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Gloster GA.5 Javelin

 

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Javelin FAW Mk.1


Designed to meet the requirements of Specification F.4/48 for a two-seat twin-engined all-weather interceptor fighter, the Javelin was of tailed-delta configuration and the first of seven prototypes was flown on 26 November 1951. The Javelin suffered a protracted development period, being subjected to delays arising from poor handling qualities and difficulties with integration of the radar.


The third prototype, WT827, had a straight wing and early cockpit canopy. WT830, the fourth prototype, had a revised "cranked" leading edge giving a better fineness ratio over the ailerons, and also the old cockpit and no guns; and WT 836, the fifth prototype, which is to full production standard. This has a more extensive transparency over the rear cockpit with a streamlined fairing behind instead of the former rather abrupt cut-off to the canopy. The fifth prototype also had the standard “cranked" wing and the full armament of four 30 mm cannon mounted just outboard of the angle in the leading edge.


It was not until late 22 July 1954 that the first production specimen made its maiden flight. This was the Javelin FAW.Mk 1, powered by two 3629kg Armstrong Siddeley Sapphire ASSa 6 turbojets and carrying an armament of four 30mm Aden cannon, which began to enter service with No. 46 Squadron in February 1956.

 

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Forty F(AW) Mk Is for the RAF were followed by 30 F(AW) Mk 2s, the first example of this version flying on 31 October 1955.

The FAW.1 was superseded in production by the Javelin FAW.Mk 2 which featured American (APQ 43) interception radar in place of the Brit-ish (AI17) equipment originally fitted. Both of these models were armed with four 30-mm Aden cannon, as was the Javelin FAW.Mk 4 which introduced an all-moving tailplane in an attempt to eliminate excessive stick force requirements when flying at high indicated speeds. First flown on 19 September 1955, differed in having a fully-powered all-moving tailplane, 50 being built.

The F(AW) Mk 4 paralleled production of 21 T Mk 3 dual-control trainers.

Additional fuel capacity in the wings and having provision for four de Havilland Firestreak AAMs was introduced in the Javelin FAW.Mk 5, which was otherwise virtually identical to the Javelin FAW.Mk 4, and both of these variants duly entered service during 1957. Sixty-four F(AW) Mk 5 were built.

The final ‘first-generation’ model was the Javelin FAW.Mk 6, which was basically a Javelin FAW.Mk 5 fitted with American radar. 33 F(AW) Mk 6s were built.


Whilst production of these was progressing, a major redesign effort had been initiated with the objective of installing the rather more powerful 4990kg Sapphire ASSa 7 200 series engine, and the first model to appear with this power-plant was the Javelin FAW.Mk 7, which also incorporated increased fuel capacity, Firestreak infra-red homing missiles modified flying controls, an extended rear fuselage with raised topline, and later interception equipment, though this entailed the loss of two Aden cannon. Armament comprised two 30mm Aden cannon and four Firestreak AAMs, and 142 were built. The Javelin FAW.Mk 7 took to the air for the first time in November 1956, deliveries getting under way in August 1958.

The FAW.7 model was succeeded by the Javelin FAW.Mk 8 with US radar, drooped wing leading edges and a Sapphire ASSa 7R engines with limited afterburning boosting output to 5579kg above 6100m. Entering service with No. 41 Squadron during early 1960, the Javelin FAW.Mk 8 was the last new-build Javelin variant to appear. Forty-seven were built during 1957-60.

Production of the type termi-nating on 16 August 1960 when the 381st example made its initial flight.

Subsequently 76 Javelin FAW.Mk 7s were updated to the de-finitive Javelin FAW.Mk 8 configuration, though retaining British radar, as Javelin FAW.Mk 9 aircraft standard during 1960-61, with Armstrong Siddeley Sapphire Sa.7R after-burning engines. It had a maximum speed of 702 mph and a service ceiling of 52000 feet. Armament was four Firestreak air-to-air missiles and two 30 mm Aden guns.

The Javelin was finally withdrawn from RAF service in 1967.

 

Gallery


Javelin F(AW). Mk 1
Engnes: 2 x Armstrong Siddeley Saphire ASSa.6 turbojets, 35.6kN
Max take-off weight: 14324 kg / 31579 lb
Wingspan: 15.85 m / 52 ft 0 in
Length: 17.15 m / 56 ft 3 in
Height: 4.88 m / 16 ft 0 in
Wing area: 86.12 sq.m / 926.99 sq ft
Max. speed: 1141 km/h / 709 mph
Ceiling: 16000 m / 52500 ft
Crew: 2

FAW Mk.8
Engines: two 5548-kg (12,230-lb) afterburning thrust Bristol Siddeley Sapphire Mk 203/204 turbojets.
Maximum speed 1101 km/h (684 mph) at sea level
Iinitial climb rate 3734 m (12,250 ft) per minute
Service ceiling 15645 m (51,330 ft)
Rnge with two 1137-litre (250-Imp gal) drop tanks 1497 km. (930 miles).
Mximum take-off weight  (40,000 lb).
Wing span 15.85 m (52 ft 0 in)
Legth 17.16 m (56 ft 3.5n)
Hight 4.88 m (16 ft 0 in)
Wing area 86.12 s (927 sq ft).
Armament: two 30-mm Aden cannon, plus four Firestreak air-to-air missiles

 

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