Hirth HM 500
The Hirth HM 500 is a German aircraft engine from the Second World War .
development
The HM 500 appeared in 1939 as a further development of the four-cylinder in - line engine HM 504 . Its construction with unit cylinders, crank drive and control was adopted. The mold was changed the crankcase of electron having a closed tunnel shape with pressed-in bearing rings for crank and camshaft received. This design ensured shorter production and installation times, but in contrast to the split crankshaft with Hirth serration used in the predecessor, it complicated access for maintenance work. The HM 500 was in production throughout the Second World War and was used in particular in some variants of the Bü 181 Bestmann training aircraft, which was built in large series . A six-cylinder version also presented in 1939 was given the designation HM 501 , but was not built in any significant numbers.
construction
The HM 500 is an air-cooled four-cylinder, four- stroke in-line engine with cylinders that are suspended in a single row .
use
Technical specifications
| Parameter | Data (Hirth HM 500 A) |
|---|---|
| length | 981 mm |
| width | 440 mm |
| height | 686 mm |
| drilling | 105 mm |
| Hub | 115 mm |
| Cylinder displacement | 1 l |
| Total displacement | 4.0 l |
| compression | 6.2 |
| Starting power | 105 PS (77 kW) at 2530 rpm |
| Continuous performance on the ground |
85 hp (63 kW) at 2360 rpm |
| Dry weight | 107 kg |
| Power to weight ratio | 1.0 kg / hp |
| Displacement | 26.2 hp / l |
| Fuel consumption for travel services |
228 g / PSh |
literature
- Kyrill von Gersdorff, Kurt Grasmann: aircraft engines and jet engines . In: German aviation . Bernard & Graefe, Munich 1981, ISBN 3-7637-5272-2 , pp. 124 and 128 .
- Heinz J. Nowarra: The German Air Armament 1933-1945 . tape 4 . Bernard & Graefe, Koblenz 1993, ISBN 3-7637-5468-7 , pp. 101 .
