BMW X

BMW X
Type	Radial engine
Manufacturer	BMW
First run	1927

The BMW X was a small five-cylinder radial engine for sport and training aircraft. 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.^[1]

Variants

• X
• Xa

Applications

• BFW M.23
• BFW M.31
• Gerner G.IIR
• Klemm L25

Specifications (BMW Xa)

General characteristics

• 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

Components

• Fuel system: carburettor
• Cooling system: Air cooled

Performance

• Power output: 51 kW (68 hp)
• Compression ratio: 5.7:1

See also

Comparable engines

• Armstrong Siddeley Genet
• Warner Scarab Junior

Related lists

• List of aircraft engines

References

Notes

1. Gunston 1989, p.25.

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
• Fred Jakobs, Robert Kröschel and Christian Pierer. "BMW aero engines". BMW Group Classic, 2009 ISBN 978-3-86852-214-3

External links

• Image of BMW X and Klemm L-25