Induced drag

Induced drag is caused by the generation of lift. It is created by the vortices at the tip of an aircraft's wing. The magnitude of induced drag depends on the amount of lift being generated by the wing and on the shape and size of the wing.

Induced drag is inherent whenever an airfoil is producing lift, and in fact, this type of drag is inseparable from the production of lift. It is always present if lift is produced. The amount of induced drag varies with the square of the airspeed.

Induced drag. Drag caused by the same factors that produce lift; its amount varies inversely with airspeed. As airspeed decreases, the angle of attack must increase, in turn increasing induced drag.

Induced Drag
Resistance of a wing to forward movement due to disturbance of the surrounding air and related to the lift produced by the wing.
See also: Profile Drag.

INDUCED DRAG - is caused by that element of the air deflected downward which is not vertical to the flight path but is tilted slightly rearward from it.

Induced Drag: That part of the drag which is caused by vortices at the wing tips. It is the drag which results from the lift. Pushing a wing through the air, to generate lift in it, causes violent disturbance of the air at the tips.

Induced Drag Reduction
Induced drag is inversely proportional to the speed (velocity) of the air. As explained earlier, the angle of attack (represented by CL and CD), is inversely proportional to the air velocity.

Induced Drag Wing drag associated with lift
International Standard Atmosphere An imaginary atmosphere that assumes at mean sea level a temperature of 15° C and a pressure of 1,013Â-2 millibars, and a fall in temperature of 6Â-5°C per 1, ...

Induced Drag - When a male copilot is persuaded by a kinky female flight attendant to put on women's clothes against his will.
...

Lift Induced Drag: Drag resulting from turbulence originating in the wingtip vortices that are created when the wings begin to generate lift.
LDA: Landing Distance Available.
LRA: Landing Run Available.

* Differential Induced Drag
Example 3: Consider an aircraft where there is a lot of mass located far away from the roll axis. A twin with heavy engines mounted way out on the wings, plus tip-tanks full of fuel, is a good example.

At low Mach numbers induced drag dominates drag concerns. Airplanes during takeoff and gliders are most concerned with induced drag. One way to reduce induced drag is to increase the aspect ratio of the lifting surface.

Curve "B" shows how induced drag decreases as aircraft airspeed increases. At a hover, or at lower airspeeds, induced drag is highest. It decreases as airspeed increases and the helicopter moves into undisturbed air.

At cruise, a non-negligible amount of the drag of a modern wing is induced drag. Parasitic drag, which dominates at cruise, of a Boeing 747 wing is only equivalent to that of a 1/2-inch cable of the same length.

Again caused by ground effect which reduces induced drag. But when the aircraft leaves ground effect it can settle back onto the runway due to a sudden increase of induced drag.

Drag curve. The curve created when plotting induced drag and parasite drag.
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The result is less induced drag and a more vertical lift vector. The lift needed to sustain a hover can be produced with a reduced angle of attack and less power because of the more vertical lift vector: ...

Now the airplane’s operating close to the bottom of its drag curve. Increasing the angle of attack for the roundout and flare results in an increase in induced drag, which minimizes your chance of floating.

The other drag contributions are airfoil shape, wind induced drag, tail drag, fuselage and landing gear drag, interference drag, cooling drag and a few more.

a longer wingspan than the Hershey bar wing and, thus, a higher aspect ratio (the proportion of the wingspan and the wing chord). In general, a higher aspect ratio contributes to better climb and cruise performance because of lower induced drag.

See also: Drag, Aircraft, Flight, Plane, Speed