30 + Minute Electric Helicopter Flight - Electric Rotorcraft

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, weighing 100 lb, plus 11 Brammo Lithium polymer batteries weighing 1100 lb and a digital cockpit display. It later flew for 20 minutes in 2016.”