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From: wmartin@brl-tgr.ARPA (Will Martin )
Newsgroups: net.aviation
Subject: Acrobatics
Message-ID: <11624@brl-tgr.ARPA>
Date: Tue, 16-Jul-85 15:15:55 EDT
Article-I.D.: brl-tgr.11624
Posted: Tue Jul 16 15:15:55 1985
Date-Received: Sat, 20-Jul-85 04:40:18 EDT
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Reply-To: wmartin@brl-bmd.UUCP
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Organization: USAMC ALMSA
Lines: 21

Regarding the "slow four-point roll" mentioned about the 707 -- this
started me thinking in general terms about acrobatics. I'm sure this is
obvious to those of you out there who have really studied aviation, but
I have some novice questions:

1) On the stages in a slow roll, where you hold the positions for some
period of time, and where you are on your side: what is holding the
airplane up? Momentum? Faith? (The wings are vertical at those times.)

2) We have seen diagrams and descriptions of wing cross-sections and
airfoils in basic physics classes, describing the differential airflow
over the top and bottom, and how this creates lift. OK; so how does a
plane fly inverted? Is it just by holding enough of an angle of attack
that you get some lift from the inverted airfoil? 

Thanks for basic knowledge!

Regards,
Will Martin

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