BMW X (engine)

{{Infobox Aircraft Begin

|name = BMW X

|image = File:BMW X Flugwerft Schleissheim.jpg

|caption =BMW X at the Deutsches Museum Flugwerft Schleissheim

}}{{Infobox Aircraft Engine

|type=Radial engine

|manufacturer=BMW

|national origin=

|first run=1927

|major applications=

|number built =

|program cost =

|unit cost =

|developed from =

|developed into =

|variants with their own articles =

}}

The BMW X is 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 {{cvt|2.2|L|cuin}} to {{cvt|2.9|L|cuin}}. Power output went up from {{cvt|50|to|68|hp|order=flip}}. The Xa was also not built in any quantity and was mainly installed in training and sport aircraft.{{cite book |last1=Gunston |first1=Bill |title=World encyclopaedia of aero engines |year=1989 |publisher=P. Stephens |isbn=1-85260-163-9 |edition=Fully rev. 2nd |page=25}}

Variants

;X:Bore:{{cvt|83|mm}}, Stroke:{{cvt|80|mm}}{{cite book |title=Jane's all the World's Aircraft 1931 |editor1-last=Grey |editor1-first=C.G. |year=1931 |publisher=Sampson Low, Marston & company, ltd |location=London |page=50d}}

;Xa:Bore:{{cvt|90|mm}}, Stroke:{{cvt|92.5|mm}}

Applications

Specifications (BMW Xa)

{{pistonspecs|

|ref=Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944,{{cite book |last=Schneider |first=Helmut (Dipl.Ing.) |title=Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 |date=1944 |publisher=Herm. Beyer Verlag |location=Leipzig |isbn=381120484X |edition=Facsimile reprint 1986 |language=German |page=364}} and Jane's all the World's Aircraft 1931

|type=5 cylinder radial engine

|bore={{cvt|90|mm|2}}

|stroke={{cvt|90|mm}} / {{cvt|92.5|mm|2}} (slave rods / master rod)

|displacement= {{cvt|2.93|L|cuin|1}} (assumes equal stroke for each cylinder)

|length={{cvt|664|mm|1}}

|diameter={{cvt|738|mm|1}}

|width=

|height=

|weight={{cvt|73|kg|0}}

|valvetrain=1x inlet and exhaust overhead valves per cylinder operated by pushrods and rockers

|supercharger=

|turbocharger=

|fuelsystem=Sum CFV 36 carburettor

|fueltype=73 Octane / 80 Octane

|oilsystem=

|coolingsystem=Air cooled

|power=

:*{{cvt|68|PS|hp kW|0}} at 2,300 rpm (15 minutes) at sea level

:*{{cvt|60|PS|hp kW|0}} at 1,590 rpm (30 minutes) at sea level

:*{{cvt|54|PS|hp kW|0}} at 1,980 rpm (max continuous) at sea level

:*{{cvt|40|PS|hp kW|0}} at 1,980 rpm (max continuous) at {{cvt|3500|m|0}}

|specpower={{cvt|23.2|PS/L|hp/cuin kW/L}}

|compression=5.7:1

|fuelcon=

|specfuelcon={{cvt|0.24|kg/PSh|lb/hph kg/kWh}} at max continuous

|oilcon={{cvt|0.005|kg/PSh|lb/hph kg/kWh}} at max continuous

|power/weight={{cvt|0.74|PS/kg|hp/lb kW/kg}}

|designer=

|reduction_gear=

|general_other=

|components_other=

|performance_other=B.M.E.P.: {{cvt|8.4|atm|bar psi}}

}}

References

External links

[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=616833 BMW X on the test rig]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=657095 Klemm L 25 sports aircraft with BMW X or BMW Xa engine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=617204 BMW X]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=657026 Klemm L 25 sports aircraft with BMW X or BMW Xa aeroengine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=657120 Klemm L 25 sports aircraft with BMW X or BMW Xa aeroengine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=656981 Klemm L 25 sports aircraft with BMW X or BMW Xa engine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=657003 Klemm L 25 sports aircraft with BMW X or BMW Xa engine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=657170 Klemm L 25 sports aircraft with BMW X or BMW Xa engine]
[https://www.bmw-grouparchives.com/research/detail/index.xhtml?id=3867216 BMW X]

X

Category:1920s aircraft piston engines