Relative wind. Direction of the airflow produced by an object moving through the air.
Relative wind The flow of air relative to an aircraft, caused by its motion through the air.
Roll A maneuver in which an aircraft rotates about its longitudinal axis.
Relative wind
Remote communications outlet (RCO)
Required navigation performance (RNP) ...
Relative wind is created by movement of an airfoil through the air. As an example, consider a person sitting in an automobile on a no-wind day with a hand extended out the window. There is no airflow about the hand since the automobile is not moving.
Relative wind is the motion of the airplane through the air. During flight only the forward motion of the airplane produces relative wind-the direction and speed of the wind have no effect on the relative wind.
The relative wind acting on the airplane produces a certain amount of force which is called (unsurprisingly) the total aerodynamic force. This force can be resolved into components, called lift and drag, as shown in figure 4.1.
Note that the relative wind is the combination of the horizontal and vertical motions. To the poor little guy about to be squished again, it seems to be coming at him from an angle, somewhere between the vertical and horizontal.
Since the rotor is spinning, there will be relative wind due to this spin, which is labelled as Relative Wind due to Rotor.
When an airplane is flying at a high speed with a low angle of attack, and suddenly encounters a vertical current of air moving upward, the relative wind changes to an upward direction as it meets the airfoil.
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).
The swept planform, when yawed out of the relative wind, creates more lift on the advancing wing and also more drag, stabilizing the wing in yaw.
Angle of Attack compared to Relative Wind
Reducing airspeed
Reducing control effectiveness
Pre-stall buffet
Nose high attitude (straight and level stalls)
Stall warning device alarm ...
ANGEL OF ATTACK (AOA)
The angle between the chord line of the wing of an aircraft and the relative wind.
ANGLE OF ATTACK
The angle that the wing penetrates the air. As the angle of attack increases so does lift, up to a point (and drag).
Lift The component in a vertical, upward direction in straight and level flight of the resultant force created by the relative wind acting on the lifting surfaces of an aeroplane ...
AOA (Angle Of Attack)
The angle between the chord line of the wing of an aircraft and the relative wind ...
In flight, flaps can be used to further slow down an already slow airplane (do not apply them when in maximum cruise configuration, as the relative wind could tear them off) by increasing drag and at the same time lowering the speed at which the ...
SWEEPBACK - A backward inclination of an airfoil from root to tip in a way that causes the leading edge and often the trailing edge to meet relative wind obliquely, as wingforms that are swept back.
The pilot must understand and appreciate factors such as airspeed, pitch attitude, load factor, relative wind, power setting, ...
 See also: Lift, Wind, Direct, Speed, Plane
  
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