Hi Noel; Yes, by golly I have been reading up on winglets and it seems that if they are canted at 15 degrees to the wing and with -2 to -4 degrees (toed out) incidence angle is supposed to be best. You can read about it here.
http://www.nasa.gov/centers/dryden/about/Organizations/Technology/Facts/TF-2004-15-DFRC.html Regards Myron (Dan) Freeman Indpls, Ind. 46203 USA mfreem...@indy.rr.com
