To: Gaseous
I can’t honestly say if it would solve the problem or not. What you describer is a Bell rotorhead with flapping hinges. You are correct in your assumption that it would solve the problem of a 90-degree pitch horn on a Robinson head but I do not know if the rotor system would perform as an aerodynamic entity. However the CH-47 has a similar situation as it has a flapping hinge as does the conventional Sikorsky designs. The blade flapping hinges and the pitch horns are almost coincident with each other when there is no pitch in the blade. When pitch is input into the blade the pitch horn rises above the hinge line and when the blade flaps due to gusting you get delta three with the attendant pitch flap coupling. There is however a problem that results from flapping and that is you get lead and lag. On the Robinson and Bell heads they are underslung to minimize if not eliminate lead and lag. On the Robbie what little lead and lag you get it is absorbed in the inplane bending of the blade and is reacted by the cone hinges, the main mast at the teeter point and eventually the fuselage.
It would be difficult to design a rotorhead that is both underslung and has flapping hinges. That is not to say it can’t be done but not on an R-22 or R-44.
Regarding your messy comment: If you want to see messy look at the rotorhead on an S-51. The pitch input crosses both the flapping hinge and the lead lag hinge.
