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Battery-Powered Helicopter Completes History-Making First Flight – Video
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 redundancy in the event of a motor failure.
The range of the prototype for now just 20 minutes, or approximately 30 nautical miles, but the goal is to have an EV helicopter which can carry two people and three manufactured organs with a total payload weight of 600 pounds for not less than 150 minutes, including a 30 minute reserve.