Hirth HM 506
The Hirth HM 506 is a German aircraft engine of the 1930s produced by Hirth Motoren GmbH in Stuttgart-Zuffenhausen .
commitment
The HM 506 was the six-cylinder version of the largely identical engine series HM 504 , HM 508 and HM 512 . The components of these engines, which included a split crankshaft with Hirth toothing and cylinders with a uniform stroke volume , were designed as a modular system and could thus be combined and exchanged among the individual models. Only a small number of the HM 506 were built in 1934/1935, which were mainly used in the Bü 133 B Jungmeister aerobatic aircraft .
construction
The HM 506 is an air-cooled six-cylinder , four-stroke , in -line engine with suspended cylinders and differs from the four-cylinder version HM 504 only in the structural changes required due to the two additional cylinders. It has a fresh oil - dry sump lubrication and oil recirculating pump . The cylinders are made of gray cast iron with attached heads made of light metal and are connected through tie rods on the crank case of electron secured, the lid serves as an oil reservoir. Each cylinder is equipped with one inlet and one outlet valve, which is controlled by the roller-bearing camshaft via needle-bearing rocker arms, push rods and tappets . The EC pistons are made of Y light metal, the connecting rods with an H-shaped cross-section are made of chrome-nickel steel. The crankshaft with Hirth serration is split and runs on five roller bearings and one radial bearing. The ignition is carried out by a Bosch magneto with electric ignition point adjustment. Two spark plugs are provided per cylinder .
commitment
Technical specifications
| Parameter | Data (Hirth HM 506 A 1) |
|---|---|
| Length over all | 1.26 m |
| Width over everything | 0.49 m |
| Height above everything | 0.74 m |
| drilling | 105 mm |
| Hub | 115 mm |
| Cylinder displacement | 1 l |
| Total displacement | 5.98 l |
| compression | 6.0 |
| Continuous performance on the ground |
130 hp (96 kW) at 2330 rpm |
| Increased continuous output (30 min) on the ground |
145 hp (107 kW) at 2420 rpm |
| Best short performance (5 min) on the ground |
160 PS (118 kW) at 2500 rpm |
| Dry weight | 153 kg without equipment |
| Power to weight ratio | 0.96 kg / hp |
| Displacement | 26.7 hp / l |
| Fuel consumption with continuous power |
225 g / PSh |
| Lubricant consumption at continuous output |
3 g / PSh |
| Octane number | 80 |
literature
- Werner von Langsdorff : Handbook of aviation . Born in 1939. 2nd, unchanged edition. J. F. Lehmann, Munich 1937, p. 527 and 559 .
- Kyrill von Gersdorff, Kurt Grasmann: aircraft engines and jet engines . In: German aviation . Bernard & Graefe, Munich 1981, ISBN 3-7637-5272-2 , pp. 127 .