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...

Hirth HM 504 - 4-cylinder air-cooled inverted inline, 105 hp (78 kW) Hirth HM 506 - 6-cylinder air-cooled inverted inline, 165 hp (123 kW) Hirth HM 508...

The Hirth HM 500 was a German four-cylinder air-cooled inverted inline engine developed from the Hirth HM 504 in 1938. Although developing the same output...

and during World War II. The original Hatsukaze was a license-built Hirth HM 504. Hatsukaze engines were air-cooled, four-cylinder, inverted inline engines...

The Hirth HM 508 was an air-cooled, eight-cylinder, 60° cylinder bank angle inverted-V aircraft engine built in Germany in the 1930s. It had a bore and...

Toku Model 13 piston engine — a license-built version of the German Hirth HM 504 inverted, inline-four cylinder air-cooled engine, with the "model 13"...

The Hirth HM 506 was a six-cylinder air-cooled inverted inline engine that was developed from the earlier four-cylinder HM 504. The HM 506 was a popular...

inline Hirth HM 150 – 8-cylinder air-cooled inline Hirth HM 504 4-cylinder air-cooled inline Hirth HM 506 6-cylinder air-cooled inline Hirth HM 508 8-cylinder...

The Hirth HM 60 was a four-cylinder inverted air-cooled inline aircraft engine designed in 1923 and first sold in 1924. The engine was of very high quality...

reduced to simple skids 1.8 m (71 in) apart. It had a 78 kW (105 hp) Hirth HM-504 engine, enclosed in a long, smooth nosed but partially open sided cowling...