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Re: Scientific American feathers paper



An asymmetrical vane is not required for either airfoil production or
flight.  The asymmetric vane does provide for a lighter flight feather
and a reduced cost of moult in flying animals and for some self sealing
properties under some circumstances.
JimC

Tim Williams wrote:
 
> Stage 5: Closed asymmetrical vane.  Needed for airfoil production and
> flight.