Originally Posted by
SplineDrive
Loads, radius, airfoil thickness, blade stiffness, and tip deflection all change so that the blades are strained the same. I don't think that new materials are required as gross weights increase, though I can certainly imagine that specific pitch bearing joint technologies work well at certain size ranges and may practically constrain the hub design at some point.
What about a bearingless rotor?
@etudiant
We don't really have a firm grasp even on conventional rotor systems engineering
The 225 in Norway that you cited as an example is a gearbox/transmission issue, not a
rotor system issue. (though as CH-53K seems to be finding out, at some point when you get bigger you get some new problems inside the gear box ...)