I can think of some possible reasons. Can't kill any ground crew if the prop ends are 8 feet up. Fuel engines get more efficient the bigger you make them, so bi

I can think of some possible reasons. Can't kill any ground crew if the prop ends are 8 feet up. Fuel engines get more efficient the bigger you make them, so big propeller aircraft being more efficient isn't necessarily because of the prop size, but rather a side effect of engine size. Electric motors don't gain much efficiency with increased size AFAIK, so they can get away with small motors. Lots of props close to the wing would guide the air well - you don't get that giant vortex of wasted energy. Redundancy - they could lose multiple propellers. That's especially needed since some of these electric aircraft are VTOL and can't glide or autorotate in an emergency. I'm thinking of https://wisk.aero https://wisk.aero . Market constraints - this is a new application so they're relying on other industries for the motors they can pick from.