Why do some aircraft have upturned wing tips?
The F-4 Delusion Jet Fighter was the first one i ever saw with this but that was just at an angel.
Then several years ago the C-17 Globemaster III was on a video and its tips were even up and down. (if i saw em correctly).
Since then ive seen a
Normally the explanation for winglets is to reduce induced drag (caused by vortices or whirling air mass over the outer wing). Restrict the drag you, increase spanwise lift. In most cases (it depends on the winglet exemplar) the induced drag is reduced by increasing the vertical










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