In article ,
BruceGreeff wrote:

As with all things soaring - it depends.



When asked what airfoil he used on his HP winglets, Dick Schreder
replied "I use the ROF-POB airfoil. Questioned further he elaborated
"Round on front-pointy on back".

H301 "WB" "Why yes dear, I'd much rather go with you to pick out
countertops than fly my glider."