Right, in a windmill they're mounted at an angle for generating rotation. When you mount them on the fuselage you just set them at an appropriate angle for the aircraft.
Right, in a windmill they're mounted at an angle for generating rotation. When you mount them on the fuselage you just set them at an appropriate angle for the aircraft.
The airspeed will vary along the length of the blade, necessitating a twist to control the angle of attack for efficiency. A blade/wing that would fly would be stalled at the root and/or supersonic at tip, efficient in only a small ring. That's the twist.
The outer half is just a giant wing-tip, increasing efficiency but not producing lift.
It would need half the turbines to turn the other way around to have left/right wings, doubling tooling cost for production.
And it would need a runway of appropriate width, but maybe they could be mounted at significant v-shape.
Return trip not on the ground. The fuselage, engines, ... would still be massive, but with a set of small "normal" wings.
That "just" is carrying an awful lot of weight.