Even helicopters burn fuel like crazy when hovering out of ground effect, and the only reason we use them are their huge main rotors that get some of that effic

Even helicopters burn fuel like crazy when hovering out of ground effect, and the only reason we use them are their huge main rotors that get some of that efficiency back when actually moving at speed, and also because they're the only thing available. Anything fighting gravity with pure thrust is basically DOA at this point, and double that for inherently inefficient propulsion methods like jets. Ducted fans, maybe, but most likely not. And that's still allowing for fossil fuels and huge fuel consumption. Bring batteries into the equation and you can forget about personal VTOL for anything longer than five minute hops.