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m Robot - Speedily moving category Aircraft piston engines 1920-1929 to Category:Aircraft piston engines 1920–1929 per CFDS.
 
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{{Short description|1920s German aircraft piston engine}}
{{otheruses}}

<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
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{|{{Infobox Aircraft Begin
{|{{Infobox Aircraft Begin
|name = BMW X
|name = BMW X
|image = File:BMW X Flugwerft Schleissheim.jpg
|image =
|caption =BMW X at the [[Deutsches Museum Flugwerft Schleissheim]]
|caption =
}}{{Infobox Aircraft Engine
}}{{Infobox Aircraft Engine
|type=[[Radial engine]]
|type=[[Radial engine]]
|manufacturer=[[BMW]]
|manufacturer=[[BMW]]
|national origin=
|national origin=
|first run={{avyear|1927}}
|first run=1927
|major applications=
|major applications=
|number built =
|number built =
Line 21: Line 20:
|}
|}


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 '''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 [[engine displacement|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.<ref>Gunston 1989, p.25.</ref>
The successor model to the BMW X five-cylinder radial engine, the BMW Xa, was introduced in 1931, with the [[engine displacement|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.<ref name="Gunston">{{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}}</ref>


==Variants==
==Variants==
;X:Bore:{{cvt|83|mm}}, Stroke:{{cvt|80|mm}}<ref name=JAWA1931>{{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}}</ref>
* '''X'''
;Xa:Bore:{{cvt|90|mm}}, Stroke:{{cvt|92.5|mm}}<ref name=JAWA1931/>
* '''Xa'''


==Applications==
==Applications==
* [[BFW M.23]]
* [[BFW M.23]]
* [[BFW M.31]]
* [[BFW M.31]]
* [[Gerner G.IIR]]
* [[Klemm L25]]
* [[Klemm L25]]


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<!-- If you do not understand how to use this template, please ask at [[Wikipedia talk:WikiProject Aircraft]] -->
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|ref=''Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944,<ref name=schneider>{{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}}</ref> and Jane's all the World's Aircraft 1931'' <ref name=JAWA1931/>
|ref=
|type=5 cylinder radial engine
|type=5 cylinder radial engine
|bore=90 mm (3.54 in)
|bore={{cvt|90|mm|2}}
|stroke=92.5 mm (3.64 in)
|stroke={{cvt|90|mm}} / {{cvt|92.5|mm|2}} (slave rods / master rod)
|displacement= 2.94 L (179.6 cuin)
|displacement= {{cvt|2.93|L|cuin|1}} (assumes equal stroke for each cylinder)
|length=
|length={{cvt|664|mm|1}}
|diameter=740mm
|diameter={{cvt|738|mm|1}}
|width=
|width=
|height=
|height=
|weight=73kg
|weight={{cvt|73|kg|0}}
|valvetrain=1x inlet and exhaust overhead valves per cylinder operated by pushrods and rockers
|valvetrain=
|supercharger=
|supercharger=
|turbocharger=
|turbocharger=
|fuelsystem=carburettor
|fuelsystem=Sum CFV 36 carburettor
|fueltype=
|fueltype=73 Octane / 80 Octane
|oilsystem=
|oilsystem=
|coolingsystem=Air cooled
|coolingsystem=Air cooled
|power=51 kW (68 hp)
|power=<br>
:*{{cvt|68|PS|hp kW|0}} at 2,300 rpm (15 minutes) at sea level
|specpower=
:*{{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
|compression=5.7:1
|fuelcon=
|fuelcon=
|specfuelcon=
|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
|oilcon=
|power/weight=
|power/weight={{cvt|0.74|PS/kg|hp/lb kW/kg}}
|designer=
|designer=
|reduction_gear=
|reduction_gear=
|general_other=
|general_other=
|components_other=
|components_other=
|performance_other=
|performance_other='''B.M.E.P.:''' {{cvt|8.4|atm|bar psi}}
}}
}}


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|similar engines=
|similar engines=
* [[Armstrong Siddeley Genet]]
* [[Armstrong Siddeley Genet]]
* [[Warner Scarab Jr]]
* [[Warner Scarab Junior]]
<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
}}
}}


==References==
==References==
===Notes===
{{reflist}}
{{reflist}}

===Bibliography===
==Further reading==
{{refbegin}}
*{{cite book |last1=Jakobs |first1=Fred |last2=Kröschel |first2=Robert|last3=Pierer |first3= Christian|title=BMW aero engines milestones in aviation from the beginnings to the present |publisher=Heel |isbn=978-3-86852-214-3 |date=2009}}
* 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
{{refend}}


==External links==
==External links==
{{Commons category}}
* [http://www.bmw-grouparchives.com/2/showimage.php?coc=1&src=wm.php?org=/data/images/image/804/00011930_m.jpg Image of BMW X and Klemm L-25]
*[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]


{{BMW aeroengines}}
{{BMW aeroengines}}
{{Aviation lists}}


[[Category:BMW aircraft engines|X]]
[[Category:BMW aircraft engines|X]]
[[Category:Aircraft piston engines 1920–1929]]
[[Category:1920s aircraft piston engines]]

{{Aeroengine-specs}}

[[it:BMW X]]

Latest revision as of 20:47, 5 December 2022

BMW X
BMW X at the Deutsches Museum Flugwerft Schleissheim
Type Radial engine
Manufacturer BMW
First run 1927

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 2.2 L (130 cu in) to 2.9 L (180 cu in). Power output went up from 37 to 51 kW (50 to 68 hp). The Xa was also not built in any quantity and was mainly installed in training and sport aircraft.[1]

Variants

[edit]
X
Bore:83 mm (3.3 in), Stroke:80 mm (3.1 in)[2]
Xa
Bore:90 mm (3.5 in), Stroke:92.5 mm (3.64 in)[2]

Applications

[edit]

Specifications (BMW Xa)

[edit]

Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944,[3] and Jane's all the World's Aircraft 1931 [2]

General characteristics

  • Type: 5 cylinder radial engine
  • Bore: 90 mm (3.54 in)
  • Stroke: 90 mm (3.5 in) / 92.5 mm (3.64 in) (slave rods / master rod)
  • Displacement: 2.93 L (178.8 cu in) (assumes equal stroke for each cylinder)
  • Length: 664 mm (26.1 in)
  • Diameter: 738 mm (29.1 in)
  • Dry weight: 73 kg (161 lb)

Components

  • Valvetrain: 1x inlet and exhaust overhead valves per cylinder operated by pushrods and rockers
  • Fuel system: Sum CFV 36 carburettor
  • Fuel type: 73 Octane / 80 Octane
  • Cooling system: Air cooled

Performance

  • Power output:
  • 68 PS (67 hp; 50 kW) at 2,300 rpm (15 minutes) at sea level
  • 60 PS (59 hp; 44 kW) at 1,590 rpm (30 minutes) at sea level
  • 54 PS (53 hp; 40 kW) at 1,980 rpm (max continuous) at sea level
  • 40 PS (39 hp; 29 kW) at 1,980 rpm (max continuous) at 3,500 m (11,483 ft)

See also

[edit]

Comparable engines

Related lists

References

[edit]
  1. ^ Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). P. Stephens. p. 25. ISBN 1-85260-163-9.
  2. ^ a b c Grey, C.G., ed. (1931). Jane's all the World's Aircraft 1931. London: Sampson Low, Marston & company, ltd. p. 50d.
  3. ^ Schneider, Helmut (Dipl.Ing.) (1944). Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 (in German) (Facsimile reprint 1986 ed.). Leipzig: Herm. Beyer Verlag. p. 364. ISBN 381120484X.

Further reading

[edit]
  • Jakobs, Fred; Kröschel, Robert; Pierer, Christian (2009). BMW aero engines milestones in aviation from the beginnings to the present. Heel. ISBN 978-3-86852-214-3.
[edit]
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