After a crash-sprinkled early history of trial and error, the developer of a modern reinterpretation of the autogyro is reporting progress in flight testing. Carter Aviation Technologies says it has achieved lift-to-drag ratios greater than 12—flight efficiencies 2.5 times that of a helicopter—in tests of its four-seat Personal Air Vehicle (PAV) prototype. The PAV is the first application of Carter's slowed-rotor/compound (SR/C) concept, which the small Texas-based R&D company is ...


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