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Unformatted text preview: Biology 427 Biomechanics Lecture 20. Gliding flight: a soar topic Recap basics of lift and circulation The consequences of aspect ratio The lift coefficient (C L ) Drag coefficients for wings Drag and lift together (polar plots) Gliding flight Lift and Circulation: Subtract the mean velocity from all of these vectors (P 2 P 1) / ! = (u 1 2 u 2 2 )/2 Lift and Circulation: (P 2 P 1) / ! = (u 1 2 u 2 2 )/2 With the mean subtracted, there is and effective circulation ( " )about the wing. Greater " implies a greater velocity Lift and Circulation: (P 2 P 1) / ! = (u 1 2 u 2 2 )/2 With the mean subtracted, there is and effective circulation ( " )about the wing. Greater " implies a greater velocity difference Message: lift can be measured by the amount of circulation held by a wing L = 2 ! ! U 2 c sin( # ) " = 2 ! ! U c sin( # ) L = ! U " Circulation is conserved (Kelvins circulation theorem) For every clockwise spin there is a counter clockwise one elsewhere in the fluid.one elsewhere in the fluid....
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This note was uploaded on 06/03/2008 for the course BIOL 427 taught by Professor Daniels during the Spring '08 term at University of Washington.
 Spring '08
 daniels
 Biomechanics

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