hi,
Im not totally sure of the answer but found this:
"While some tail rotors may be designed to allow coning, all tail rotors simply pre-cone the blades and don't worry about coning in the design. Helicopters with more than 2 blades (or more than 2 double stacked blades like the Hughes/MDHC-500) have a flapping hinge which acts as a coning hinge."
It is almost like they cone the blades to prevent further movement in flight?
I noticed it at the London Air Show - The Navy Lynk tail was coned dramitically?
Maybe somebody else will have a better answer?
RHM