What Is Induced Drag?

[@qzboanynj]

Yes! This is simple and clear. A lot of other videos talking about vortices causes induced drag and I think that argument is wrong. Induced drag is caused by angle of attack and vortices causes down wash airflow, which reduced the lift. In order to create the same amount of lift, angle of attack needs to be increased, which in turn creates more induced drag.

[@apauloh]

I really REALLY needed to see that chart and the airfoils at 1:00 to really understand. Thank you so much!

[@maxcfi7718]

you’re welcome!

[@Simone-dx6op]

What you explain in this video is shape resistance/drag, not induced drag. Induced drag has nothing to do with the shape or the angle of attack (AoA) of a wing (it can be dependent on the AoA, but it's not defined as caused by it)

[@paolonemeno4870]

Are induce drag only caused by wingtip vortices?

[@Simone-dx6op]

@@paolonemeno4870 Yeah but in order to to be precise, it's not 'caused by', it's a definition: induced drag is defined as the drag generated by a finite wingspan/aspect ratio.

[@qzboanynj]

Disagree. FAA Airplane Flying Handbook has the following definition: "That part of total drag which is created by the production of lift" is called induced drag. The angle of attack creates both lift and drag. That drag is the induced drag. Because pressure under the wing is higher than above the wing and the air flow pushed from the side of the wing will create air flow rotation which press the wing from top. In order to generate more lift, angle of attack has to be increased, which causes more drag. Some aviation website even claim that no vortices no induced drag, that is clearly wrong. You can put a rectangular "wing" in a tunnel with the wing length equal to the tunnel width, so no air can be pushed out from the side of the wing (i.e. no vortices), but you still need angle of attack to create both lift and drag. Also vortices can be used to increase lift (like canard) or compensate the "bad" vortices" (like double delta wing) which in turn reduce the drag. Vortex itself has no drag. But the rotation of air can effect the lift in "bad" or "good" way (depend on how the air rotation hit the wing), which may cause more or less angle of attack and angle of attack creates the drag - that is induced drag.

[@WG-0]

thank you!