"Dan, U.S. Air Force, retired" wrote in
news:w3xIf.1376$et.1235@dukeread12:

.Blueskies. wrote:
"Bill Daniels" bildan@comcast-dot-net wrote in message
...

"Dan, U.S. Air Force, retired" wrote in message
...


A couple of years ago Kitplanes had an article about and AOA
sytem that used 2 ports flush with the wing surface
near the wing tips. It's a simplified version of a system the
military has been using for decades. The military version uses a
conical probe sticking out of the side of the fuselage. There are
two sets of slots a few degrees part facing towards the front of the
airplane. These slots are ports that send air pressure to two
sensing chambers. Here's where they decided to get complicated: the
cone is then driven until the chamber measure equal pressure. The
cone's position is then transmitted to an indicator. Obviously the
system isn't for single engine tractor airplane. The 3.125"
indicator is a tad big for most homebuilts, but does contain
switches for stall warning and AOA indexer lights. It seems to me
some enterprising electronics genius should be able to design a
simple system that does all this in solid state.

Dan, U.S. Air Force, retired

I'd also like an electronic AOA indicator. There are several probes
that work on three pressure pickups like
(http://www.cgmasi.com/aviation/index.html). In sailplanes we can
just tape a couple of yarns of the side of the canopy and mark the
inside with grease pencil.

bildan



Here is an electronic version:
http://advanced-control-systems.com/AOA/aoa.htm

Two pickups; one on the top of the wing and one on the bottom...


That's the system I waas thinking of.


Dan, U.S. Air Force, retired

I plan on putting this one in my Sonex:

http://www.ch601.org/resources/aoa/aoa.htm

--
-- ET :-)

"A common mistake people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
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