Re: pinhole Upside-down stunt planes

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Wed Nov 29 2000 - 15:05:04 PST 

Message-Id: <l0311071cb64b3ae191fd@[192.174.2.173]>
Date: Wed, 29 Nov 2000 15:05:04 -0800
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Upside-down stunt planes

Hi Sidney

If you draw the airflow over an inverted wing which, by the way, as Al Sefl
points out must have an angle of attack. You will see that the streamlines
flowing above the inverted wing are compressed more than the streamlines
below the wing. This leads to greater acceleration of the air and lower
pressure above the wing and lift. Now is when I wish there were an easy way
tpo draw an image in an e-mail answer.

By the way, the Bernoulli effect does work in the open air.
The lift can be explained 100% by Bernoulli or 100% by Newton.

Here is a short yet correct statement of Bernoulli:
When the speed of air flow increases from one point to another the pressure
will decrease.
Notice that it is staement about the change in speed between two points and
the change in pressure between two points.

Paul "But it is more complicated than that!" Doherty,
Senior Staff Scientist, The Exploratorium.
pauld@exploratorium.edu, www.exo.net/~pauld

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