RE: using different airfoils from root to tip on glider wing.
"The difference between the root zero lift angle and the tip zero lift angle determines the geometric washout you will need."
now i think i understand sure.
if root zero lift angle is say 3.5 degrees and tip zero lift angle is 3.75 degrees caused by increased camber then i need to washout tip by .25 degrees of geometric washout to prevent washin which cause tipstall.
sound correct?
Hai Dang