# angle of attack

(redirected from Attack angle)
Also found in: Thesaurus, Encyclopedia.
Related to Attack angle: Critical angle of attack

## angle of attack

n.
The acute angle between the chord of an airfoil and a line representing the undisturbed relative airflow.

## angle of attack

n
(Aeronautics) the acute angle between the chord line of an aerofoil and the undisturbed relative airflow. Also called: angle of incidence

## an′gle of attack′

n.
the acute angle between the chord of an aircraft wing or other airfoil and the direction of airflow.
[1905–10]
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 angle of attack - the acute angle between the direction of the undisturbed relative wind and the chord of an airfoilangle of incidence, incidence angle - the angle that a line makes with a line perpendicular to the surface at the point of incidence
References in periodicals archive ?
But Director General Oscar Albayalde, chief of the Philippine National Police (PNP), said that the retaliatory attack angle following the Jolo Catholic church blast that left 21 people dead and more than 100 others injured is just one of the theories that investigators are pursuing.
Thereby, the steering capability of wheelset was decreased and caused a greater attack angle through the curve negotiating, then the two points contact of the wheel/rail will seriously affecting the running stability of railway vehicle.
In the equation, S is the reference area of the "leader;" [bar.L] is the reference length of the "leader;" m is the mass of the "leader;" [alpha] and [beta] are the attack angle and sideslip angle, respectively; [[omega].sub.z] and [[omega].sub.y] are the pitch angular velocity and yaw rate, respectively; and [mathematical expression not reproducible] are the disturbance and uncertain disturbance of the various links of the system.
The influences of pitch-to-height ratio, rib height-to-hydraulic diameter ratio, and flow attack angle on flow and heat transfer were considered for Re = 4000 = 12,000.
where [alpha] is the angle of attack, [w.sub.z] is the angular pitch rate, [[delta].sub.z] is the deflection angle for pitch control, m is the missile mass, Q is the dynamic pressure, S is the aerodynamic reference area, L is the reference length, P is the thrust of the missile, [J.sub.z] is the moment of the inertia about z-axis, [c.sup.[alpha].sub.y] is the lift force derivative with respect to the attack angle, [mathematical expression not reproducible] represent the pitch moment derivatives with respect to the attack angle, the non-dimensional angular pitch rate, and the deflection angle for pitch control, respectively.
Existing studies have largely focused on the effect of the attack angle, tilt angle, rake angle, and clearance angle on the cutting performance of a drum and the influence of the angle setting sequence on the final values of tilt and attack angles [14].
The effects of parameters, relative baffle gap, baffle height, baffle pitch, and flow attack angle, were studied.
The attack angle [alpha] is positive in the upper direction (swing movement), whereas the deflection h is positively measured in the downward direction.
The factors include the velocity, attack angle, and flight height.
Considering that the actual variation of the inflow direction will not be too large, the aerodynamic characteristics were only measured at the range of wind attack angle from -45[degrees] to 45[degrees] with an interval of 5[degrees].
Based on the parameters of Table 1 and formula (16), we can calculate the numerical values of [D.sub.Nor] as 0.0016 under 0[degrees] attack angle, 0.00196 under 15[degrees] attack angle, 0.00219 under 30[degrees] attack angle, 0.00226 under 45[degrees] attack angle, 0.00219 under 60[degrees] attack angle, and 0.00196 under 75[degrees] attack angle.

Site: Follow: Share:
Open / Close