While doing some calculation on total drag, I may have swerved, uncontrolled, into a truth. I found that total drag equals static (CD0) drag + induced (CDi) drag, and that CDi has to do with dynamic pressure and is also influenced by AOA. So I found that as speed increased, induced drag increased, which made sense to me, since dynamic pressure would be increasing. But I also found that below a certain speed, induced drag started going up again! What was happening? AOA was going up, is what was happening! This implied an “optimum” speed, at which induced drag, and therefore total drag, would be at a minimum. Might this speed be related to that which might produce max range? Did I stumble into something important, or is my math out to lunch (again)?

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