also, how is flexing the rear blades going to cause furling if the front blades are fixed? the fronts will overspeed, and the centrifugal psuedoforce will keep the rear blades out. the best you can do there is that the rear blades will act as a drag on the fronts, but i doubt that will stop overspeeding. again, this thing has no furling.

long thin shaft like that between your flapping airbrake and your over-speeding blades? fatigue and broken shaft within the first couple gusty storms.