The conception of the Pegasus engine in 1957 upset all the conventions of aircraft design. It was previously usual for aircraft designers to seek a suitable engine, but this was an engine that sought an aircraft. The aircraft that resulted was the famous Harrier that is still in front-line service

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The 'Jump-jet' was the world's first vertical/short take-off and landing (VSTOL) operational jet aircraft. Developed using the revolutionary Pegasus engine, the Harrier has served the RAF and US Marine Corps well for over 30 years. Here, vividly told, is the fascinating story from tentative hovering by the Hawker P1127 in