pretty amazing especailly as the main problem has allways been that in order to get enough power to generate the thrust needed to take of..the batterys weight allways became the catch 22 part that meant that you could never achieve the desired power to weight ratio to get of the ground...(used to make radio controled model aircraft....some folks were experimenting with electric powered RC model aircraft back then ..same problems amplified a hundred time for full size aircraft!)
brilliant stuff...extremely light weight yet very powerfull power cells have huge implications right across the technological board.
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