{{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 |engine_type = Flat-twin aero engine |national_origin = United Kingdom |manufacturer = ABC Motors |designer = 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 designed by British engineer Granville Bradshaw for use in light aircraft. The engine was built by ABC Motors Limited 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 at the Shuttleworth Collection]] {{colbegin}} * ABC Robin * Boulton Paul Phoenix<!-- Type P.41 --> * BFW M.19 * BFW M.23 * Comper Swift * de Havilland Humming Bird * Farman Moustique * Hawker Cygnet * Heath Parasol * Hendy Hobo * Henderson-Glenny Gadfly * Kay Gyroplane * Luton Minor * Mignet HM.14 ''Pou-du-Ciel'' * Parmentier Wee Mite * Peyret-Mauboussin PM X * RWD 1 * SAI KZ I * Saynor & Bell Canadian Cub * Short Satellite * Snyder Buzzard * Udet U 7 Kolibri * Wheeler Slymph{{citation needed|date=January 2011}} * Westland Woodpigeon {{colend}}

==Survivors== The only ANEC II (''G-EBJO'') flies regularly at the Shuttleworth Collection at 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, two valves per cylinder |supercharger= |turbocharger= |fuelsystem= Carburettor |fueltype=74 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=

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<!-- relevant lists that this aircraft appears in: --> |lists= * List of aircraft engines

<!-- For aircraft engine articles. Engines that are of similar to this design: --> |similar engines= * Aeronca E-113 * Armstrong Siddeley Ounce * Bristol Cherub * Haacke HFM-2 * Walter Atom <!-- See WP:Air/PC 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