Understanding Induced Drag

[AlanG]

I'm trying to understand the drag and thrust curves of the plane I'm building. Profile/form drag - no problem. My sticking point right now is induced drag. All of the graphics on the topic show induced drag decreasing rapidly with increasing speed. But the equations I find on the subject, as on page 3 of http://www.lancair.net/archives/Drag_Reduction_Part_1.pdf show induced drag as being proportional to the square of speed (i.e., increasing as speed increases). What am I missing ?

Thanks,
Alan

 

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