WhoKnows thank you, yes “hingeless “ is a better descriptor that “rigid”. Flapping would be absorbed by the blades/plates. Feathering by twisting the plates. Crab this would conceptually be a simpler system having fewer parts than a teetering system. The advantage would be no mast bumping. The control system should be identical to standard controls.
As as I work through this the force required to induce feathering (and therefore control) is he only issue I can see.