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Armstrong Whitworth F.K.3

From Alfawiki
Armstrong Whitworth Aircraft
IndustryAerospace
Founded1914
FounderFrederick Koolhoven
Headquarters
United Kingdom


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File:Armstrong-Whitworth FK3.jpg
A British aviator, possibly 2nd Lt. A.C. Stopher of No. 47 Squadron RAF, Thessalonika, pictured with an FK.3
File:Armstrong-Whitworth-bulgarian.jpg
Officers and enlisted men of the Bulgarian Air Force gathered around a captured FK.3 in 1917
File:Armstrong Whitworth F.K.3 5519.jpg
Armstrong Whitworth F.K.3 dating from 1915

The Armstrong Whitworth F.K.3 was a British two-seat biplane designed for general-purpose roles, constructed by Armstrong Whitworth Aircraft during the period of World War I. By the conclusion of the conflict, it was deemed outdated for frontline operations.

History

In 1914, Dutch aeronautical engineer Frederick Koolhoven joined Armstrong Whitworth and began designing a series of aircraft bearing his initials in their designations. The F.K.3 was developed following the fundamental configuration of the Royal Aircraft Factory B.E.2c, which Armstrong Whitworth was manufacturing for the Royal Flying Corps. The aim was to enhance the design by simplifying the structure to facilitate easier production. The prototype, piloted by Norman Spratt on its maiden flight, utilized a 70 hp (52 kW) air-cooled Renault 70 hp V-8 engine.[1] This model differed from the B.E.2 by removing welded joints and complex metal fittings in its framework, and incorporating increased dihedral on the upper wing. It maintained the B.E.2's seating arrangement with separate cockpits for the pilot and observer, the latter positioned forward. An initial series of seven aircraft built to this specification,[2] occasionally identified as the F.K.2, were constructed.[3][4][5]

This first batch showed minimal advancement over the BE.2 and was not accepted for deployment in France.[6] Subsequent aircraft were produced to an updated design featuring a redesigned fin and rudder with a straight leading edge, lacking the earlier comma-shaped horn balance, and powered by a more robust Renault-derived 90 hp (67 kW) RAF 1a engine.[1] Both crew members were seated within a single elongated cockpit with the pilot at the front,[1] improving the observer’s ability to operate defensive armament—though only a limited number of F.K.3s were actually equipped with weapons. Evaluation trials conducted at Upavon in May 1916 demonstrated that the F.K.3 outperformed the B.E.2c in certain aspects despite having a reduced useful load capacity. Armstrong Whitworth received an order for 150 units, with an additional 350 manufactured by Hewlett & Blondeau Limited at Luton. Early examples featured twin high exhaust stacks protruding above the upper wing similar to B.E.2s, but these were later replaced by forward-facing ram’s horn exhaust pipes.[7]

During production, a shortage of RAF engines led to twelve aircraft being equipped with heavier and longer 120 hp (90 kW) six-cylinder inline water-cooled Beardmore 120 hp engines instead. To accommodate this additional weight, wingspan was extended by 2 ft (610 mm). Although climb performance improved due to increased power, maximum speed remained largely unaffected; these planes were eventually reverted to RAF engines once supplies normalized.[1]

Operational Service

The F.K.3 was never deployed by frontline RFC squadrons in France, as the more advanced F.K.8 and R.E.8 models were already planned for service. Abroad, only a single unit—the 47 Squadron stationed at Salonika—operated the F.K.3, while the remainder remained within the United Kingdom. The majority of these aircraft served primarily in a training capacity until the arrival of the Avro 504, which superseded them.

Military operators

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Specifications (F.K.3)

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See also

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Notes

  1. ↑ 1.0 1.1 1.2 1.3 Cite error: Invalid <ref> tag; no text was provided for refs named Tapper
  2. ↑ According to Tapper, only the prototype used the Renault engine
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Mason bomber p41
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Bruce RFC p90-3
  5. ↑ Koolhoven site
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Bruce RFC p92-3
  7. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).

Bibliography

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