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Heinkel He 70
The Heinkel He 70 is a German mail plane and fast passenger aircraft of the 1930s, that also saw use in auxiliary bomber and reconnaissance roles. It had a relatively brief commercial career before it was replaced by types which could carry more passengers. The He 70 was a leading design for its day, setting eight world speed records by the beginning of 1933.
==Design and development==
The Heinkel He 70 ''Blitz'' (lightning) was designed in the early 1930s to serve as a fast mailplane for ''Deutsche Luft Hansa''. The He 70 was developed in response to a Deutsche Luft Hansa request for a faster aircraft than the Lockheed Vega and Orion (as used by Swissair) for employment on short routes.
It was a low-wing monoplane, with the main characteristics of its revolutionary design its elliptical wing, which the Günther brothers had already used in the Bäumer Sausewind sports plane before they joined Heinkel, and its small, rounded control surfaces. In order to meet the demanding speed requirements, the design minimised drag, with countersunk flush rivets giving a smooth surface finish and a retractable undercarriage, a novel feature for a German aircraft. It was powered by a liquid cooled BMW VI V-12 Vee engine, cooled by ethylene glycol rather than water, allowing a smaller radiator and therefore reducing drag. The pilot and radio operator were seated in tandem, with a cabin housing four passengers on two double seats facing each other.〔Smith and Kay 1972, p.233.〕
The first prototype flew on 1 December 1932,〔Smith and Kay 1972, p.234.〕 and proved to have excellent performance, setting eight world records for speed over distance, and reaching a maximum speed of 377 km/h (222 mph).〔Donald 1999, p.494.〕
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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