Polish Aviation Museum

31-864 Kraków,
al. Jana Pawła II 39
phone: (12) 640 99 60,
(12) 642 40 70
e-mail: info@muzeumlotnictwa.pl

a cultural institution of the Malopolska Region

Małopolska – Kraków Region

Mecenas Muzeum

Kraków Airport

Instytut Techniczny Wojsk Lotniczych - sponsor restauracji samolotu Caudron  CR.714 Cyclone

Patroni Medialni

Skrzydlata Polska

Aircraft engine: Hirth HM-504A

Hirth HM-504A
inline engine

Configuration4-cylinder inverted inline
Displacement4 l (244 cu in)
Compression ratio6.2
Weight104 kg (229 lb)
Maximum power105 hp at 2,530 RPM
Climb power85 hp at 2,360 RPM

The engine was designed at the Hirth Motoren company in Stuttgart. During 1934–35 Hirth developed a concept of manufacturing different types of engines, varying in respect of the power output and capacity, yet composed of unified elements such as cylinders, crankshaft and timing gear. This conception was very beneficial from the technical and economical point of view. A family of the “500” series engines was developed – versions 504, 506 and 508. In the 504A version the crankcase was cast in electron, leading to reduction in the weight of the engine. It was used in the Bücker Bü 131 Jungmann, Bücker Bü 181 Bestmann and Arado Ar 79 aircraft. Production totalled about 6,000 examples.



Dofinansowano ze środków Ministra Kultury i Dziedzictwa Narodowego
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