RobR, "limit the transverse flow and you limit the induced drag of sucking a vortice along in the wing tips wake."
I have been running the numbers trying to use increased camber and chord to equalize the pressure from the top to bottom "limiting the transverse flow" it starts looking like a triangular sail : (
RobR, "At the end of the day I am quite sure an endplate will provide the most satisfactory fix, and it wont weigh more than a few pounds at most."
Yeah you are probably right. The downside risk is very low and it is probably easier than simply fairing the wingtip anyway.
Talador