Battery-Powered Helicopter Completes History-Making First Flight – Video

Tier 1 Engineering announced the accomplishment of the first battery-powered full-size helicopter flight at Los Alamitos Army Airfield last month. The modified Robinson R44 is equipped with Brammo lithium polymer batteries (700 volt, 100 amp-hour) and two Rinehart Motion Systems electric motors (three-phase permanent magnet synchronous) stacked together to provide… …read more