If I'm reading this right induced lift for constant area is inversely
proportional to span, and goes up linearly with area.

At more or less constant chord, area is linear with span, so the idea
would be to have chord go down as span goes up. I'd guess e starts
changing as the wing grows too slender.

That pretty much gives me what I wanted to know. I'd guess higher order
terms have to come into play with increasing airspeed.

Thanks

Tony