[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: was: Pterosaur.net now: pteroid



Actually, it's not constant, even when not flapping -- but it isn't particularly large in magnitude either. I'm not going to take time right now to quantify it exactly for any particular species, but for a 20 Kg animal while soaring, it is on the very loose order of a half kilogram force acting to extend each elbow. The moment arm will be roughly 1/3 the distance from the elbow to the wingtip. For an animal with a 4.8 meter span, that would be about 2/3 meter and would result in the elbow resisting an extension moment on the rough order of something like 0.3 Kg-M or 2.4 ft-lb. Not enough to write home about.
JimC

----- Original Message ----- From: "Mike Habib" <habib@jhmi.edu>
To: "David Peters" <davidpeters@att.net>
Cc: "Mark Witton" <Mark.Witton@port.ac.uk>; <pterosaur.net@googlemail.com>; "dinosaur mailing list" <dinosaur@usc.edu>; "David Hone" <dwe_hone@yahoo.com>
Sent: Friday, January 15, 2010 11:23 AM
Subject: Re: was: Pterosaur.net now: pteroid


Remember the rest of the wing is creating drag that is trying to
overextend the elbow. That is a constant force while flying.