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Back to: "R"rotor blade (airfoil)
- Definição1
- A long thin aerofoil on a helicopter rotor.
- Fonte1
- CROCKER, David. Dictionary of aviation. 2nd ed. London: A&C, 2005.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Fonte3
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Montreal, 2014. (Doc. 9756)
- Contexto
- Each rotor blade is also attached to the hub by a vertical hinge, called a drag or lag hinge, that permits each blade, independently of the others, to move back and forth in the plane of the rotor disc. Dampers are normally incorporated in the design of this type of rotor system to prevent excessive motion about the drag hinge. The purpose of the drag hinge and dampers is to absorb the acceleration and deceleration of the rotor blades.
- Determine the direction of rotation of the tail rotor blade. The direction of rotation of the tail rotor varies between models. Generally, the advancing tail rotor blade moves in the direction opposite the flow of air from the main rotor blade to maximize the resultant flow of air across the tail rotor blade. However, in an effort to decrease noise and vibration, some helicopter tail rotor blades rotate so that the advancing tail rotor blade moves in the same direction as the flow of air from the main rotor blade. An issue with the tail rotor advancing with the flow of air from the main rotor blade is an inability to maintain sideward flight at moderate speeds on the side of the retreating main rotor blade. The direction of rotation of a fenestron, or ducted-fan, is also important and displays the same aerodynamic efficiency characteristics as seen in conventional tail rotors. Ducted-fan tail rotors are in use by Eurocopter, Sikorsky and other manufacturers and also provide some safety benefits during loading with the rotors turning.
- Subárea1
- Engine
- Related Term
- rotor blade tip
- Português
- pá de rotor (aerofólio)