Boeing X-50 Dragonfly

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Invention

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Science and technology

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What Wikipedia says

The Boeing X-50A Dragonfly, formerly known as the Canard Rotor/Wing Demonstrator, was a VTOL rotor wing experimental unmanned aerial vehicle that was developed by Boeing and DARPA to demonstrate the principle that a helicopter's rotor could be stopped in flight and act as a fixed wing, enabling it to transition between fixed-wing and rotary-wing flight.

Excerpt from the Wikipedia article “Boeing X-50 Dragonfly”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Boeing via Erik Simonsen, Public domain, via Wikimedia Commons.