Bruce Hoult wrote:

But the spar does not have to deal with the extra lift on a *long*
moment arm. Well not all of it anyway.


Hmm ... well a deliberately non-lifting horizontal section at the tip
would reduce induced drag as well.

This could be done for one angle of attack, but I don't see how it could
be done for the usual range a glider uses. A winglet has the same angle
of attack, independent of the wing.
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Eric Greenwell
Washington State
USA