Hirth HM 504 explained

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^{[1] [2]} The Hitachi Hatsukaze Model 11 was a Japanese licensed version.

Applications

• Arado Ar 79
• Bücker Bü 131
• Bücker Bü 181
• BŻ-1 GIL (helicopter)
• Klemm Kl 35
• Matra-Cantinieau MC-101 (helicopter)
• Morane-Saulnier MS.603
• Payen Arbalète
• Repülőgépgyár Levente II

External links

• Göbler-Hirthmotoren Company website (nothing in there about pre-war engines)

Notes and References

1. Book: Gunston, Bill . World Encyclopaedia of Aero Engines . 1989 . Patrick Stephens Limited . Cambridge, England . 978-1-85260-163-8 . 2nd . 77.
2. Werkstoff-Volumenanteile der 'AR' 79 . Materials proportions by volume of the AR 79 (advertising back matter)  . Flugsport . Frankfurt/Main . 31 . 8 . 12 April 1939 . de . 229 [pdf 32] .