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dissymmetry of lift
- Sinônimos
- dissymmetry of rotor thrust
- Definição1
- The unequal lift across a rotor disc that occurs in forward flight due to the difference in airflow over the advancing and retreating blades.
- Fonte1
- SCHAFER, Joe. Helicopter maintenance. Englewood: Jeppesen Sanderson, Inc., c2007. viii, 343 p.
- Definição2
- The unequal lift across the rotor disc resulting from the difference in the velocity of air over the advancing blade half and retreating blade half of the rotor disc area.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: http://www.faa.gov/library/manuals/aircraft/media/faa-h-8083-21.pdf. Acesso em: 10 fev. 2012.
- Fonte3
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Nota adicional1
- This difference in lift would cause the helicopter to be uncontrollable in any situation other than hovering in a calm wind. There must be a means of compensating, correcting, or eliminating this unequal lift to attain symmetry of lift.
- Nota adicional2
- The advancing blade, the blade whose tip is moving in the same direction the helicopter is flying, has a speed equal to its own speed plus the speed of the helicopter. The retreating blade, the blade whose tip is moving in the opposite direction to that which the helicopter is moving, is traveling at a speed equal to its own speed less the speed of the helicopter. Since aerodynamic lift is determined by the speed of the airfoil through the air, the advancing blade produces more lift than the retreating blade.
- Subárea1
- Rotorcraft
- Português
- assimetria de sustentação
- Imagem
Dissymmetry of rotor thrust.
Fonte: KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.