angle of attack

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angle of attack

[′aŋ·gəl əv ə′tak]
(aerospace engineering)
The angle between a reference line which is fixed with respect to an airframe (usually the longitudinal axis) and the direction of movement of the body.
(mining engineering)
The angle in a mine fan made by the direction of air approach and the chord of the aerofoil section.

Angle of Attack

 

the angle between the direction of trans-lational motion of a body and some characteristic direction on the body. The characteristic direction may be, for example, a chord of an airplane wing or the axis of symmetry of a projectile or a rocket.

angle of attack

angle of attackclick for a larger image
Angle of attack is the angle between the wing chord plane and the relative air flow.
The acute angle between the chord line and the relative airflow. Often referred to as an angle of incidence—which it is not. The angle of attack should not be confused with the pitch angle or attitude of aircraft, which are angles relative to the horizontal while the angle of attack is in respect to the relative airflow. It is referred to also as alpha (α).
References in periodicals archive ?
However, even though the extra computational time for obtaining such accurate longitudinal contact location is small, also the benefits are small, as simulations have shown that the effect of the longitudinal location of the contact point on the vehicle simulation is negligible for contact angles up to 40[degrees] and angles of attack up to 1[degrees]; for derailment scenarios with contact angles up to 70[degrees] further investigation is necessary.
Passage from separated to non-separated flow performance occurs at lower angles of attack than the critical angles of attack that correspond to the beginning of flow separation.
The camber reduction and the change in the angle of attack definition reduce the lift coefficient over the entire range of angles of attack.
L] obtained for the different angles of attack and for the different thumb positions are presented for a flow velocity of 2.
8: Effect of vertical position of WT on fan input power for rotor masses (1) & (2) at different angles of attack (A= 30[degrees] and B=120[degrees])
The results were expressed as time dependent series representing the angles of flexion of the leg and monofin and the angles of attack of the monofin surface parts (Figure 2).
When courts recently ruled that peer-to-peer technology is legal, the urgency of the RIAA's other angles of attack were heightened,'' a company spokesman said in a printed statement.
At high angles of attack, yaw power diminishes to the point that coordinated turns without slipping sideways are impossible.
The missile's telemetry data confirmed the pre-fire simulated results, which predicted the safe separation from the aircraft and the control response of the autopilot guided missile under high G-loads and angles of attack.
In these segments, Blaine and Scott demonstrate and explain basic strikes, five angles of attack and their defenses, footwork, and balance in this high-impact discipline.
At high angles of attack, accurate airspeed indications are difficult due to position error.