rotor drag
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rotor system types — There are three types of rotors: rigid, semirigid, and fully articulated. In a rigid rotor, the blades are free to change pitch but otherwise are made as rigid as possible. The blades of rigid rotor have no hinges that allow them to flap or drag … Aviation dictionary
drag — i. That component of aerodynamic forces acting on the wing or the airfoil section, which is parallel and opposite to the relative airflow. The sources of drag are the pressure distribution patterns over the airfoil, called induced drag; the skin… … Aviation dictionary
Drag equation — In fluid dynamics, the drag equation is a practical formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The equation is attributed to Lord Rayleigh, who originally used L2 in place … Wikipedia
drag brace — i. An adjustable brace used to adjust the blade alignment of a semi rigid rotor. The braces resist the movement of the blade about its lead lad hinge and provide a means of sweeping the blade for chordwise balance. It is normally mounted on the… … Aviation dictionary
drag damper — Devices meant to dampen the dragging action of helicopters’ rotor blades. They are fitted between the rotor blades and part of the hub on all rotor systems in which dragging takes place. For damping, a hydraulic or friction system is usually… … Aviation dictionary
rotor profile power — A component of the power needed to drive the rotor of a helicopter. It is the power required to maintain a given rotor RPM when the collective is at its minimum setting and to overcome the drag produced by ancillary equipment … Aviation dictionary
rotor force — The resultant force imparted by a lifting rotor. It can be broken into lift, drag, and thrust all of which are perpendicular to the disc … Aviation dictionary
drag hinge — The hinges of a helicopter that permit movement as the blade drag varies during rotation. These are located approximately at the root of the helicopter main rotor blade … Aviation dictionary
Helicopter rotor — This article is about helicopter main rotor systems. For antitorque control, see tail rotor. Helicopter rotor The rotor head of a Sikorsky S 92 A helicopter main rotor or rotor system is a type of fan that is used to generate both the aerodynamic … Wikipedia
Flettner-Rotor — Spielzeugschiff mit Flettner Rotoren Der Flettner Rotor ist ein alternativer aerodynamischer Antrieb in Form eines der Windströmung ausgesetzten, rotierenden Zylinders, der durch den Magnus Effekt eine Kraft quer zur Anströmung entwickelt. Er ist … Deutsch Wikipedia
