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The BMW X was a small five-cylinder radial engine for sport and training aircraft first run in 1927. Although this engine proved successful at several large-scale events in 1930, including that year's round-Europe flight, only a few were built.

The successor model to the BMW X five-cylinder radial engine, the BMW Xa, was introduced in 1931, with the swept volume increased from 2.2 to 2.9 liters. Power output went up from 50 to 68 hp. The Xa was also not built in any quantity either, and was mainly installed in training and sports aircraft.

BFW M.23
BFW M.31
Klemm L25

Type: 5 cylinder radial engine
Bore: 90 mm (3.54 in)
Stroke: 92.5 mm (3.64 in)
Displacement: 2.94 L (179.6 cuin)
Diameter: 740mm
Dry weight: 73kg
Fuel system: carburettor
Cooling system: Air cooled
Power output: 51 kW (68 hp)
Compression ratio: 5.7:1



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