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The tiltrotor or ‘convertible’ aircraft experienced such a convoluted development path with the first production aircraft entering front-line service only fairly recently, after a long design and prototyping process that began in the 1950s. This era of aviation history saw an explosion of conceptual thinking on experimental aviation theories such as the ‘convertible’ aircraft, and the first successful technology demonstrator was built during the 1950s by Bell, as the XV-3



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