Hirth HM 512

Last updated
HM 512
TypeAir-cooled inverted V-12 piston engine
National origin Germany
ManufacturerHirth-Motoren G.m.b.H, Stuttgart
Designer Hellmuth Hirth
Number builtsmall numbers [1]
Developed from Hirth HM 506

The Hirth HM 512 was a 12-cylinder development of the earlier, 6-cylinder HM 506, produced in the late 1930s. Both were supercharged, inverted V, air-cooled engines. [2]

Contents

Design and development

The HM 512 shared the same bore and stroke (105 mm × 115 mm) and 6:1 compression ratio with the rest of the HM500 series air-cooled engines. Other shared features were Hirth's use of roller bearings in the crankshaft and at both ends of connecting rods. The crankshaft was of typical Hirth multipart design, the 12-cylinders requiring 7 roller bearings. Like the HM 508, the drive was geared down by 1:1.5. [3]

Variants

HM 512A
Initial version; take off power 400 hp (300 kW), continuous 360 hp (270 kW)
HM 512B
Take off power 450 hp (335 kW), continuous 360 hp (270 kW) [3]

Applications

Specifications (HM 512A)

Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944, [4] Jane's all the World's Aircraft 1938 [3]

General characteristics

314 kg (692 lb) wet, equipped

Components

Performance

  • 400 PS (395 hp; 294 kW) at 3,110 rpm (1 minute) at sea level
  • 360 PS (355 hp; 265 kW) at 3,000 rpm (5 minutes) at sea level
  • 330 PS (325 hp; 243 kW) at 2,910 rpm (30 minutes) at sea level
  • 300 PS (296 hp; 221 kW) at 2,810 rpm (max. continuous) at sea level

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References

  1. Gunston 1989, pp. 76–7
  2. Pearce, William. "FKFS Gruppen-Flugmotor A, C, and D". oldmachinepress.com. Retrieved 8 May 2016.
  3. 1 2 3 Grey, C.G.; Bridgman, Leonard, eds. (1938). Jane's all the World's Aircraft 1938. London: Sampson Low, Marston & company, ltd. p. 61d.
  4. 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. pp. 402–403. ISBN   381120484X.

Works cited