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

[jrc <jrccea@bellsouth.net>]

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.