Hirth HM 60

HM 60
Type	Inline piston engine
Manufacturer	Hirth
First run	June 1923
Major applications	Klemm Kl 25

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, and its sales success contributed to Hirth's rapid pre-war expansion. It was a popular engine for light aircraft delivering 80 hp (60 kW) at 2,300 rpm. Later Hirth engines built upon the HM 60's success and provided greater power with many of the same design features.^[1]

Variants

HM60
HM60R
HM60R-2

Applications

Specifications (HM 60R)

Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944^[2]

General characteristics

Type: 4-cylinder air-cooled inverted in-line aircraft piston engine
Bore: 102 mm (4.02 in)
Stroke: 110 mm (4.33 in)
Displacement: 3.596 L (219.4 cu in)
Length: 840 millimetres (33.1 in)
Width: 390 mm (15.4 in)
Height: 722 mm (28.4 in)
Dry weight: 91 kg (201 lb) dry, unequipped

97 kg (214 lb) wet, equipped

Components

Valvetrain: 1x intake and 1x exhaust under-head valves per cylinder actuated pushrods and rockers
Fuel system: SUM IFH 36 Nr.552 carburetor
Fuel type: 74 octane gasoline
Oil system: Dry sump with one pressure and two scavenge pumps
Cooling system: air-cooled

Performance

Power output:

80 PS (79 hp; 59 kW) at 2,400 rpm (5 minutes) at sea level
72 PS (71 hp; 53 kW) at 2,320 rpm (max. continuous) at sea level
66 PS (65 hp; 49 kW) at 2,240 rpm (cruise) at sea level

Specific power: 22.25 PS/L (0.36 hp/cu in; 16.36 kW/L)
Compression ratio: 5.8:1
Specific fuel consumption: 0.23 kg/PSh (0.514 lb/(hp⋅h); 0.313 kg/kWh) at max continuous
Oil consumption: 0.015 kg/PSh (0.034 lb/(hp⋅h); 0.020 kg/kWh) at max continuous
Power-to-weight ratio: 0.893 PS/kg (0.400 hp/lb; 0.657 kW/kg)
B.M.E.P.: 8.35 atm (8.46 bar; 122.7 psi)

References

^ Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. p. 77. ISBN 978-1-85260-163-8.
^ Schneider, Helmut (Dipl.Ing.) (1944). Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 (in German) (Facsimile reprint 1986 ed.). Leipzig: Herm. Beyer Verlag. p. 392. ISBN 381120484X.

External links

Oldengine.org Archived 2007-08-04 at the Wayback Machine

[gunston-1] Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. p. 77. ISBN 978-1-85260-163-8.

[schneider-2] Schneider, Helmut (Dipl.Ing.) (1944). Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 (in German) (Facsimile reprint 1986 ed.). Leipzig: Herm. Beyer Verlag. p. 392. ISBN 381120484X.

[1]

[2]