17. At some point the lift generated by the rotors' forward motion will...
...completely overshaddow rotational lift.
At that point the most stable configuration would be to lock the rotors in an X configuration. With one rotor providing lift with two blades on one side and the other, with two blades on the other. If the blades could be rotated through 180 degrees it would become possible to generate lift on all eight surfaces.
On the other hand two and two makes for a safer descent in the event of losing power.
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