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Author Topic: Flight  (Read 5757 times)

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AGelbert

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The Amazing Butterfly Funnel Effect
« on: June 04, 2014, 10:45:09 pm »


 

Amazing variety of design

One particular variant of butterfly stroke commonly called ‘funnel formation’ takes creative design to new heights. Here our focus is on what happens immediately after the wings pause at the end of the down stroke.

The wing tips just touch at the beginning of the upstroke: at this point this is a mirror image of the opening phase of the down stroke. As the upstroke progresses, however, two distinct flexural forces begin to simultaneously act on the wings—one along the chord10 of the wings from leading to trailing edge; the second acting at 90˚ to the first.


The two forces draw the wings into a funnel; the leading edges form the mouth, and the trailing edges compose the tapered body. As the funnel enlarges, air flows into the funnel mouth and the rear wing seal maintains the flow.



The funnel effect works until the wings separate: the instant that air leaks past the wing tips the effect is gone. The bonus for the butterfly is that by this point in the wing cycle the funnel has done its job; the wings are now moving fast enough for conventional aerodynamics to take over and generate sufficient lift.





http://creation.com/butterfly-designer-wings
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

 

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