Videos illustrating topics covered on this site: Birds
Geese Taking Flight (slow motion)from Edward Tufte
The sequence shows clearly that, during the downbeat, the wing is fully extended, offering maximum air resistance and thus producing 'lift'. During the upbeat, the wing is flexed at the 'wrist' and this greatly reduces air resistance. At the wing tips the primary feathers spread to form 'slots' which help to reduce turbulence and 'drag'.
Bird Flight in Slow Motionfrom ManyetikMavi
A bird photographed in high speed and then presented in slow motion video.
See: Birds: Structure and function
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