Archived posting to the Leica Users Group, 2002/03/06

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Subject: Re: upside-down airplanes (was: [Leica] Optical Question)
From: Javier Perez <summarex@yahoo.com>
Date: Wed, 06 Mar 2002 16:11:42 +0000
References: <B8ABC1E5.1ABDA%jbcollier@powersurfr.com>

Are you talking about compression lift?

John Collier wrote:
> 
> Big jet airliners do not fly by creating a vacuum above their wings. Wings
> are giant air pumps forcing enormous quantities of air downward. There was
> an interesting article in Discover magazine on this very issue.
> 
> John Collier
> 
> > From: "Douglas Herr" <telyt@earthlink.net>
> >
> > Ernest Nitka wrote:
> >
> >> why is that airplanes can fly upside down - if
> >> flying upright caused a vacuum just above the wing
> >> creating lift then flying upside down should cause
> >> the wing to move down. This has bothered me for
> >> near on 2 decades.  I get bothered easily
> >>
> >> ernie
> >>
> >
> > The airplane's wing is designed to produce lift efficiently at it's normal
> > angle of attack but it can produce additional lift inefficiently by increasing
> > the angle of attack (until it stalls).  The upside-down airfoil relies on a
> > high angle of attack to produce lift but does so very inefficiently.
> >
> 
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In reply to: Message from John Collier <jbcollier@powersurfr.com> (Re: upside-down airplanes (was: [Leica] Optical Question))