To: cyclic flare
Since everyone else is hazarding a guess or trying to be funny I’ll hazard a guess. If the blades had a high coning angle and you introduced any cyclic input the blades would be exposed to high lead lag loads. This could overstress the blades along the spanwise axis resulting in metal deformation. In this case, the blades would have to flap in relation to the underslung rotorhead.
Not a single word about the 18-degree offset.
And no, I didn’t do it.
