Design and Development
The Gladiator was developed from the Gloster Gauntlet as a private venture by H.P. Folland's team at Gloster to meet Specification F.7/30. F.7/30 demanded a top speed of at least 250 mph (400 km/h) and an armament of four machine-guns, while encouraging the use of the new Rolls-Royce Goshawk evaporatively cooled engine, which was used by most of the competitors for the specification. This engine proved, however to be unreliable, and Folland realised that the Gauntlet could be quickly revised to meet the specification. To reduce drag, the new fighter, the SS.37, had single-bay wings instead of the two-bay wings of the Gauntlet, and was fitted with a cantilever main undercarriage incorporating internally sprung wheels.
The SS.37 first flew on 12 September 1934, powered by a 530 hp (395 kW) Bristol Mercury VIS engine, but was soon fitted with a more powerful engine, reaching 242 mph (390 km/h) while carrying the required four machine guns (two synchronised Vickers guns in the fuselage and two Lewis guns under the lower wing). On 3 April 1935, the Royal Air Force commenced operational evaluations, while Gloster planned a further improved version with a 830 hp (619 kW) Mercury IX and a fully enclosed cockpit.
Three months later, a first order was placed for 23 aircraft to Specification F.14/35, with the aircraft named "Gloster Gladiator", followed by an order of 180 in September. The first version, the Mk I, was delivered from July 1936, becoming operational in January 1937. The Mk II soon followed, the main differences being a slightly more powerful Mercury engine driving a Fairey fixed-pitch, three-bladed metal propeller instead of the two-bladed wooden one. A modified Mk II, the Sea Gladiator, was developed for the Royal Navy's Fleet Air Arm (FAA), with an arrestor hook to be engaged when landing on an aircraft carrier, catapult points, a strengthened frame and an under-belly fairing for a dinghy lifeboat. Of the 98 aircraft built as, or converted to, Sea Gladiators, 54 were still in service by the outbreak of the Second World War in September 1939.
The Gladiator was to be the last British biplane fighter and the first fighter with an enclosed cockpit. The Gladiator had a top speed of around 257 mph (414 km/h) yet, even as it was introduced, the design was being eclipsed by new-generation monoplane fighters, such as the RAF's new Hurricane and Spitfire, and the Luftwaffe's Messerschmitt Bf 109.
A total of 747 aircraft were built (483 RAF, 98 RN; 216 exported to 13 countries, some of them from the total allotted to the RAF). Gladiators were sold to Belgium, China, Egypt, Finland, Free France, Greece, Iraq, Ireland, Latvia, Lithuania, Norway, Portugal, South Africa and Sweden.
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