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Vincent Black Prince
The Vincent Black Prince was a British motorcycle made between 1954 and 1955 by Vincent Motorcycles. A year before the factory closed in 1955, Vincent produced the enclosed range of Vincent Black Knight and Black Prince. Philip Vincent described it as a "two-wheeled Bentley", and the enclosed Vincents attracted a lot of attention at the November 1954 Earls Court show.〔 Quality problems with early production of the glass-fibre mouldings necessitated a replacement supplier causing delays. The last Black Prince left the Vincent production line on Friday, 16 December 1955.〔(【引用サイトリンク】title=Black Prince )〕
==Development==
Falling sales of the Series C Vincent motorcycles during 1952 and 1953 was partly attributed to dated styling, so Philip Vincent sought to update the range and development began on what were to become the Series D machines. The main changes were redesigned frame components, resited oil tank, larger fuel tank, smaller diameter wheels, one-less rear brake drum, new design carburettors and updated electrics.〔
Black Knight and Black Prince versions were innovative in using full enclosure and weather protection, with glass fibre panels that included leg shields and a handlebar fairing. This was not about streamlining for speed, as the fairings reduced top speed by , although the Vincent was already powerful enough for riders of the day - it was instead about the idea that the rider could travel to work in a suit rather than full motorcycle kit.〔 Care was taken to ensure that the engine was still easily accessible for general maintenance, and the rear enclosure was hinged to provide access to the rear wheel and drive chain.〔
Vincent also tried to make it easier for the rider to get the motorcycle on to its new centre-stand by adding a huge lever on the left of the machine that could be operated from the saddle. The frame was also modified, re-siting the oil tank previously contained within the ''Upper Frame Member'' under the fuel tank, to underside of the new-design seat. A replacement single tubular strut bolted to the steering head and a single spring-damper unit replaced the twin rear shocks.〔〔''Motorcycle Sport'', July 1979, pp.347-349, 360 ''P.C. Vincent - A tribute'' by R.R.H. (Robert 'Bob' Holliday, ex-editor of ''Motor Cycling'') Accessed and added 25 June 2014〕
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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