Designers have resorted to complex rotor systems, tilting wings, thrust vectoring or direct lift to master the tricky challenge of combining vertical-takeoff-and-landing (VTOL) capability with high cruise speed. Now developers in Michigan have unveiled preliminary test results of a simpler arc-wing concept that they hope could bring efficient hover and fast cruise capabilities to general aviation with lower cost and complexity. Bay City, Michigan-based Bertelsen Design has taken the wraps ...

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