Message-ID: <008401c000b3$8d0d9f00$0464a8c0@station4>
From: "John Barrett" <2thman@olympus.net>
To: "Lancair Mail List" <lancair.list@olsusa.com>
Subject: Rd: AOA
Date: Mon, 7 Aug 2000 13:41:30 -0700
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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I can vouch for the AOA instrument - it's a great idea.  I flew fighters in
the US Navy - Vietnam era and it was certainly the best thing we had for
getting aboard the boat after the Fresnel lense meatball.  The indicator
consisted of a high and low chevron with a donut in the middle on the
instrument panel in the F8 and F9.  There was also an external visual
indicator on the landing gear that the LSO (Landing Signal Officer) could
observe as he advised you on your approach.  Interetstingly, the Sierra
Flight Systems EFIS 2000 has incorporatied a computed AOA bar and verbal
warning system that does most of the same things as the one we're talking
about in this thread.

You give up a little with the SFS angle of attack because, as I understand
it, there is no compensation for weight change and it rather gives you data
based on gross weight to be conservative.  However, it does a great job of
computing G forces, angle of bank, airspeed and so on.   In the Lancair IVP,
it has been demonstrated to be very accurate and corresponds directly in
flight with actual stalls just as it should.  It would be nice if you could
program it at the beginning of a flight for weight and have it compute
weight change as the system measures the fuel burn throughout the flight.
 I suspect our guys at SFS will program that into the software in the
future).

What you gain is an integrated instrument that you don't have to install,
pay extra for or find space for on your panel.  You improve your scan at
critical moments because your AOA is now right smack on the center of your
artificial horizon display instead of some other place.

If I didn't have the EFIS 2000 in my plane, I wouldn't consider completing
it without the AOA Marv speaks so positively of.  As it is, I'd be happy to
sell mine in the box at a VERY reasonable price.

Regards,
John Barrett - LIVP
CARBINGE- "The World Hinges on Us"
360 385 1000
http://www.olympus.net/personal/2thman/carbinge1.htm

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