From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] wing pressure
To: lml
Date: Sun, 04 Feb 2007 20:08:08 -0500
Message-ID: <web-1811362@logan.com>
In-Reply-To: <00fe01c7489f$ab20c540$6400a8c0@RDTVAIO>
References: <00fe01c7489f$ab20c540$6400a8c0@RDTVAIO>
MIME-Version: 1.0
Content-Type: text/plain;charset="iso-8859-1";format="flowed"
Content-Transfer-Encoding: 8bit

Posted for "rtitsworth" <rtitsworth@mindspring.com>:

  I once had a student who had thought about this lift stuff a lot and then he
  finally observed/concluded the following.
  
  
  
  The outside air isn't really moving - that's a mental deception invoked by
  those who attempt to mimic lift with a wind tunnel.  Rather, in the real
  world, the wing is moving.  Thus, the stationary air just gets
  "hit/deflected" by the wing as it approaches/passes.  No "jets" of fluid, no
  "streamlines".  When you think about the really big picture, all of the air
  (eventually) just returns to it's original position/condition after the wing
  passes (i.e. there are no holes left, nor any net displacement of air
  molecules).  So over time, there is no net change to the air.   Thus, there
  can't really be any net action/reaction as applied by Newton.  Thus, lift
  doesn't really happen.  It's just "magic" based on a deal the Wrights made
  with the Devil.  Interestingly, the magic deal included some parameters such
  as L=1/2 r V^2 A Cl, where Cl is a function of AOA, in attempt to keep the
  deal a secret.
  
  
  
  Hmmmm.  After thinking for a moment I then asked him: "well then how does
  the air that is displaced by the wing at the eventual destination (when on
  the ramp) get back to the spot that was initially occupied by the wing
  before the flight started".
  
  
  
  He smiled and said: "Ah, you've got it, see it's magic"