## Aviation

What is what? Everything you always wanted to know.
 Home »

# Angle of attack

Angle of attack
The angle of attack is the angle between the chord line of an airfoil and the direction in which the aircraft is moving (relative wind).

Angle of Attack
Tags: Aerodynamics, Aircraft
The angle of attack is defined as the angle between the plane of the wing (airfoil
chord) and the direction of motion (free stream velocity). The angle of attack can be varied to increase or decrease the lift acting on the wing.

Angle of attack is a very important and useful concept. Most of the airplane's critical performance numbers are more closely related to angle of attack than to anything else. Let's explore what this means.

Angle of Attack, (AOA)
Definition: The angle of attack is the angle between the chord of the airfoil (determined by wing form) and the incoming relative wind.

angle of attack
Angle of attack is an aerodynamic angle and is illustrated here: ...

The Effect of Roll on the ~
It is a widely accepted that the ~ increases when a wing drops while the ~ decreases when a wing rises, but this is rarely explained.

~ The angle at which a wing meets the relative wind.
ATIS (Automated Terminal Information Service) A continuous broadcast of airport information, commonly found at tower-controlled airports. It usually includes weather information, runways in use, and any important notices.

~: Pick-up lines that pilots use.
Stall: Technique used to explain to the bank why your car payment is late.

~
The angle between the relative wind and the chord line of the wing.
ATA
Actual Time of Arrival ...

~ (AoA): Angle at which wings meet airflow.
APU: Auxiliary Power Unit.
Artificial horizon (AH): Instrument displaying aircraft attitude in relation to real horizon.

~ The amount of pitch at which an airfoil is flying. By adjusting the ~, the efficiency of the wing/blade is effected. More precisely, the angle between the chord of an airfoil and the wind.

~ - (AOA) The acute angle at which a moving airfoil meets the airstream.
ANGLE OF INCIDENCE - (AOI) The angle at which an airfoil is normally fixed in relation to the longitudinal axis of an aircraft.

~
The angle at which a wing strikes the air stream.
Angle of Incidence ...

~.
The difference between pitch and the air-referenced flight path angle; the angle between the aircraft center line and the airspeed vector in the vertical plane, positive when the nose is up; Symbols: alpha; Typical Units: rad, deg; ...

AOA (~)
The angle between the chord line of the wing of an aircraft and the relative wind ...

Fig 14 ~ versus speed for straight and level flight and for a 2-g turn.
Wing vortices
One might ask what the downwash from a wing looks like. The downwash comes off the wing as a sheet and is related to the details of the load distribution on the wing.

~ Angle between the chord line of an aerofoil and the relative airstream
AOPA Aircraft Owners & Pilot's Association
Apron An area of the aerodrome designed to facilitate the safe movements of aircraft on the ground ...

~: Pick-up lines that pilots use.
Arresting Gear: A Policeman's equipment.
Bank: The folks who hold the lien on most pilots' cars.

~ vane position potentiometer.
(b)
Angle of side slip vane position potentiometer.

~ - Pick-up lines that pilots use.
Arctic Frost - Attitude shown by uncooperative stewardess (also see "Horizontally Opposed").
Arresting Gear - Police equipment used for keeping order at airport parties.

~ - Angle at which the air-stream meets an aerofoil surface.

ANGLE OF INCIDENCE - Angle at which an airfoil surface is normally set in relation to the fore and aft axis of the airframe structure.

~
The angle that the wing penetrates the air. As the ~ increases so does lift, up to a point (and drag).

The ~ of the tail rotor is controlled by the pilot's anti-torque pedals (they're not "rudder pedals" in a helicopter). The pedals are typically connected to the pitch change mechanism by either push pull tubes, or by cables.

When ~ is increased:
upper surface lift increases relative to the lower surface force. Since the two vectors are not located at the same point along the chord line, a twisting force is exerted about the center of pressure.

AoA ~ (see 'attack' below).
AOOT Aktsionernoye Obshchestvo Oktrytogo Tipa (Russian company constitution).
APACHE Armement Propulsee A Charges Ejectables - French weapons dispenser weapon from which StormShadow/SCALP EG weapons are derived.

aircraft ~ (AOA, alpha)
aircraft angle of sideslip (AOS, beta)
static pressure (Ps)
total pressure (Pt, pitot pressure)
outside air temperature (OAT)
total air temperature (TAT) ...

So, what ~ do we hold and how do we measure it? The answers are, we don’t know what ~ is needed and we have no accurate way of measuring it. About the best we can do is make guestimates as to what angle is “a lot' and what is “not very much.

On the Trim panel you can select to have the program compute the trimmed ~ or your can input your own flight ~ by using the drop menu at the upper right. If you decide to input your ~, you then input the Angle in degrees.

Because the ~ is relatively high, the airspeed is relatively slow, and the power setting is high, the airplane will have a tendency to roll and yaw to the left due to turning tendencies created by the rotating propeller.

During this training, the flight instructor should emphasize that the direct cause of every stall is an excessive ~.

They observed an interesting maneuver employed by a pigeon which seemed to secure its lateral balance in exactly the way they wanted; this bird was seen to give its two wings each a different ~ -~ whereat one wing would lift more forcibly than the other, ...

At low speeds, a higher ~ is needed to give enough lift, and the aircraft will fly with a nose-high attitude.

Leading edge slats prevent the stall up to approximately 30 degrees incidence (~) by picking up a lot of air from below, where the slot is large (Figure 3), ...

To achieve this high ~, the fuselage geometry must allow ground clearance at take off and on landing (see figure 2).

The elevators control the ~ of the wings. When back pressure is applied on the control wheel, the tail lowers and the nose raises, increasing the ~. Conversely, when forward pressure is applied, the tail raises and the nose lowers, decreasing the ~.

The elevator! Controller of so many things: ~, airspeed, G-load, stalling, turning and whether or not we end up breaking the airplane, too. So fundamental, yet so often omitted during normal flight training.

Stall
Results when a wing exceeds its ~ (angle between airfoil and relative flow of wind), the airflow is disrupted, and the wing no longer produces lift, with sudden drop and possible loss of control.

That oscillation is called a phugoid. ~ stays near-constant, but pitch varies because the airspeed and altitude are constantly interchanging until balance is regained.

Static longitudinal stability. The aerodynamic pitching moments required to return the aircraft to the equilibrium ~.
Static pressure. Pressure of air that is still, or not moving, measured perpendicular to the surface of the aircraft.

Small, aerodynamic surfaces on the leading edge of the wings of fixed aircraft which, when deployed, allow the wing to operate at a higher ~. They are usually used while landing or performing manoeuvres but are retracted in normal flight to minimize drag.
SLOTS ...

A tail surface that acts as both stabilizer and control surface. The moveable surface can minimize the local ~, so this form of tail surface is considered to be less susceptible to tail stall than a standard horizontal stabilizer.
Stability ...

Occurs when lift-producing airflow over the wings is disrupted or lost because angle of wings to airflow (~) is too high. Most commonly occurs when a pilot doesn't maintain sufficient airspeed in a climb or turn. Student pilots are trained in stall prevention, recognition and recovery.

A measure of the degree to which an aircraft's nose tilts up or down. Also a measure of the ~ of a propeller.
pitot tube ...

The tail fin determines the directional stability.
If a gust of wind strikes the aircraft from the right it will be in a slip and the fin
will get an ~ causing the aircraft to yaw until the slip is eliminated.

In this scenario you are well behind the Ontario glider (second of the oversize drones), and overtaking it. In this con-figuration it offers you the minimum target surface, so you may want to change your ~. Contact altitude is about 3140 feet.

Stall - A loss of lift when the ~ increases to a point where the flow of air breaks away from a wing or airfoil, causing the wing to drop.
Stall Speed - The speed at which an aircraft wing ceases to generate adequate lift to keep the aircraft flying.

See also: What is the meaning of Speed, Flight, Aircraft, Lift, Up?