Not so sure about dirty v clean, but at low speeds clean isn't very effecient
at generating lift. That means larger angles of attack, more air displaced,
maybe a bigger vortex.
Clean, the angle of attack of the WINGTIPS is greater for the same lift at the
same speed. The vortex happens at the wingtips, not the wing as a whole.
--
Wm. Donald (Don) Tabor Jr., DDS
PP-ASEL
Chesapeake, VA - CPK, PVG
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