Described is a rotor disk (40) for a compressor (29, 32) of a gas turbine, in particular an aircraft gas turbine (10), the rotor disk having a main body (42), at least one rotor arm (44) projecting from the main body (42) in the axial direction (AR), the rotor arm (44) having, in a sectional view taken in a sectional plane defined by the axial direction (AR) and the radial direction (RR) a beginning portion (44a) merging into the main body (42); an end (44e) portion remote from the main body (42) and forming a kind of free end in the axial direction (AR), the beginning portion (44a) and the end portion (44e) being interconnected by an intermediate portion (44z), characterized in that the intermediate portion (44z) is curved with at least one radius of curvature (Ri, Ra).

The present disclosure provides a fan including a hub and multiple fan blades coupled to the hub and located circumferentially along the hub. Each fan blade extends between a root and a tip edge thereof and includes a first portion inclined at a first predefined angle with respect to the hub. The first portion induces an axial flow of air. The fan blade also includes a second portion extending from the first portion and between a leading edge and a trailing edge of the fan blade. The second portion is embodied as an airfoil defining an angle of attack to induce a radial inward flow of air. A radius of curvature of a trailing edge segment of the second portion is less than a radius of curvature of a leading edge segment of the second portion.

A fan includes a motor, a rotatable hub coupled to the motor, and at least one fan blade. The at least one fan blade includes a first end coupled to the rotatable hub, a second end, a leading edge, a trailing edge, a passage extending from the first end to the second end, and a winglet attached to the second end. At least one flexible strap extends through the passage of the at least one fan blade. The flexible strap is coupled at a first end to the rotatable hub and coupled at a second end to the winglet, such as to an inner portion thereof within the passage.

A gas turbine engine according to an example of the present disclosure includes, among other things, a propulsor including a rotor hub and an array of blades circumferentially spaced about the rotor hub, a geared architecture, a compressor section and a turbine section. Each blade includes pressure and suction sides and extends in a radial direction from a 0% span position at an inner flow path location to a 100% span position at an airfoil tip, adjacent blades in the array of blades including a first blade and a second blade, a facing pressure side of the first blade and a facing suction side of the second blade defining a channel having a width that varies in a chordwise direction between the facing pressure and suction sides at a given span position of the first and second blades. The width at each pressure side location of the first blade along the channel is defined as a minimum distance from the respective pressure side location to a location along the suction side of the second blade, and the width of the channel converges in the chordwise direction to establish a throat.

An axial flow fan includes a hub and a blade provided around the hub and having a leading edge and a trailing edge. The blade has a thickness portion. The thickness portion includes a first thickness portion located adjacent to the leading edge and a second thickness portion located adjacent to the trailing edge. A virtual circle centered on the rotation axis and passing through both the first thickness portion and the second thickness portion of the blade is a reference circle, an intersection at which the reference circle intersects an edge portion of the first thickness portion is a first intersection, an intersection at which the reference circle intersects an edge portion of the second thickness portion is a second intersection, an intersection of the reference circle and the leading edge is a first edge portion, an intersection of the reference circle and the trailing edge is a second edge portion, a straight line passing through the rotation axis and the first intersection is a thickness portion first straight line, a straight line passing through the rotation axis and the second intersection is a thickness portion second straight line, a straight line passing through the rotation axis and the first edge portion is an edge portion first straight line, a straight line passing through the rotation axis and the second edge portion is an edge portion second straight line, an angle between the thickness portion first straight line and the edge portion first straight line is a phase angle θ1, and an angle between the thickness portion second straight line and the edge portion second straight line is a phase angle θ2. The phase angle θ1 is larger than the phase angle θ2.

The device includes a substantially cylindrical, oblong, rigid, extension pole having a distal end upon which is formed an articulatable jaw structure head which can be actuated between open and closed positions by the pull of either a medial handle or knob located at the proximal end. A collector sock made from a pliable sheet material can be mounted upon the jaw structure so that the sock enwraps the entire item to be dusted such as a ceiling fan blade. The inner surface of the sock surrounding its open end maw can include asperities and electrostatic, dust adhering fibers to help scrape off and capture fine particles of dust and other debris from the item being dusted. The head can include a pair of parallely separatable cantelevered beams engaging the sock.

A ceiling fan assembly comprising a motor, a mount for coupling to a structure and for suspending the motor, and a ceiling fan blade comprising only a blade body for coupling to the motor, wherein the ceiling fan blade is formed from a molded pulp comprising at least one of paper fibers, plant fibers, or wood fibers.

A ceiling fan assembly comprising a motor, a mount for coupling to a structure and for suspending the motor, and a ceiling fan blade comprising only a blade body for coupling to the motor, wherein the ceiling fan blade is formed from a molded pulp comprising at least one of paper fibers, plant fibers, or wood fibers.

A counter-rotating axial air moving device is disclosed. A front rotor includes a front hub, front first blades, a front annular sheet, front second blades, a front first radial zone and a front second radial zone. A rear rotor is disposed on a rear side of the front rotor and includes a rear hub, rear first blades, a rear annular sheet, rear second blades, a rear first radial zone and a rear second radial zone. A better performance is achieved by optimal matching designs of each radial partition, and the deterioration of vibration and noise is avoided.

A drench system includes a rotating mount to rotate a workpiece, a showerhead to dispense a fluid onto the workpiece; and a tray to collect the fluid and recirculate the fluid to the shower. A method of repairing or remanufacturing a coating includes abrading a surface to at least partially remove a portion of a coating to leave an abraded surface; applying a sol-gel over the abraded surface; applying a corrosion resistant primer onto the sol-gel; and applying an erosion coating onto the corrosion resistant primer.