Exactly, sure the motor is super light. Great. What happens when you put enough batteries in the airplane for a ~2 hour flight? Just assume that at cruise it's only using 1/2 of the rated power. OK, now where do we find a 260kWh battery pack light and small enough to fit in the plane? That's a full 3x of Tesla Model S battery packs.

Unless we have high density super batteries electric vehicles will become a fad.