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Bluebird K7
''Bluebird K7'' is a turbo jet engined hydroplane with which Britain's Donald Campbell set seven world water speed records (WSR) during the later half of the 1950s and the 1960s. ''K7'' was the first successful jet-powered hydroplane, and was considered revolutionary when launched in January 1955. Campbell and ''K7'' were responsible for adding almost to the WSR, taking it from existing mark of to just over . Donald Campbell was killed in an accident with a much modified ''K7'', on 4 January 1967, whilst making a bid for his eighth WSR, with his aim to raise the record to over on Coniston Water.
==Design==
Donald Campbell began his record-breaking career in 1949 following the death of his father, Sir Malcolm Campbell. Initially, he had been using his father's 1939-built Rolls-Royce 'R' type powered propeller-driven hydroplane ''Bluebird K4'' for his attempts, but he met with little success and suffered a number of frustrating setbacks. In 1951, ''K4'', which had been modified to a prop-rider configuration to increase its performance potential, was destroyed after suffering a structural failure, when its V-drive gearbox sheared its mountings, and punched through the floor of the hull.
Following rival record breaker John Cobb's death in his jet boat ''Crusader'', which broke up at over during a record attempt in September 1952, Campbell began development of his own advanced all-metal jet-powered ''Bluebird K7'' hydroplane to challenge the record, by then held by the American prop rider hydroplane ''Slo-Mo-Shun IV''. Designed by Ken and Lew Norris, the ''K7'' was a steel-framed, aluminium-bodied, three-point hydroplane, built at Samlesbury by Samlesbury Engineering, powered by a Metropolitan-Vickers Beryl axial-flow turbojet engine, producing 3500 pound-force (16 kN) of thrust. Like ''Slo-Mo-Shun'', but unlike Cobb's tricycle ''Crusader'', the three planing points were arranged with two forward and one aft, in a "pickle-fork" layout, prompting ''Bluebirds early comparison to a blue lobster. ''K7'' was of very advanced design and construction, and its load-bearing steel space frame ultra rigid. It had a design speed of and remained the only successful jet-boat in the world until the late 1960s.
The designation "K7" was derived from its Lloyd's unlimited rating registration. It was carried on a prominent white roundel on its sponsons, underneath an infinity symbol. ''Bluebird K7'' was the seventh boat registered at Lloyds in the 'Unlimited' series.
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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