Compared to most of the electric schemes this one seems reasonable. What I could not figure out is how much if any batteries the plane carries. They say you do not need ground recharging so that implies all the power is coming from the on board ICE generator? Is fuel part of the payload ?
I agree this is a long way from anything that is useful and economic but it makes a lot more sense than lilium aviation which has managed to raise 1.3 billion! As for investors, aviation seems to make them totally ga-ga. As Warren Buffet said, "Indeed, if a farsighted capitalist had been present at Kitty Hawk, he would have done his successors a huge favor by shooting Orville down."