Talk:Lift-induced drag

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According to what is written it could be understood that there is two sources of induced drag: Due to lift generation( could be understood that it appears in 2-Dimentional flow) Due to tip effect (could be understood as 3-Dimentional since tip vortices are 3-d) the question is:

what is the equation of induced drag in 2-D flow?
what is the equation of induced drag in 3-D flow?

IF ANY ONE CAN HELP ME please mail me at mohamadcharif@yahoo.com

The 2-D flow means the same as a wing od infinite span to chord ratio - and in this case the lift induced drag is zero.

In real 3-D case induced drag is the function Ci=(Cy)^2/Pi*A and is caused by the tip vortexes (mainly) and other trailing vortexes.

andrzejmat 16:13, 7 April 2006 (UTC)

[edit] Simplification

I'm thinking of adding this, early in the article: "Lift induced drag is caused by the lift component of the wing being rotated backwards relative to the aircraft's motion, resulting in a drag component." Seem reasonable? Mat-C 16:31, 24 August 2005 (UTC)

This is how the article originally defined Lift-Induced drag, but since then others have taken issue with this approach saying that it's an over-simplistic picture and not reflective of what's truly going on. If you check through the history you'll see this, inclusing a diagram (which I drew) which is no longer used in the article. Graham 00:11, 25 August 2005 (UTC)

[edit] Error

"k is the factor by which the induced drag exceeds that of a wing of infinite span typically 1.05 to 1.15" is not true of course. Not" a wing of infinite span", but should be there "a wing of otimum (eliptical) planform."

andrzejmat 16:13, 7 April 2006 (UTC)

Agreed.--FHBridges 17:12, 13 June 2006 (UTC)