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Blackburn Type L : ウィキペディア英語版
Blackburn Type L

The Blackburn Type L was a single-engine, two-seat biplane built for the 1914 ''Daily Mail'' Circuit of Britain seaplane race of 1914.
==Development==
All six of Robert Blackburn's previous aircraft had been monoplanes and had suffered no structural problems, but during 1912 in both the UK and in Europe there had been enough monoplane structural failures for the RFC to ban them from service. There was a move to biplanes which Blackburn followed. The Type L, his first biplane and a seaplane was built specifically as a candidate for the Circuit of Britain Race,〔''Flight'' 15 May 1914〕 sponsored by the ''Daily Mail'' with a £5,000 winner's prize.
Assembled at Blackburn's Olympia Works in Leeds (a former skating rink), the Type L〔''Flight'' 25 September 1914〕 was a two-seat tractor seaplane. It had two bay wings without stagger, the upper plane having a span of 14 ft 6 in (4.4 m) greater than the lower, outward-sloping struts connecting the two extremities. The upper plane carried long ailerons extending over 70% of the span. The wings and the square-section fuselage were wooden frames with fabric covering, though the fuselage decking was aluminium. The pilot's seat was just behind the wing trailing edge, with the second seat under the wing. Tail surfaces were conventional, apart from the rudder horn balance positioned under the rear end of the fuselage. The floats were attached to the fuselage with six ash struts and separated by a pair of parallel spreader bars fore and aft. The hydrodynamics of floats was still evolving at the time, and those on the Type L were unusual in having a step close to the nose, followed by an arched, flat-bottomed underside aft to the second step. There was a small float under the tail.〔
Power was provided by a cowled 130 hp (100 kW) Salmson 9 nine-cylinder radial,〔''Flight'' 21 February 1914〕 licence built by Dudbridge Iron Works Ltd at Stroud. Most unusually for a radial, this type was water-cooled and needed two narrow radiators, one either side of the front seat. There were two fuel tanks in the fuselage.〔

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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