ANACpedia

transverse flow effect

Definição1: A condition in helicopter forward flight when the air flowing through the rear of the disc is more perpendicular than that flowing through the font. This flow causes a decreased angle of attack and the tencency of the rear of the disc to descend. Precession causes the effect to be felt 90º in the direction of rotation and the helicopter has a tendency to roll to the right.
Fonte1: CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Definição2: A condition of increased drag and decreased lift in the aft portion of the rotor disc caused by the air having a greater induced velocity and angle in the aft portion of the disc.
Fonte2: ARAÚJO, João Richard Barcelos. Inglês técnico: técnicos em manutenção de aeronaves. [S.l]: [s.n.], [200-]. 100 p.
Fonte3: 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.
Contexto: You can recognize transverse flow effect because of increased vibrations of the helicopter at airspeeds just below effective translational lift on takeoff and after passing through effective translational lift during landing. To counteract transverse flow effect, a cyclic input needs to be made.
Subárea1: Rotorcraft
Português: efeito do fluxo transverso