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John, From memory the Jantar 3 has a different airfoil to
the 2. Re, re-profiling the wings. If you have a lot of time and patience
you will improve the performance, but be very careful or you might make things
worse. The leading edge is the most important, followed by the spar area. Aft of
the spar is not too important. Yes, winglets do improve performance by reducing
the drag at the wingtips. There is a book around that covers both winglets
and profiling of wings. I think it is called "Perfomance Enhancement" or
something similar. I did have a copy but it eludes me at the moment.
Cheers, Ron Baker.
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