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Re: Archie a non-flyer? (was:Re: origin of bats/reply 2 to TMK)

On Wed, Jun 25, 2008 at 4:02 PM, Mike Habib <habib@jhmi.edu> wrote:
>  Effects that are associated with increased lift or drag coefficients need 
> not be a
> direct result of increased drag or lift.

Surely. But if it was an *indirect* result of increased drag the
latter could be a target for selection.

> The asymmetric structure results in reduced mass requirements because the
> resultant shape is more resistant to twisting under aerodynamic load.  A
> symmetric feather can be built to resist the loads just as well, but at the
> cost of being more robust, and thus more massive.  Therefore, an asymmetric
> feather is structurally advantageous in terms of material distribution.

How much weight it could reduce?

>> With no effect on airflux?
> What exactly do you mean by "airflux" in this case?

Pattern of the movement of the molecules in the air.


Roberto Takata