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From: tel@cbnap.UUCP (T. E. Lester x3259 3E257)
Newsgroups: net.aviation
Subject: Re: Acrobatics
Message-ID: <21@cbnap.UUCP>
Date: Sun, 21-Jul-85 10:42:13 EDT
Article-I.D.: cbnap.21
Posted: Sun Jul 21 10:42:13 1985
Date-Received: Wed, 24-Jul-85 21:24:15 EDT
References: <740@infopro.UUCP> <11624@brl-tgr.ARPA>
Reply-To: tel@cbnap.UUCP (T. E. Lester x3259 3E257)
Distribution: net
Organization: AT&T Bell Laboratories, Columbus
Lines: 19
Keywords: Aerobactics

In article <11624@brl-tgr.ARPA> wmartin@brl-bmd.UUCP writes:
>
>1) On the stages in a slow roll, ...what is holding the airplane up?...
>
On wing edge the plane must assume a nose high attitude. The combination
of down thrust from the engine and wing effect from the fuselage side
give the lift. This requires a rather high speed.

>2) ....describing the differential airflow... how this creates lift. 
>OK; so how does a plane fly inverted? ...
>Will Martin
>
>USENET: seismo!brl-bmd!wmartin     or   ARPA/MILNET: wmartin@almsa-1.ARPA
Common misconception, differential airflow causes lift. Basic laws of
physics will tell you "action = reaction" Lift is caused by the acceleration 
of a mass of air downward, period. The airfoil is just an efficient way
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.
		Tom ihnp4!cbnap!tel