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Re: Wilkinson's new pterosaur paper, J. Headden

The actinofibrils are intercalated. They do not run full length. They can be longitudinally lengthened (and shortened) by shifting relative to one another along their lengths. This is one of the primary mechanisms for controlling the aeroelastic number and inhibiting flutter. It can also be used for roll control.

----- Original Message ----- From: "David Peters" <davidrpeters@earthlink.net>
To: <qilongia@yahoo.com>
Cc: <dinosaur@usc.edu>
Sent: Saturday, July 14, 2007 5:11 AM
Subject: Re: Wilkinson's new pterosaur paper, J. Headden

Fibers beyond the elbow can be rotated to show their maximum chord length. They cannot be longitudinally lengthened as I demonstrated with the Zittel wing (ref. Peters, D. 2002b. A New Model for the Evolution of the Pterosaur Wing – with a twist. - Historical Biology 15: 277–301).