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Manned  “In September 2016, Martine Rothblatt and Tier1 Engineering successfully tested an electric-powered helicopter. The five minute flight reached an altitude of 400 feet with a peak speed of 80 knots. The Robinson R44 helicopter was modified with two three-phase permanent magnet synchronous YASA Motors,...
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By Mark Guccione, As Told To Brookr Morton SCUBA Diving | July 2016 The helicopter door opens right above the ocean, and wind floods in. That’s when the diver’s perception narrows: He stops hearing the thumping of the rotor blades....
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