Benz Bz III
The Benz Bz III is an aircraft engine from Benz & Cie., Rheinische Automobil- und Motorenfabrik AG . The liquid-cooled six - cylinder in - line engine with a displacement of 14.3 liters and a continuous output of 110 kW (150 hp) was installed in various aircraft belonging to the German Army . Around 3000 units were produced by the end of 1915 before it was replaced by the Benz Bz IV with 162 kW (220 hp) output in 1916 . Also based on the Bz III, the Benz Bz IIIa with 15.2 liter displacement and 135 kW (185 hp) was delivered from August 1917. V-engines with eight and twelve cylinders followed (Benz Bz IIIb, Benz Bz VI).
construction
The lower side of the camshaft actuates the hanging valves via bumpers and rocker arms . The cylinders are arranged individually on the crankcase and have a separate water jacket. Each cylinder has two spark plugs ( double ignition ). The intake air is fed through the crankcase to the two carburettors (Benz FX: one carburetor). The cooling water is circulated with a pump. The ignition system consists of two Bosch magneto igniters .
Kaiser Prize
The Benz Bz III (manufacturer's name: Type FF) emerged from the four-cylinder Benz FX that won the first Kaiser Prize competition for aircraft engines in January 1913 . The basic design features of the Benz FX were also adopted in the following models, with the Benz Bz III only being the result of adding two cylinders to the FX:
Benz Bz I and Benz Bz II
In parallel with the Benz Bz III, the two smaller six-cylinder aircraft engines Benz Bz I with 75 kW (100 hp) and Benz Bz II with 80 kW (110 hp) were developed based on the same design principle.
Further developments
In February 1916, the Benz Bz IV six-cylinder in-line engine was approved. The Bz IV, which is considerably stronger with 30 percent more displacement and four-valve technology, was produced over 6000 times. Only small numbers of the two V-engines Benz IIIb (8 cylinders, as IIIc without propeller transmission ) and VI (12 cylinders) were built (altogether 180 pieces of the types IIIb / IIIc). The Bz VI was used for the first time in the giant Zeppelin Staaken aircraft of the R.XVI series.
Technical specifications
| Benz FX | Bz I | Bz II | Bz III | Bz IIIb | Bz IV | Bz VI | |
|---|---|---|---|---|---|---|---|
| Design | Four-cylinder series | Six-cylinder series | Eight-cylinder V (90 degrees) | Six-cylinder series | Twelve-cylinder V (60 degrees) | ||
| Valves | 2 per cylinder | 3 per cylinder | 4 per cylinder | ||||
| Continuous output | 75 kW (100 PS) |
70 kW (95 PS) | 90 kW (122 hp) | 110 kW (150 PS) |
145 kW (195 hp) |
162 kW (220 PS) |
380 kW (520 hp) |
| Displacement bore × stroke |
9.6 l 130 mm × 180 mm |
7.9 l 106 mm × 150 mm |
10.1 L 116 mm × 160 mm |
14.3 l 130 mm × 180 mm |
13.7 l 125 mm × 140 mm |
18.8 l 145 mm × 190 mm |
45.6 l 175 mm × 190 mm |
| Dry matter | 155 kg | 162 kg | 213 kg | 270 kg | 271 kg | 370 kg | 746 kg |
See also
literature
- Kyrill von Gersdorff, Kurt Grasmann: aircraft engines and jet engines . In: German aviation . tape 2 . Bernard & Graefe, Munich 1981, ISBN 3-7637-5272-2 , pp. 28/29 .
Web links
- Six cylinder Benz aircraft engines type FB FD FF. Retrieved March 17, 2013 (operating instructions).
- 150 hp six-cylinder Benz aircraft engines 1917. February 1917, accessed on March 17, 2013 (operating instructions).
Individual evidence
- ↑ a b Bruno Lange: Type manual of German aviation technology . In: German aviation . tape 9 . Bernard & Graefe, Koblenz 1986, ISBN 3-7637-5284-6 , pp. 284 .