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  • Armstrong Whitworth Siskin Fighter / Fighter-Bomber

    The Armstrong Siskin biplane fighter enjoyed success between wars in service primarily with the United Kingdom and Canada.

     Updated: 4/29/2015; Authored By Dan Alex; Content ¬©www.MilitaryFactory.com

    The Armstrong Whitworth Siskin (a siskin being a smallish yellow-tinged finch) was the primary air mount of many-a-Royal Air Force pilot in her heyday. She represented one of the earliest aircraft designs for the British in the post-war world (following World War 1) and became the nation's first "all-metal" fighter. She proved a capable fighter aircraft throughout the 1920's and even stood for a time in the 1930's before being replaced by more modern implements. The aircraft served with a few nations overseas and became a popular acrobatic platform and racer during aviations "golden years" of the 1920's.


    Origins of the Siskin can be traced back to the RAF Specification Type 1 requiring the development of a capable single-seat fighter to utilize the overly optimistic ABC Dragonfly radial piston engine of 320 horsepower - a product of ABC Motors Limited ("ABC" standing for "All-British engine Company"). The Dragonfly found its own origins as a product developed in the latter years of World War 1. The powerplant proved optimistic in that it promised to deliver excellent performance to push a new generation of fighters to all-new heights. Unfortunately, the Dragonfly proved quite unreliable and temperamental and performed at levels well below the advertised numbers. The engine was ultimately cancelled when all of its deficiencies could not be ironed out in whole.

    The Siskin grew out of the Siddeley-Deasy S.R.2 Siskin aircraft designed by Major F.M. Green. Green served as chief engineer at the Royal Aircraft Factory and had now become a part of the Siddeley-Deasy Motor Car Company. Not limited to the production of motor vehicles, the Siddeley-Deasy brand also delved into manufacture of engines and aircraft. The company was based out of Coventry and was founded by Henry Hugh Peter Deasy. While Deasy left in 1908, J D Siddeley came aboard and changed the company name to Siddeley-Deasy. From there, the company would gradually morph into the Armstrong Whitworth Aircraft firm (known formally as the Sir W.G. Armstrong Whitworth Aircraft Co. Ltd after their 1920 merger with Armstrong Whitworth) and became responsible for a large portion of Siskin production thereafter.

    The initial Siskin of all-wood construction flew with the ill-fated Dragonfly engine for the first time in May of 1919. The aircraft itself proved a capable mount though the engine left much to be desired. As a result, the Armstrong Siddeley Jaguar of 325 horsepower was selected to replace the Dragonfly in future flights of the Siskin. The new Siskin went airborne on March 20th, 1921.

    By this time, the British Air Ministry had made a decision to pursue all-metal fighters for their future needs - the fear being that another war could spell shortages of wood and thusly affect the capability of wood-based fighter production in the UK. As such, the Siskin was redesigned in 1923 to incorporate an all-metal aluminum alloy internal frame. The new design was affixed the designation of Siskin III and flown on May 7th, 1923. The Royal Air Force (RAF) took notice and ordered six such systems for evaluation. Tests were conducted in January of 1924 and proved quite promising to the point that the Siskin III was officially accepted into service with the RAF. The Siskin became the RAFs first all-metal fighter and saw a first-run production total of 64 examples for RAF.

    The Variants

    In all, the Siskin existed in only a handful of variants. There were the three Siddeley Deasy S.R.2 Siskin developmental aircraft which was followed two civilian Siskin II prototypes - the second becoming the prototype fighter model. The series took a change for the better with the arrival of the Siskin III, now an all-metal design, of which 64 were produced for the Royal Air Force.

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    Armstrong Whitworth Siskin IIIA Technical Specifications

    Service Year: 1924
    Type: Fighter / Fighter-Bomber
    National Origin: United Kingdom
    Manufacturer(s): Armstrong Whitworth / Siddeley-Deasy - UK
    Production Total: 465

    Structural (Crew Space, Dimensions and Weights)

    Operating Crew: 1
    Length: 25.33 feet (7.72 meters)
    Width: 33.17 feet (10.11 meters)
    Height: 10.17 feet (3.10 meters)

    Weight (Empty): 2,061 lb (935 kg)
    Weight (MTOW): 3,012 lb (1,366 kg)

    Installed Power and Standard Day Performance

    Engine(s): 1 x Armstrong Siddeley Jaguar IVS engine developing 400 horsepower.

    Maximum Speed: 156 mph (251 kph; 136 knots)
    Maximum Range: 280 miles (450 km)
    Service Ceiling: 27,001 feet (8,230 meters; 5.11 miles)
    Rate-of-Climb: 1,538 feet-per-minute (469 m/min)

    Armament / Mission Payload

    2 x 7.7mm Vickers machine guns

    4 x 20lb bombs held underwing

    Global Operators / Customers

    Canada; Estonia; Sweden; United Kingdom

    Model Variants (Including Prototypes)

    S.R.2 - Siddeley-Deasy 1919 design on which Siskin is based on; all-wood aircraft; three examples produced.

    Siskin II - Civilian Prototype; two examples produced with the second serving as a fighter prototype.

    Mk III - Design recast with fabric-covered aluminum alloy structure (all-metal); 64 examples produced; fitted with Jaguar III 325hp engine.

    Mk IIIA - Fitted with supercharged Jaguar IV of which 348 were produced.

    Mk IIIDC - Dual-Control Pilot Trainer Variant; 53 examples produced.

    Mk IIIB - Experimental Racing Model; single example produced.

    Mk IV - Experimental Racing Model (Civilian); single example produced.

    Mk V - Experimental Racing Model; originally a civilian model intended for Romania until order was cancelled.