Hirth F-40
{{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-40 | image= | caption= }}{{Infobox Aircraft Engine |type=Aircraft engine |manufacturer=Hirth |designer= |national origin=Germany |first run= |major applications= |produced= |number built= |developed from= |variants with their own articles= }} |
The Hirth F-40 is a German aircraft engine, that was designed and produced by Hirth of Benningen for use in ultralight aircraft.Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 258-259. Flying Pages Europe SARL, 2015. {{ISSN|1368-485X}}
By March 2018, the engine was no longer advertised on the company website and seems to be out of production.{{cite web|url = http://www.hirth-engines.de/index.php/en/all-engines|title = All Engines|accessdate = 19 March 2018|author=Hirth |work =www.hirth-engines.de}}
Design and development
The Hirth F-40 is a four-cylinder, two-stroke, {{convert|1300|cc|cuin|1|abbr=on}} displacement, liquid-cooled, petrol engine design, with a helical gear mechanical gearbox reduction drive. It produces {{convert|120|hp|kW|0|abbr=on}} at 4800 rpm.
Specifications (F-40)
{{pistonspecs|
|type=Four cylinder, two stroke aircraft engine
|bore={{convert|76|mm|in|1|abbr=on}}
|stroke={{convert|69|mm|in|1|abbr=on}}
|displacement={{convert|1300|cc|cuin|1|abbr=on}}
|length=
|diameter=
|width=
|height=
|weight={{convert|69|kg|lb|1|abbr=on}}
|valvetrain=
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=petrol
|oilsystem=
|coolingsystem=liquid
|power={{convert|120|hp|kW|0|abbr=on}}
|specpower=
|compression=
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
|designer=
|reduction_gear=helical gear mechanical gearbox
|general_other=
|components_other=
|performance_other=
}}