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 ?
The structure and characteristics of separated flows significantly depend on their kinematic performances--velocity, angles of attack, and flow parameters such as pressure, density and temperature--and it depends on the direction of their change within the interval of certain values.
Angles of attack of hand models of 0[degrees], 45[degrees] and 90[degrees], with a sweep back angle of 0[degrees] (thumb as the leading edge) were used for the calculations (Schleihauf, 1979).
That airplane was designed to operate at low speeds and at high angles of attack - areas where aircraft tend to stall and become uncontrollable.
Nonetheless, Angles of Attack is a fine effort that tells the story of one of the Navy's stalwart aviation communities during its last combat deployment.
At certain angles of attack, it would close off the fuel flow to the engine, causing it to stall.
Integrated into the vehicle's control systems, the system provided precise control at high angles of attack where conventional aircraft had lost aerodynamic control.
Since different airfoils (wing designs) behave differently in an air stream, the three models are expected to differ under varying angles of attack and wind speed.
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.
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.
Objectives include expanding the angle-of-attack envelope to 35 degrees and demonstrating agility that is equal to or better than that of current fighter aircraft at these elevated 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.