Originally Posted by
discap
From my understanding even the rigid heads all for feathering without a dedicated hinge.
By definition, a rigid rotor includes feathering but not flap or lead-lag movement. Could a 2 blade rigid system be built? Sure, but what would you do with it. The ride would be terrible. And with any type of useful load, I would imagine the bending forces at the hub/mast/xsmn would require those components to be pretty substantial in strength/weight/size.