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adverse yaw
Definição1
A flight condition in which the nose of an aircraft starts to move in the direction opposite to that in which the turn is initiated. The downward deflected aileron, in this case, produces greater induced drag, which results in adverse yaw. Adverse yaw can be reduced by having differential or frise-type ailerons, coupling controls, using spoilers, or having slot-cum-aileron controls.
Fonte1
KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
Definição2
A flight condition at the beginning of a turn in which the nose of the aircraft starts to move in the direction opposite the direction the turn is being made, caused by the induced drag produced by the downward-deflected tip holding back the wing as it begins to rise.
Fonte2
FEDERAL AVIATION ADMINISTRATION. Aircraft flying handbook. Washington, 2004. Disponível em: http://www.faa.gov/library/manuals/aircraft/media/FAA-H-8083-5.pdf. Acesso em: 09 maio 2012.
Fonte3
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual on aeroplane upset prevention and recovery training. Montreal, 2014. (Doc. 10011 AN/506).
Contexto
At slow speed and high thrust on the remaining engine(s), the autopilot (A/P) on some aeroplanes is generally incapable of holding the correct attitude against an adverse yaw condition, which may result in an upset.
Subárea1
Aerodynamics
Related Term
yaw
Português
guinada adversa
Imagem

Adverse yaw mechanism diagram

Adverse yaw mechanism diagram.

Fonte: http://en.wikipedia.org/wiki/File:Adverse_yaw.png