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Re: More on Argentavis

At 05:37 2007-07-04, jrc wrote:

Note that many insects, dragonflies for instance do have rather effective aerofoils. The veins are oriented to force the airfoil shape under load.

It is a common misconception that a wing has to have "airfoil shape" to work. Many aircraft have symmetric wings profiles which work perfectly well provided the wing has a positive angle of attack. Remember that a wing works by deflecting the airstream downwards. Any shape that does this will work as a wing provided the speed is high enough. Of course some shapes are better than others in specific cases (gnats, dragonflies, teratorns, pterosaurs, 747's, XB-70's, space shuttles etc).

Tommy Tyrberg