Prof2MDA,
Thanks for a number of good and technically accurate posts. It is nice to see that some people still believe in having a firm technical understanding of a concept before attempting to preach about them!
I would suggest that posts like 747FOCAL's are made with a certian degree of ignorance. Do you have and particular merit on which to state you claim that winglets are useless, or are you merely providing us with your well informed opinion?
Cheers,
Cuban_8