|title = F-23 2 cycle 50hp |accessdate = 17 January 2013|last = Recreational Power Engineering |authorlink = |year = n.d.}}Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 72. BAI Communications. {{ISBN|0-9636409-4-1}}
Development
The F-23 is intended to compete with the {{convert|50|hp|kW|0|abbr=on}} 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. Standard starting is recoil start. A belt reduction drive system, fuel injection, 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 {{convert|50|hp|kW|0|abbr=on}} at 6150 rpm and {{convert|40|hp|kW|0|abbr=on}} at 5500 rpm.
Applications
{{columns-list|colwidth=30em|
- Aeronix Airelle
- Air Sports AIRector 120
- Aurore MB 02-2 Mini Bulle
- DAR-23
- Fisher FP-303
- Monnett Moni - motorglider
- Rotorschmiede VA115
- Sadler Vampire
- Solid Air Diamant LP
- Spacek SD-1 Minisport
- TechProAviation Merlin 100
- Team Mini-Max AeroMax
- TeST TST-1 Alpin
- Wings of Freedom Phoenix 103
}}
Specifications (F-23)
{{pistonspecs|
|ref=Recreational Power Engineering
|type=Twin cylinder, two-stroke, aircraft engine
|bore={{convert|72|mm|in|1|abbr=on}}
|stroke={{convert|64|mm|in|1|abbr=on}}
|displacement=521 cc (31.8 cu in)
|length={{convert|247|mm|in|1|abbr=on}}
|diameter=
|width={{convert|570|mm|in|1|abbr=on}}
|height={{convert|338|mm|in|1|abbr=on}}
|weight={{convert|84|lb|kg|1|abbr=on}} including reduction unit, full exhaust system and electric start
|valvetrain= piston-ported
|supercharger=
|turbocharger=
|fuelsystem=2 X Bing 34mm slide or optional diaphragm type carburetor or fuel injection
|fueltype=unleaded 93 octane auto fuel
|oilsystem=50:1 fuel/oil premix
|coolingsystem=free air
|power={{convert|50|hp|kW|0|abbr=on}} at 6150 rpm
|specpower=
|compression=9.5:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
|designer=
|reduction_gear= cog belt with 1.8:1, 2.2:1 and 2.5:1 ratios optional
|general_other=
|components_other=
|performance_other=
}}
{{aircontent
|see also=
|related=
|similar aircraft=
|lists=
}}
References
{{Reflist}}
External links
- {{Official website|http://www.recpower.com/F-23%202%20cycle%2050hp.htm}}
{{Hirth aeroengines}}
Category:Hirth aircraft engines