Abstract: Provided is a driving apparatus of a variable pitch propeller having blades, each of which has a pitch angle changed in a rotational direction of a propeller shaft, and a pitch adjuster for adjusting the pitch angle. The pitch adjuster includes blade actuating shafts that are connected to eccentric stubs coupled to lower ends of the blades and are disposed inside the propeller shaft so as to allow linear reciprocation and to push or pull the eccentric stubs, and a power converter that converts a rotating motion of the propeller shaft into a linearly reciprocating motion of the blade actuating shafts.

Abstract: A horizontal axis wind turbine with a ball-and-socket hub is disclosed. The hub enables horizontal axis turbines with two or more blades to teeter in response to wind shear gradients. The new hub design for a turbine equipped with three blades has been modeled using modified FAST code and has shown significant advantages over present three-bladed turbines with fixed hubs in reducing loads on the blades, tower, main shaft and bearings. The new hub design for a turbine equipped with three blades has also shown significant advantages over present two-bladed teetering turbines in reducing loads on the blades and tower. A likely additional advantage of a ball-and-socket hub equipped with three blades over a teetering hub with two blades is that wider teetering ranges are possible due to the significantly reduced likelihood for resonant teetering.

Abstract: A blade for a stator in a torque converter, including: a first blade segment connected to an inner circumferential section of the stator; at least one second blade segment, separately formed from the first blade segment, and connected to the inner circumferential section; and a third blade segment, separately formed from the first and second blade segments, and connected to the inner circumferential section. In some aspects, the first, second, and third blade segments include respective outer radial portions and the outer radial portions are fixedly connected. In some aspects, the first and second blade segments are in contact and the second and third blade segments are in contact. In some aspects, the first, second, and third blade segments include respective edges and the first and second blade segments are in contact along the respective edges and the second and third blade segments are in contact along the respective edges.

Abstract: A method for repairing a hub pitch gear assembly. The method includes providing a ring assembly for adjusting a pitch angle of a wind turbine blade having a plurality of gear teeth. A segment of the ring assembly is removed, the segment including at least a portion of at least one gear tooth, to form a repair cavity. A repair segment configured to mate the repair cavity is provided and the repair segment is directed into the repair cavity and fastened in position. A repaired pitch gear assembly and wind turbine are also disclosed.

Abstract: A propeller is controlled to change pitch at at least two different rates. In one embodiment, an electric motor is provided with a high or low voltage for driving a pitch change mechanism at a high or low change rate. Preferably the rate is selected automatically. Preferably, the high rate is not used unless the current pitch is below a threshold.

Abstract: A propeller unit, each blade (1) being fixed to a blade foot (2) rendered integral with a hub (3) rotating around an axis but mobile with respect to the hub on translation in the direction of the axis and rotating around a second axis orthogonal to the first axis, this foot (2) being moreover rendered integral with an arch (5) in translation but free with respect to the arch on rotation; a pitch modifier is linked to the arch to translate the arch along the spin axis of the hub (3); the hub (3) and each blade foot (2) have members (8, 23) for activating the feet in rotation provoking from translation of the arch (5) the rotation of the blade feet around an axis mobile on translation in the same direction and orthogonal to the blade feet.

Abstract: A fan impeller for axial flow having automatically variable-pitch blades ached to a rotatable hub for attaining maximum lift and inhibiting stall in a varying back pressure regime. The blades are attached for rotation about their axes to the hub, and are connected through a crank and link to a drive shaft. The hub is attached to the drive shaft to permit relative axial movement, but to preclude relative rotational movement. Varying back pressure moves the blades and the hub in variable blade rotation planes, causing changes in blade pitch. Springs and dash-pots, connecting the hub and shaft, act axially to give non-linear restoring forces and damping to the blade pitch changes.

Abstract: An aircraft having a rotor wing which in one position is locked against the irframe for forward flight, and in another position is extended clear of the airframe. In the extended position the wing is rotated and the tip portions are controllable in the manner of a helicopter rotor. A single power source provides propulsive and wing rotation power. In the preferred form the power source is a turbojet engine and the wing is rotated by a tip jet powered drive beam, separated from the wing to avoid aerodynamic interference. For forward flight the drive beam is enclosed in the airframe as the wing is retracted to fixed position.