Main Menu

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 1930-40's and powered the Bücker Bü 133A model trainer. The engine featured a cast magnesium alloy crankcase.


Bücker Bü 133 A
Fieseler Fi 98 (prototype)
Fieseler Fi 99
Fieseler Fi 157 (UAV prototype)
Fieseler Fi 158 (UAV prototype)
Gotha Go 241
Klemm Kl 35 B (D-ERLQ)


HM 506
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



Copyright © 2021 all-aero. All Rights Reserved.
Joomla! is Free Software released under the GNU General Public License.