# ABC Gnat

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<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. -->
{{Use dmy dates|date=January 2018}}
{{Use British English|date=January 2018}}
{{infobox aero engine
 |name = Gnat
 |image = 
 |caption = 
 |engine_type = [Flat-twin](/source/Flat-twin) [aero engine](/source/Aircraft_engine)
 |national_origin = United Kingdom
 |manufacturer = [ABC Motors Limited](/source/ABC_Motors)
 |designer = [Granville Bradshaw](/source/Granville_Bradshaw)
 |first_run =1916
 |major_applications = 
 |produced =  
 |number_built = 17
 |developed_from =
 |variants_with_their_own_articles =
}}

The '''ABC Gnat''' was a 45&nbsp;hp (34&nbsp;kW) two-cylinder [aero engine](/source/Aircraft_engine) designed by British engineer [Granville Bradshaw](/source/Granville_Bradshaw) for use in light aircraft. The Gnat was built by [ABC Motors](/source/ABC_Motors), first running in 1916, production ceased in December 1918. 17 engines were built from an original order of 18.<ref>Lumsden 2003, p.51.</ref>

==Applications==
*[BAT Crow](/source/BAT_Crow)
*[Blackburn Sidecar](/source/Blackburn_Sidecar)
*[Eastchurch Kitten](/source/Port_Victoria_P.V.8)
*[Grain Kitten](/source/Port_Victoria_P.V.7)
*[Loening M-2 Kitten](/source/Loening_M-2_Kitten)
*[Macchi M.16](/source/Macchi_M.16)G
*[Royal Flying Corps ‘Aerial Target’](/source/R.F.C._World_War_I_Drone_Weapons)<ref>Professor A. M. Low FLIGHT, 3 October, 1952 page 436 “The First Guided Missile”</ref>
*[Sopwith Sparrow](/source/Sopwith_Sparrow)
*[Sopwith Tadpole](/source/Sopwith_Tadpole)

==Specifications (Gnat I)==
{{pistonspecs
|ref=Lumsden<ref>Lumsden 2003, p.276.</ref> 
|type=2-cylinder air-cooled flat-twin
|bore=4.33 in (110&nbsp;mm)
|stroke=4.72 in (120&nbsp;mm) 
|displacement=139.06 cu in (2.28 L)
|length=
|diameter=
|width=
|height=
|weight=115 lb (52&nbsp;kg)
|valvetrain= [Overhead valve](/source/Overhead_valve), two valves per cylinder
|supercharger=
|turbocharger=
|fuelsystem= Single A.B.C. carburettor
|fueltype=Petrol (40-50 [Octane rating](/source/Octane_rating))
|oilsystem=
|coolingsystem=Air-cooled
|power=45&nbsp;hp (34 kW) at 1,920&nbsp;rpm (takeoff power) 
|specpower=0.32&nbsp;hp/cu in (14.9 kW/L)
|compression=3.8:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight= 0.4&nbsp;hp/lb (0.6 kW/kg)
}}

==See also==
{{aircontent
<!-- other related articles that have not already linked: -->
|see also=
*[ABC motorcycles](/source/ABC_motorcycles)
<!-- 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=
*[Armstrong Siddeley Ounce](/source/Armstrong_Siddeley_Ounce)
*[Bristol Cherub](/source/Bristol_Cherub)
*[Walter Atom](/source/Walter_Atom)
<!-- See [WP:Air/PC](/source/WP%3AAir%2FPC) for more explanation of these fields. -->
}}

==References==

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

===Bibliography===
{{refbegin}}
* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. {{ISBN|1-85310-294-6}}.
{{refend}}

==External links==

{{ABC aero engines}}

{{DEFAULTSORT:Abc Gnat}}
Category:1910s aircraft piston engines
Gnat
Category:Flat-twin engines

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