So ok, vorticies are bad because they create turbulent flow, that is destabilizing and decreases wing efficiency and it's lift. How come, then, that geese fly in a V formation which puts the wings of the bag goose right into the vorticity of the lead goose? How come they use less energy flying that way? Is this the same principle as in a Su-33 that there are small wings in front of the main wing? How come that is good, doesn't that put the back wing into vortex of the front wing?

Lafayette.