Patent ID: 6923622

Claim:
A fluid flow power generating system comprising: a turbine mounted on a structure that is held stationary with reference to said fluid flow; said turbine including a rotor having a main blade section connected to a rotor hub and an extender section, said turbine being positioned on said structure such that said rotor is in alignment with fluid flow direction; said extender section being moveable between a position at least partially retracted in respect of said main blade section and an extended position relative to said main blade section; an adjusting device connected to said extender section; said adjusting device including a first web-engaging wheel anchored at a hub end of said main blade section; a second web-engaging wheel anchored at a distal end of said main blade section; and a web wound around said first and second web-engaging wheels; said extender section being attached to said web at a hub end of said extender section; a motor connected to at least one of said web-engaging wheels, actuable to selectively extend said extender section at low flow velocity and retract said extender section as flow velocity increases such that the loads delivered by or exerted upon said rotor do not exceed set limits; and, a generator connected to said turbine for generating electrical energy.