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Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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 Posted: Wed Feb 16, 2011 7:53 am Post subject: AOA: Re: AOA indicator |
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Attached is an AOA approach by by Jim Mantyla of Barrie Ont for the AirSoob
list.
I borrowed the idea for the AOA "pitot tube" with the angled holes. But,
instead of an analog pressure gauge calibrated for "Reserve Lift" - I put a
pressure sensor next to the probe.
I then processed and compared the dynamic pressure component provided by
each tube of the probe, I used a microprocessor to do this and provide a
display of both the calculated AOA value and a visual (graphical) indication
of the angle of attack with alarms that could be set.
I tested it on the bench with air flow and by varying the angle of attack
between wind flow and probe, it would indeed respond as expected. I had
initially intended to offer the unit for sale, but later decided that it
would probably not be economically viable as other units were avaliable and
the market for AOA was uncertain. I also question how many folks would want
to hang another "Pilot probe" under the wing.
It was a fun and educational project and I still have it for some future
time when things are slower and I find the time to hang it under the wing
and see how it works in the real world.
Too little time and too many projects {:>)
Ed
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
--------------------------------------------------
From: "user9253" <fran4sew(at)banyanol.com>
Sent: Wednesday, February 16, 2011 9:44 AM
To: <aeroelectric-list(at)matronics.com>
Subject: Re: AOA indicator
| Quote: |
<fran4sew(at)banyanol.com>
Bob,
I did a search of past EAA articles and found the following pertaining to
AOA:
Better Way to Fly - May 1998
Carrier Pilots' Secret - July 1999
Test Pilot: Angle of Attack - April 2001
Test Pilot: Angle of attack and lift/drag - May 2001
Test Pilot: Angle of Attack - November 2003
Shop Talk: Angle of Attack Indicator - December 2008
I could not find anything in 2005 about AOA. The December 2008 article by
Dave Barker might be the one that you are looking for. It describes how
to build the AOA sensor using a hall effect transducer and LED bar graph
display.
Here is a link to the December 2008 EAA article:
http://www.oshkosh365.org/saarchive/eaa_articles/2008_12_21.pdf
Below are links to the author's website. Dave Barker's pdf gives more
detailed construction details than the EAA magazine article.
http://www.barkeraircraft.com/files/AOA_rDisplay.pdf
http://www.barkeraircraft.com/AOA_kit.html
Although Dave Barker no longer sells AOA kits, he still has some circuit
boards available. There is a link to his email address on his website.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331206#331206
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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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nuckolls.bob(at)aeroelect
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| Posted: Wed Feb 16, 2011 9:30 am Post subject: AOA: Re: AOA indicator |
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|
At 10:43 AM 2/16/2011, you wrote:
| Quote: | Attached is an AOA approach by by Jim Mantyla of Barrie Ont for the
AirSoob list.
I borrowed the idea for the AOA "pitot tube" with the angled
holes. But, instead of an analog pressure gauge calibrated for
"Reserve Lift" - I put a pressure sensor next to the probe.
|
Great minds think alike . . . 
I fiddled with an identical configuration about ten
years ago. Looked at a molded two-port AOA mast with
electronics built right into the base of the mast
and driving a small analog instrument. Mount mast,
hook up 14v, install indicator and calibrate.
| Quote: | Market for AOA was uncertain. I also question how many folks would
want to hang another "Pilot probe" under the wing.
It was a fun and educational project and I still have it for some
future time when things are slower and I find the time to hang it
under the wing and see how it works in the real world.
Too little time and too many projects {:>)
|
You got that right. Never got a chance to fly the
poc item but I did "fly it" on the roof of my
car. But aside from packaging, I had nothing
particularly unique from other products on the
market . . . and the "lift reserve" approach with
mast, two tubes and a Magnehelic gage was pretty
simple . . . tough competition.
Bob . . .
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