Every time I see a photo of a Hawk, I drool. I have my dribble sheet draped over the k/b right now...and that is just from thinking about it.

Actually elliptical dihedral is just the first step...now take those beautiful swooping tips and sweep them back, a bit like some of the extreme four taper rc gliders, and then a bit more...

I have it in my eye, but damned if I can draw it on paper.

Take it back and attach it to the wing? Nah!!! Remember the diamond wings and other attempts to avoid induced drag? Dont work for me, anyway.

The most extreme version, and the one that comes from about three different computer models, is the "C Wing". Brilliant concept. but it don't want to turn corners apparently. Not good for ff, perhaps for sloping?

<e> Actually, there is one thing that comes back to mind, and which is often missed in this discussion on induced drag.

The last, and most easily overcome, generator of induced drag is the wing plan.

Briefly, a straight plank generates most induced drag, a pure elliptical planform generates ZERO induced drag. A straight plank to 60% half span, then taper to 80% root chord is about 40%, the multi-taper plan forms probably are close to elliptical - close to zero.

This side of the argument - if I got it right - links local wing loading with the amount of induced drag.