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

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Subject: RE: upside-down airplanes (was: [Leica] Optical Question)
From: "Ernest Nitka" <enitka@twcny.rr.com>
Date: Wed, 6 Mar 2002 14:17:58 -0500

Doug - many many thanks - I can now go onto other puzzles

ernie
- -----Original Message-----
From: owner-leica-users@mejac.palo-alto.ca.us
[mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Douglas
Herr
Sent: Wednesday, March 06, 2002 2:14 PM
To: leica-users@mejac.palo-alto.ca.us
Subject: RE: upside-down airplanes (was: [Leica] Optical Question)


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.


- --


Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com


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