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LZ 4
The Zeppelin LZ 4 was a German experimental airship constructed under the direction of Ferdinand von Zeppelin. First flown on 20 June 1908, it made a series of successful flights including a 12-hour flight over Switzerland. It was destroyed when it caught fire after landing to carry out engine repairs during a projected 24-hour endurance trial.〔Robinson 1973 p.34〕 This disaster proved fortunate for Zeppelin: donations by the German public raised 6.5 million marks, so guaranteeing the future of his development of airships.
==Background==
The successful flights of LZ 3 in 1906 had produced a change in the official attitude to Count Zeppelin's work, and a grant of 500,000 marks had been voted by the Reichstag. However, a condition of purchase by the government was the completion of a 24-hour trial flight. This was beyond the capabilities of LZ 3, so work was started on a larger airship with a greater fuel capacity.〔Robinson 1973, p. 33.〕
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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