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In 1942, they began to sell elevator products by the Rotary Lift Company, [1] which, in 1955, merged with other companies and changed their name to the Dover Elevator Division. [2] In 1999, they became a reseller of ThyssenDover Elevators, the company that was formed after the merger of Dover Elevator and Thyssen Elevator.
The main types include the helicopter with powered rotors providing both lift and thrust, and the autogyro with unpowered rotors providing lift only. There are also various hybrid types, especially the gyrodyne which has both a powered rotor and independent forward propulsion, and the stopped rotor in which the rotor stops spinning to act as a ...
A ball screw involves significantly more parts and surface interactions than many similar systems. While a basic lead screw is composed of only a solid shaft and a solid nut with simple mating geometries, a ball screw requires precisely-formed curved contours and multi-part assemblies to facilitate the action of the bearing balls.
A rotary-wing aircraft, rotorwing aircraft or rotorcraft is a heavier-than-air aircraft with rotary wings that spin around a vertical mast to generate lift. The assembly of several rotor blades mounted on a single mast is referred to as a rotor .
Weather message switching center replacement WOCL window of circadian low WOFW weight-off-wheels Indicates aircraft is off ground since lift off WONW weight-on-wheels Indicates aircraft is on ground since touch down WPT Waypoint: Or: WYPT WRT WXR receiver transmitter WS wind shear: WTC Wake Turbulence Category: Wx weather [1] WXR Weather radar ...
An advantage of quad rotors on small aircraft such as drones is the opportunity for mechanical simplicity. A quadcopter using electric motors and fixed-pitch rotors has only four moving parts. Pitch, yaw and roll can be controlled by changing the relative lift of different rotor pairs without changing total lift. [32] The two families of ...
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