effective angle of attack

effective angle of attack

[ə¦fek·tiv ‚aŋ·gəl əv ə′tak]
(aerospace engineering)
That part of a given angle of attack that lies between the chord of an airfoil and a line representing the resultant velocity of the disturbed airflow.

effective angle of attack

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That part of a given angle of attack that lies between the chord of an airfoil and a line representing the resultant velocity of the disturbed flow. This angle is measured on a finite wing, but it has the same effective magnitude as that of an angle of attack for the infinite aspect ratio measured on a theoretical airfoil between the chord and the direction of the undisturbed airflow. To produce the same amount of lift, an airfoil of finite span must be set at a greater angle of attack than would be necessary if the airfoil were of infinite span, because the downwash velocity produced by the airfoil tip vortices of the finite airfoil tend to reduce the lifting effectiveness of its angle of attack. Also called an angle of attack for infinite aspect ratio.
References in periodicals archive ?
For the presence of the flow interaction between the fore wing and the hind wing, the wake generated by the fore wing will be hampered by the hind wing, which will also change the effective angle of attack of the hind wing, so the aerodynamic characteristics of the tandem airfoil configuration are different from the single-wing case.
where the effective angle of attack [[alpha].sub.E](t) is defined as
Ultraviolet light takes a different and more effective angle of attack: it scrambles the DNA of microbes, so they can neither make you ill nor reproduce.
As a result of this flow phenomenon, the effective angle of attack of the wing is lowered; an aircraft must fly at a higher angle of attack to compensate.