I think Anhedral is rarely used to change stability. There are far more effective and efficient ways to decrease stability than
Bending the whole wing down. Most of the time a full size plane will have anhedral
Because for other reasons. Most common use is with wing tip landing gear. A high wing plane line the
Harrier or B52 would not be very unpractical with very long wing mounted gear. Also I think, with high wing planes, anhedral is
Used to get into ground effect sooner. The C17, witch is primary a heavy lifter, would benefit greatly by keeping its wings
Close to the ground as it can . There Is no point in changing the stability of a C17. There is no question anhedral does change
Stability a small amount, but in most cases anhedral is built into planes for other reasons. FWIW I can’t think of any US fighter that
Have anhedral, except the F104 star fighter.

Eddie Weeks