Don’t think I’ve ever seen a parabolic natural log. The ones I see tend to be pretty straight or bowed in the middle.
Regarding the wind. A 12 or 1 o’clock wind would be pretty straight on too. Wouldn’t think it would have much effect.
But math was never my strong point
A wind from 11:00, 1:00, 7:00 or 5:00 is 30 degrees off so crosswind effect would be half that of the same wind from 3:00 or 9:00.
