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Kawasaki Ha-9


The first twelve-cylinder engine built by the Bayerische Motorenwerke AG, with a 60-degree included angle between the cylinder banks. The BMW VI was developed from the BMW IV by doubling the number of cylinders, through the additional cylinder bank. Series production commenced in 1926 after type approval had been granted. From 1930 on, after 1000 engines of the BMW VI type had already been delivered, Germany was again permitted to construct military aircraft. The sudden additional demand resulted in the production figures increasing rapidly. In 1933 the BMW VI was used for BMW's first experiments with direct fuel injection.

The BMW VI was the chosen source of power for numerous record-breaking and long-distance flights, including an east-to-west crossing of the Atlantic in 1930 and a round-the world flight in 1932, both by Wolfgang von Gronau in an open Dornier Wal flying boat powered by two BMW VI engines.

The BMW VI was put to unusual use as a power unit for the "Rail Zeppelin" high-speed railcar. Many versions of the BMW VI engine were developed, and it was built under license in Japan and the Soviet Union. This was further evidence of the reliability of an engine with which BMW made a fundamental contribution to the build-up of German air transport. At least 9,200 were built between 1926 and 1938.

The engine was license-built in the Soviet Union under the supervision of Mikulin, who then further developed it as the M-17. More license built engines were produced by Kawasaki Heavy Industries in Japan as the Kawasaki Ha-9.

Albatros L 77
Arado Ar 64
Arado Ar 65
Arado Ar 68
Arado SSD I
Dornier Do 10
Dornier Do 17
Focke-Wulf Fw 42
Heinkel He 45
Heinkel He 51
Heinkel He 59
Heinkel He 60
Heinkel He 70
Kawasaki Type 92
Tupolev TB-3 Mikulin M-17

Type: V-12
Bore: 160 mm (6.3 in)
Stroke: 190 mm (7.48 in)
Displacement: 45.84 L (2,797.5 cuin)
Length: 1810 mm (71.26 in)
Width: 859 mm (33.82 in)
Height: 1103 mm (43.43 in)
Dry weight: 510 kg (1124 lb)
Fuel system: 2 x Zenith 60 DCL
Fuel type: min. 87 octane gasoline
Cooling system: Liquid-cooled
Power output: 650 HP 641 hp
Compression ratio: 5.50


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