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Originally Posted by bagmaker
OK, I can get the theory (OR can I?) with winglets to reduce wingtip vortices.
Surely the best direction for the tip is DOWN!, [...] Enlighten me, O knowledgable ones!
Wayne
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i'm certainly not that knowledgeable person, but i have heard people whom i would consider quite knowledgeable say that the orientation of the winglet really doesn't matter - it could be flat, or pointed down. either way it reduces induced drag. however, costly hangar space is costlier if the wingspan is wider, and i imagine crosswind landings could become more interesting with winglets pointed down.
:-)
frank