# ABC Scorpion

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{{Short description|1920s British piston aircraft engine}}
<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. -->
{{Use dmy dates|date=March 2018}}
{{Use British English|date=March 2018}}
{{infobox aero engine
 |name = Scorpion
 |image = File:ABC Scorpion I.jpg      
 |caption = ABC Scorpion I on display at the [Shuttleworth Collection](/source/Shuttleworth_Collection)
 |engine_type = [Flat-twin](/source/Flat-twin) [aero engine](/source/Aircraft_engine)
 |national_origin = United Kingdom
 |manufacturer = [ABC Motors](/source/ABC_Motors)
 |designer = [Granville Bradshaw](/source/Granville_Bradshaw)
 |first_run =1921
 |major_applications =
 |produced =
 |number_built =
 |developed_from =
 |variants_with_their_own_articles =
}}

The '''ABC Scorpion''' is a 30&nbsp;hp (22&nbsp;kW) two-cylinder [aero engine](/source/Aircraft_engine) designed by British engineer [Granville Bradshaw](/source/Granville_Bradshaw) for use in light aircraft. The engine was built by [ABC Motors Limited](/source/ABC_Motors) and first ran in 1921.<ref>Gunston 1989, p.9.</ref>

==Variants==
;Scorpion I
:1923, 30 hp (22 kW)
;Scorpion II
:1924, 34 hp (25 kW), increased bore and stroke.

==Applications==
[[File:ABCScorpion.JPG|thumb|Scorpion II installed in an [ANEC II](/source/ANEC_I) at the [Shuttleworth Collection](/source/Shuttleworth_Collection)]]
{{colbegin}}
* [ABC Robin](/source/ABC_Robin)
* [Boulton Paul Phoenix](/source/Boulton_Paul_Phoenix)<!-- Type P.41 -->
* [BFW M.19](/source/BFW_M.19)
* [BFW M.23](/source/BFW_M.23)
* [Comper Swift](/source/Comper_Swift)
* [de Havilland Humming Bird](/source/de_Havilland_Humming_Bird)
* [Farman Moustique](/source/Farman_Moustique)
* [Hawker Cygnet](/source/Hawker_Cygnet)
* [Heath Parasol](/source/Heath_Parasol)
* [Hendy Hobo](/source/Hendy_Hobo)
* [Henderson-Glenny Gadfly](/source/Henderson-Glenny_Gadfly)
* [Kay Gyroplane](/source/Kay_Gyroplane)
* [Luton Minor](/source/Luton_Minor)
* [Mignet HM.14](/source/Mignet_HM.14) ''Pou-du-Ciel''
* [Parmentier Wee Mite](/source/Parmentier_Wee_Mite)
* [Peyret-Mauboussin PM X](/source/Peyret-Mauboussin_PM_X)
* [RWD 1](/source/RWD_1)
* [SAI KZ I](/source/SAI_KZ_I)
* [Saynor & Bell Canadian Cub](/source/Saynor_%26_Bell_Canadian_Cub)
* [Short Satellite](/source/Short_Satellite)
* [Snyder Buzzard](/source/Snyder_Buzzard)
* [Udet U 7 Kolibri](/source/Udet_U_7_Kolibri)
* [Wheeler Slymph](/source/Wheeler_Slymph){{citation needed|date=January 2011}}
* [Westland Woodpigeon](/source/Westland_Woodpigeon)
{{colend}}

==Survivors==
The only [ANEC II](/source/ANEC_I) ([''G-EBJO''](/source/Aircraft_registration)) flies regularly at the [Shuttleworth Collection](/source/Shuttleworth_Collection) at [Old Warden](/source/Old_Warden) and is powered by a Scorpion II.

==Specifications (Scorpion I)==
{{pistonspecs
|ref=''Lumsden'' <ref>Lumsden 2003, p.54.</ref>
|type=2 cylinder air cooled flat-twin
|bore=3.6 in (87.5 mm)
|stroke=3.7 in (91.5 mm)
|displacement=73.32 cu in (1.1 L)
|length=
|diameter=
|width=
|height=
|weight=90 lb (41 kg)
|valvetrain= [Overhead valve](/source/Overhead_valve), two valves per cylinder
|supercharger=
|turbocharger=
|fuelsystem= Carburettor
|fueltype=74 [Octane](/source/Octane) petrol
|oilsystem=
|coolingsystem=Air
|power=30 hp (22 kW) at 2,750 rpm
|specpower=
|compression=4:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight= 0.33 hp/lb (0.53 kW/kg)
}}

==See also==
{{aircontent
<!-- other related articles that have not already linked: -->
|see also=

<!-- designs which were developed into or from this aircraft: -->
|related=

<!-- aircraft that are of similar role, era, and capability this design: -->
|similar aircraft=

<!-- relevant lists that this aircraft appears in: -->
|lists=
* [List of aircraft engines](/source/List_of_aircraft_engines)

<!-- For aircraft engine articles.  Engines that are of similar to this design: -->
|similar engines=
* [Aeronca E-113](/source/Aeronca_E-113)
* [Armstrong Siddeley Ounce](/source/Armstrong_Siddeley_Ounce)
* [Bristol Cherub](/source/Bristol_Cherub)
* [Haacke HFM-2](/source/Haacke_HFM-2)
* [Walter Atom](/source/Walter_Atom)
<!-- See [WP:Air/PC](/source/WP%3AAir%2FPC) for more explanation of these fields. -->
}}

==References==
{{Commons category}}

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

===Bibliography===
{{refbegin}}
* Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}
* Guttery, T.E. ''The Shuttleworth Collection''. London: Wm. Carling, 1969. {{OCLC|19614929}}
* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. {{ISBN|1-85310-294-6}}.
{{refend}}

{{ABC aero engines}}

{{DEFAULTSORT:Abc Scoprion}}
Scorpion
Category:1920s aircraft piston engines
Category:Flat-twin engines
Category:Air-cooled aircraft piston engines

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Adapted from the Wikipedia article [ABC Scorpion](https://en.wikipedia.org/wiki/ABC_Scorpion) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/ABC_Scorpion?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.