On 27 July 1949 raised for the first time from a commercial jet-powered machine for a test flight. This aircraft was the British de Havilland DH 106 Comet, in this picture:
The aircraft was immediately in great demand and was the type name "Comet" is very popular, but was soon hit by strange accidents in which these aircraft were simply from the sky.
research reveals that both the square window as well as to hard metal alloys resulted in the external structure of the aircraft, the internal pressure could not withstand. The aircraft burst into the stratosphere.
Using the Comet 4 "have been fixed these problems. Softer and therefore more dynamic fixed alloys and the usual round window today to the problems. The Comet 4 was produced from 1958 to 1964, but could not beat the competition by Boeing 707, Douglas DC-8 and Caravelle Sud not keep the upper hand.
Source:
http://www.johnjohn.co.uk/compare-tigermothflights/photos/DH106_Comet_1.jpg
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