Hirth HM 504
{{Short description|1930s German aircraft engine}}
| {{Infobox Aircraft Begin
|name = Hirth HM 504 |image = File:Hirth HM 504 Aircraft engine at Flugausstellung Hermeskeil, pic1.jpg |caption = Hirth HM 504 on display at the Flugausstellung Hermeskeil }}{{Infobox Aircraft Engine |type=Inline piston engine |manufacturer= Hirth-Motoren GmbH, Stuttgart-Zuffenhausen |national origin= Germany |first run= |major applications=Bücker Bü 131 |number built = |program cost = |unit cost = |developed from = |developed into = Hitachi Hatsukaze |variants with their own articles = }} |
The Hirth HM 504 is a four-cylinder air-cooled inverted inline engine. The HM 504 was a popular engine for light aircraft of the 1930s-1940s, and it was used to power a number of Germany's trainer aircraft of World War II. The engine featured a cast magnesium alloy crankcase made of Elektron{{cite book |last=Gunston |first=Bill |title=World Encyclopaedia of Aero Engines |year=1989 |publisher=Patrick Stephens Limited |location=Cambridge, England |isbn=978-1-85260-163-8 |edition=2nd |page=77}}{{cite journal |title=Werkstoff-Volumenanteile der 'AR' 79 |trans-title=Materials proportions by volume of the AR 79 (advertising back matter) |journal=Flugsport |place=Frankfurt/Main |volume=31 |issue=8 |date=12 April 1939 |lang=de |page=229 [pdf 32] |url=https://archive.org/details/leseprobe-flugsport-1939/page/n31/mode/1up}} The Hitachi Hatsukaze Model 11 was a Japanese licensed version.
Applications
Specifications (HM 504 A-2)
{{pistonspecs
|
|ref=Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944,{{cite book |last=Schneider |first=Helmut (Dipl.Ing.) |title=Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 |date=1944 |publisher=Herm. Beyer Verlag |location=Leipzig |isbn=381120484X |edition=Facsimile reprint 1986 |language=German |page=396}} Der Flugmotor. Bauteile und Baumuster{{cite book |last1=Katz |first1=Hans (Dr.Ing) |title=Der Flugmotor. Bauteile und Baumuster. Luftfahrt Lehrbücherei Band 7 |date=1940 |publisher=de Gruyter |location=Berlin}}
|type=4-cylinder air-cooled inverted inline
|bore={{cvt|105|mm|2}}
|stroke={{cvt|115|mm|2}}
|displacement={{cvt|3.980|L|cuin|2}}
|length={{cvt|945|mm|1}}
|diameter=
|width= {{cvt|520|mm|1}}
|height={{cvt|780|mm|1}}
|weight={{cvt|107|kg|0}} dry, unequipped
::::{{cvt|124|kg|0}} wet, equipped
|valvetrain=1 inlet and 1 exhaust under-valve per cylinder driven by pushrods and rockers
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=80 Octane
|oilsystem=dry sump, pressure feed with scavenge
|coolingsystem=air-cooled
|power=
:*{{cvt|105|PS|hp kW|0}} at 2,530 rpm (5 minutes) at sea level
:*{{cvt|95|PS|hp kW|0}} at 2,450 rpm (30 minutes) at sea level
:*{{cvt|85|PS|hp kW|0}} at 2,360 rpm (max. continuous / cruise) at sea level
|specpower={{cvt|26.35|PS/L|hp/cuin kW/L|2}}
|compression=6.2:1
|fuelcon=
|specfuelcon={{cvt|0.228|kg/PSh|lb/hph kg/kWh|3}} at max continuous
|oilcon={{cvt|0.002|-|0.003|kg/PSh|lb/hph kg/kWh|3}} at max continuous
|power/weight={{cvt|0.98|PS/kg|hp/lb kW/kg}}
- B.M.E.P.: {{cvt|9.37|atm|bar psi}}
}}
See also
{{aircontent
|see also=
|related=
|lists=
|similar engines=
- Alfa Romeo 110
- Argus As 8
- Blackburn Cirrus Minor
- de Havilland Gipsy Minor
- Elizalde Tigre IV
- Menasco Pirate
}}
References
{{Commons category}}
{{reflist}}
External links
- [http://www.hirth-engines.de Göbler-Hirthmotoren Company website (nothing in there about pre-war engines)]
{{Hirth aeroengines}}
Category:Hirth aircraft engines
Category:Air-cooled aircraft piston engines