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How does the wake from an aircraft forms?
Wake vortices are formed any time an aerofoil is producing lift. Lift is generated by the creation of a pressure differential over the wing surfaces. This causes it to move outwards under the wing towards the wingtip and curl up and over the upper surface of the wing. This starts the wake vortex.
What is aircraft wake turbulence?
Wake turbulence is a function of an aircraft producing lift, resulting in the formation of two counter-rotating vortices trailing behind the aircraft. Wake turbulence can impose rolling moments exceeding the roll-control authority of encountering aircraft, causing possible injury to occupants and damage to aircraft.
How does an airplane form wake turbulence when landing?
When landing behind a departing larger aircraft it is important to touchdown before the rotation point of that aircraft. During cruise flight, aircraft are typically traveling at a faster speed which requires a smaller angle of attack to achieve level flight, so the wake is reduced.
How is the strength of wake turbulence determined?
Air from below the wing is drawn around the wingtip into the region above the wing by the lower pressure above the wing, causing a vortex to trail from each wingtip. The strength of wingtip vortices is determined primarily by the weight and airspeed of the aircraft.
How are wake vortices formed on an airplane?
Viewed from behind the generating aircraft, the left vortex rotates clockwise and the right vortex rotates counter-clockwise. All aircraft produce wake turbulence1, more correctly called wingtip vortices or wake vortices. Wake vortices are formed any time an aerofoil is producing lift.
Which is the most dangerous part of wake turbulence?
Wingtip vortices make up the primary and most dangerous component of wake turbulence. Wake turbulence is especially hazardous in the region behind an aircraft in the takeoff or landing phases of flight. During take-off and landing, aircraft operate at high angle of attack.