Hirth HM 506
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 engine for light aircraft of the 1930s to 1940s and powered the Bücker Bü 133A model trainer. The engine featured a cast magnesium alloy crankcase.
|Type||Inline piston engine|
|Manufacturer||Hirth Motoren GmbH|
|Major applications||Bücker Bü 133|
Specifications (HM 506)
Data from Grey 1972, p. 60d-61d
- Type: 6-cylinder air-cooled inverted inline
- Bore: 105 mm (4.13 in)
- Stroke: 115 mm (4.53 in)
- Displacement: 5.976 L (364.7 cu in)
- Length: 1,276 mm (49.8 in)
- Width: 490 mm (19.1 in)
- Height: 735 mm (28.66 in)
- Dry weight: 149 kg (328 lbs)
- Valvetrain: 1 inlet and 1 exhaust valve per cylinder, operated by push-rods and rockers
- Fuel system: 2 Sum down draught carburetters, automatic mixture control and suitable for inverted flight. Twin Bosch magnetos.
- Oil system: Fresh oil, metered for each cylinder. Rockers in oil bath.
- Cooling system: air
- Power output: 160 hp
- Compression ratio: 6:1
- Gunston 1989, p.77.