I am trying to sus out what is required in the heli so I can make a better choice for my next heli.

I understand: Pilot 75%, heli 25% and that there is a range of power/wt that is OK for 3D.

What about disc loading? Main Blade area/weight (AUW).

Do the blades and mounting to the head need to be quite stiff (non-flexible) to cope with the loads generated on the disc during sudden changes in direction OR does the head speed mean this is not required so much.

I read somewhere about "coning" of the blades during a loop.
Is there a rule of thumb for Tail rotor size in relation to MR size or blade stiffness?

Thanks Jeff