Fairey Swordfish

The Fairey Swordfish is a biplane torpedo bomber, designed by the Fairey Aviation Company. Originating in the early 1930s, the Swordfish, nicknamed "Stringbag", was principally operated by the Fleet Air Arm of the Royal Navy. It was also used by the Royal Air Force (RAF), as well as several overseas operators, including the Royal Canadian Air Force (RCAF) and the Royal Netherlands Navy. It was initially operated primarily as a fleet attack aircraft. During its later years, the Swordfish was increasingly used as an anti-submarine and training platform. The type was in frontline service throughout the Second World War.

Despite being representative of early 1930s aircraft design and teetering on the edge of becoming outdated (in comparison to some alternatives), the Swordfish achieved some spectacular successes during the war. Notable events included sinking one battleship and damaging two others of the Regia Marina (the Italian navy) during the Battle of Taranto, and the famous attack on the German battleship Bismarck, which contributed to her eventual demise. Swordfish sank a greater tonnage of Axis shipping than any other Allied aircraft during the war. The Swordfish remained in front-line service until V-E Day, having outlived some of the aircraft intended to replace it.

In 1933 Fairey, having established a proven track record in the design and construction of naval aircraft, commenced development of an entirely new three-seat naval aircraft, intended for the twin roles of aerial reconnaissance and torpedo bomber. Receiving the internal designation of T.S.R. I, standing for Torpedo-Spotter-Reconnaissance I, the proposed design adopted a biplane configuration and a single 645 hp Bristol Pegasus IIM radial engine as its powerplant. The company chose initially to pursue development of the project as a self-financed private venture while both customers and applicable requirements for the type were sought. Development of the T.S.R. I was in parallel to Fairey's activities upon Air Ministry Specification S.9/30, for which the company was at one point developing a separate but broadly similar aircraft, powered by a Rolls-Royce Kestrel engine instead as well as employing a differing fin and rudder configuration.

Significant contributions to the T.S.R.I's development came from Fairey's independent design work on a proposed aircraft for the Greek Naval Air Service, which had requested a replacement for their Fairey IIIF Mk.IIIB aircraft, and from specifications M.1/30 and S.9/30, which had been issued by the British Air Ministry. Fairey promptly informed the Air Ministry of its work for the Greeks, whose interest had eventually waned, and proposed its solution to the requirements for a spotter-reconnaissance plane ("spotter" referring to the activity of observing and directing the fall of a warship's gunfire). In 1934, the Air Ministry issued the more advanced Specification S.15/33, which formally added the torpedo bomber role.

On 21 March 1933, the prototype T.S.R. I, F1875, conducted its maiden flight from Great West Aerodrome, Heathrow, piloted by Fairey test pilot Chris Staniland. F1875 performed various flights, including several while re-engined with an Armstrong Siddeley Tiger radial engine before it was refitted with the Pegasus engine again, was used to explore the flight envelope, and to investigate the aircraft's flight characteristics. On 11 September 1933, F1875 was lost during a series of spinning tests in which it became unable to recover; the pilot survived the incident. Prior to this, the prototype had exhibited favourable performance, which contributed to the subsequent decision to proceed with the more advanced T.S.R II prototype, which had been specifically developed to conform with the newly issued Specification S.15/33.

On 17 April 1934, the prototype T.S.R II, K4190, performed its maiden flight, flown by Staniland. In comparison with the previous prototype, K4190 was equipped with a more powerful model of the Pegasus engine, an additional bay within the rear fuselage to counteract spin tendencies, and the upper wing was slightly swept back to account for the increased length of the fuselage; along with other aerodynamic-related tweaks to the rear of the aircraft. During the ensuing flight test programme, K4190 was transferred to Fairey's factory in Hamble-le-Rice, Hampshire, where it received a twin-float undercarriage in place of its original land-only counterpart; on 10 November 1934, the first flight of K4190 in this new configuration was performed. Following successful water-handling trials, K4190 conducted a series of aircraft catapult and recovery tests aboard the battlecruiser HMS Repulse. K4190 was later restored to its wheeled undercarriage prior to an extensive evaluation process by the Aeroplane and Armament Experimental Establishment at RAF Martlesham Heath.

In 1935, following the successful completion of testing at Martlesham, an initial pre-production order for three aircraft was placed by the Air Ministry; it was at this point that the T.S.R II received the name Swordfish. All three pre-production aircraft were powered by the Pegasus IIIM3 engine, but adopted a three-bladed Fairey-Reed propeller in place of the two-bladed counterpart used on the earlier prototype. On 31 December 1935, the first pre-production Swordfish, K5660, made its maiden flight. On 19 February 1936, the second pre-production aircraft, K5661, became the first to be delivered; the final pre-production aircraft, K5662, was completed in the floatplane configuration and underwent water-based service trials at the Marine Aircraft Experimental Establishment at Felixstowe, Suffolk.