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From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.aviation
Subject: Re: Acrobatics (Really How Things Fly)
Message-ID: <171@brl-tgr.ARPA>
Date: Thu, 25-Jul-85 12:31:34 EDT
Article-I.D.: brl-tgr.171
Posted: Thu Jul 25 12:31:34 1985
Date-Received: Sat, 27-Jul-85 01:13:59 EDT
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Organization: Ballistic Research Lab
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> >of doing this. A lot of aerobatic planes have symetrical wings with zero
> >dihedral and get lift purely from angle of attack. Hope this helps.
First, dihedral is the angle of the wings to each other and have nothing
to do with the symetricallity of the wings.  They can be symetrical with
the dihedral being anything.

> 
> Sorry, lift is created by two factors; increased air velocity over the
> upper surface, and the so-called "action = reaction" lift.  The first
> factor accounts for (in normal aircraft) about 80% of the lift produced.
> 
More correctly, lift is caused because the increased velocity over the
upper surface causes a decrease in air pressure on the top comared with
the bottom.

-Ron