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A wind turbine system includes a shaft, a rotor for driving the shaft, and a first fluidic teeter control assembly. The rotor includes a first blade engaged to the shaft by a hub, and has a degree of freedom to pivot relative to the shaft. A first teeter angle is defined between an instantaneous pos

A wind turbine system includes a shaft, a rotor for driving the shaft, and a first fluidic teeter control assembly. The rotor includes a first blade engaged to the shaft by a hub, and has a degree of freedom to pivot relative to the shaft. A first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade. The first fluidic teeter control assembly is engaged between the rotor and the shaft for providing a first dynamic teeter restraining force as a function of the first teeter angle and a fluidic resistance. The first dynamic restraining force is relatively low when the first teeter angle is within a first teeter operation range, and the first dynamic restraining force is higher when the first teeter angle is outside that range.

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1. A wind turbine system comprising: a shaft;a rotor for driving the shaft, the rotor comprising a first blade engaged to the shaft by a hub, wherein the first blade has a degree of freedom to pivot relative to the shaft, and wherein a first teeter angle is defined between an instantaneous position

1. A wind turbine system comprising: a shaft;a rotor for driving the shaft, the rotor comprising a first blade engaged to the shaft by a hub, wherein the first blade has a degree of freedom to pivot relative to the shaft, and wherein a first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade; anda first fluidic teeter control assembly engaged between the rotor and the shaft for selectively providing a first dynamic teeter restraining force as a function of the first teeter angle and a fluidic resistance, wherein the first dynamic restraining force is relatively low when the first teeter angle is within a first teeter operation range, and wherein the first dynamic restraining force is higher when the first teeter angle is outside the first teeter operation range, the first fluidic teeter control assembly comprising: a piston tube;a piston assembly comprising: a piston head movable within the piston tube along a piston axis and having a central opening; andan at least partially hollow piston shaft connected to the piston head and having a piston shaft opening defined through a wall of the piston shaft;a rod extending into the piston tube and having an internal cavity and a rod opening in fluid communication with the internal cavity, wherein the rod is arranged coaxially with the piston axis such that the rod can pass through the central opening in the piston head and into the piston shaft, and wherein the rod is axially fixed relative to the piston tube; anda working fluid, wherein the working fluid is displaced as a function of movement of the piston head, and wherein the rod and the piston assembly are configured to allow alignment of the rod opening, the internal cavity, and the piston shaft opening such that the working fluid can flow therethrough,wherein the rod is rotatable to selectively move the rod opening and the piston shaft opening out of alignment to prevent the working fluid from flowing therebetween. 2. The system of claim 1 and further comprising: a groove defined at or near the interior surface of the piston tube in a generally axial direction with respect to the piston axis for allowing the working fluid to pass between a first volume defined at a first side of the piston and a second volume defined at an opposite second side of the piston. 3. The system of claim 1, wherein the first teeter operation range is plus or minus about three degrees with respect to the time-averaged plane of rotation of the first blade. 4. The system of claim 1 wherein the rotor further comprises a second blade engaged to the shaft by the hub, wherein the second blade has a degree of freedom to pivot relative to the shaft, and wherein a second teeter angle is defined between an instantaneous position of the second blade and a time-averaged plane of rotation of the second blade, the system further comprising: a second fluidic teeter control assembly engaged between the rotor and the shaft for providing a second dynamic teeter restraining force as a function of the second teeter angle, wherein the second dynamic restraining force is relatively low when the teeter angle is within a first teeter operation range, wherein the second dynamic restraining force is higher when the teeter angle is outside the first teeter operation range, and wherein the first and second dynamic restraining forces are independent from each other. 5. The system of claim 1, wherein a size of the rod opening varies along the piston axis. 6. The system of claim 1, wherein the rod opening has a rhombic shape. 7. A teeter-controlled wind turbine system comprising: a support tower extending in a substantially vertical direction;a shaft supported relative to the support tower;a rotor for driving the shaft, the rotor comprising:a central hub;a first blade engaged to the shaft by the hub, wherein the first blade can pivot relative to the shaft such that a first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade; anda second blade engaged to the shaft by a hub, wherein the second blade can pivot relative to the shaft such that a second teeter angle is defined between an instantaneous position of the second blade and a time-averaged plane of rotation of the second blade;a first fluidic teeter control assembly engaged between the rotor and the nacelle for selectively restraining pivoting motion of the first blade as a function of the first teeter angle such that pivoting motion of the first blade is relatively lightly restrained when the first teeter angle is within a first teeter operation range and pivoting motion of the first blade is restrained progressively more as the first teeter angle moves outside the first teeter operation range, the first fluidic teeter control assembly comprising: a piston tube;a piston assembly comprising: a piston head movable within the piston tube along a piston axis and having a central opening; andan at least partially hollow piston shaft connected to the piston head and having a piston shaft opening defined through a wall of the piston shaft;a rod extending into the piston tube and having an internal cavity and a rod opening in fluid communication with the internal cavity, wherein the rod is arranged coaxially with the piston axis such that the rod can pass through the central opening in the piston head and into the piston shaft; anda working fluid, wherein the working fluid is displaced as a function of movement of the piston head, and wherein the rod and the piston assembly are configured to allow alignment of the rod opening, the internal cavity, and the piston shaft opening such that the working fluid can flow therethrough,wherein the rod is rotatable to selectively move the rod opening and the piston shaft opening out of alignment to prevent the working fluid from flowing therebetween; anda second fluidic teeter control assembly engaged between the rotor and the nacelle for selectively providing a second teeter restraining force as a function of the second teeter angle such that pivoting motion of the second blade is relatively lightly restrained when the second teeter angle is within the first teeter operation range and pivoting motion of the second blade is restrained progressively more as the teeter angle moves outside the first teeter operation range, wherein the first and fluidic teeter control assemblies operate substantially independent from one another. 8. The system of claim 7, wherein the second fluidic teeter control assembly comprises: a piston tube that defines an interior surface;a piston movable within the piston tube along a piston axis; anda working fluid, wherein the working fluid is displaced as a function of movement of the piston. 9. The system of claim 7, wherein a size of the rod opening varies along the piston axis. 10. The system of claim 7, wherein the rod opening has a rhombic shape. 11. A fluidic teeter control assembly for use with a wind turbine having a blade pivotable relative to a shaft, the assembly comprising: a piston tube;a piston assembly comprising: a piston head movable within the piston tube along a piston axis and having a central opening; andan at least partially hollow piston shaft connected to the piston head and having a piston shaft opening defined through a wall of the piston shaft;a rod extending into the piston tube and having an internal cavity and a rod opening in fluid communication with the internal cavity, wherein the rod is arranged coaxially with the piston axis such that the rod can pass through the central opening in the piston head and into the piston shaft, and wherein the rod is axially fixed relative to the piston tube; anda working fluid, wherein the working fluid is displaced as a function of movement of the piston head, and wherein the rod and the piston assembly are configured to allow alignment of the rod opening, the internal cavity, and the piston shaft opening such that the working fluid can flow therethrough,wherein the assembly is configured to selectively provide a first dynamic teeter restraining force as a function of a teeter angle and a fluidic resistance, wherein the first dynamic restraining force is relatively low when the teeter angle is within a first teeter operation range, and wherein the first dynamic restraining force is higher when the first teeter angle is outside the first teeter operation range, andwherein the rod is rotatable to selectively move the rod opening and piston shaft opening out of alignment to prevent the working fluid from flowing therebetween. 12. The assembly of claim 11, wherein a size of the rod opening varies along the piston axis. 13. The assembly of claim 11, wherein the rod opening has a rhombic shape.