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Blackburn Cubaroo
The Blackburn T.4 Cubaroo was a prototype British biplane torpedo bomber of the 1920s. Built by Blackburn Aircraft and intended to carry a large 21 in (533 mm) torpedo, the Cubaroo was one of the largest single-engined aircraft of the world at the time of its first flight.
==Design and development==
In 1921, the British Air Ministry issued Specification 8/21 to Blackburn for a ''Coastal Defence Torpedo Aeroplane'', the resulting design was designated the T.4 Cubaroo. Due to the change of policy in the Air Ministry to favour a twin-engined design a new sepcification was issued in 1922, the British Air Ministry drew up Specification 16/22, for a long-range torpedo bomber capable of carrying a 21 in (533 mm) torpedo (which was at the time thought capable of sinking the largest warship) over a range of 800 mi (1,300 km). Major F. A Bumpus, chief designer of Blackburn Aircraft submitted the design for the Blackburn T.4 Cubaroo, which was a large biplane powered by a single example of the new 1,000 hp (750 kW) Napier Cub engine. Avro also submitted a design against this specification, the Avro 557 Ava, which was a similarly large biplane, powered by two 600 hp (450 kW) Rolls-Royce Condor engines.
In order to carry the heavy (over 2,000 lb/907 kg) torpedo over a long range, the Cubaroo was massive. With a wingspan of 88 ft (27 m), it may have been the largest single-engine military aircraft in the world at the time,〔 and was fitted with the most powerful aircraft engine available, the Napier Cub, which was an unusual X-type engine which weighed over a ton excluding radiators. The Cubaroo, with a mainly metal structure, had a deep fuselage to accommodate the Cub engine, and was fitted with folding, two-bay wings. In order to allow the torpedo to be carried, the Cubaroo was fitted with a main undercarriage comprising two sets of two wheels, with the torpedo being carried on a crutch between the two sets of wheels.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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