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The BMW 109-718 is a liquid fuelled rocket motor developed by BMW at their Bruckmühl facility,〔Christopher, John. ''The Race for Hitler's X-Planes'' (The Mill, Gloucestershire: History Press, 2013), p.123.〕 in Germany during the Second World War. The 109-718 (109 for the ''Reichsluftfahrtministerium'', or ''RLM'', designation for rocket and jet projects)〔Christopher, p.124.〕 was designed as an assist rocket for aircraft, for rapid takeoffs or to enable them to achieve high-speed sprints,〔 akin to what Americans called "mixed power" postwar. It was fitted with a variant of the BMW 003 jet engine, the 003R, providing thrust each;〔 it was expected the units would be fitted in pairs. Unlike JATO, the 781 was not intended to be expendable.〔 The rocket motor had internal and external main chambers which were cooled by the nitric acid fuel, fed through a coiled spiral tube.〔 The cenfrifugal fuel pumps〔 (operating at 17,000rpm)〔Christopher, p.125.〕 delivered a mix of nitric acid oxidiser and hydrocarbon fuel〔 at ,〔Christopher, p.125, calls it 50 atmospheres.〕 a rate of ''per'' thrust ''per'' second.〔 The 718s fuel pumps were driven by a power take-off from the jet engine which ran at 3,000 rpm.〔 The complete unit weighed .〔 Before war's end, a Messerschmitt Me 262C-2b ''Heimatschützer'' (Home Defender) was tested with a pair of 718s, climbing to in just three minutes.〔 The 109-718 was also tested aboard an He 162E,〔 though records do not indicate the results of this test. The Germans hoped the rocket might eventually rely on the same fuel as jet aircraft.〔 Only twenty 109-718 engines were completed by war's end, each taking some 100 hours to complete.〔 == Specifications == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BMW 109-718」の詳細全文を読む スポンサード リンク
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