Dave,
The concept surely calls for an engineering paradox - very high longitudinal blade rigidity with good flexibility in twist.
How exactly will they control the blade pitch at the tip end? There must be something for the swashplate to act against, unless there is to be an aerodynamic "tab" arangement. If so, this would cause complication with a reverse airflow on the retreating side. It also requires some way of actually delivering the control inputs to the tip end of the blade.
How about an annular ring around the outboard end of the rotor disc to house controls for the outer part of the blades? This could be made to an aerodynamic profile so it would contribute to the lift in forward flight. We could then call it the "Advanced Rotor Speed Engineering" (AR$E)
