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



Even with the larger radiused leading edges, an LEV can be established and shed aftward by an intitial sharp transverse translation of the leading edge. This will establish full circulation about the wing within about half a chord length of wing travel rather than the 2 chord lengths otherwise required.
JimC


----- Original Message ----- From: "Mike Habib" <habib@jhmi.edu>
To: <rmtakata@gmail.com>
Cc: "jrc" <jrccea@bellsouth.net>; <dinosaur@usc.edu>
Sent: Wednesday, June 25, 2008 1:02 PM
Subject: Re: Archie a non-flyer? (was:Re: origin of bats/reply 2 to TMK)



Leading edge vortices (LEVs) are actually known in several birds and bats now, as well. This is predictable, of course: we can expect LEV use in just about any flapping flyers with the proper leading edge shape that fly in the prerequisite Reynolds Number range. In fact, since most flying animals have a sharp leading edge, at least outboard, LEV usage is probably pretty ubiquitous, though it is presumably less pronounced in the larger birds and bats.