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I second Theo Green's desire for a comparison of Lift Reserve's AOA and
Jim Frantz's unit.  If you're interested, The patent on the Lift Reserve
unit is 4559822 and makes some interesting reading.  It is available for
free from the USPO at:
http://164.195.100.11/netahtml/srchnum.htm
or from the IBM site at:
http://www.patents.ibm.com/patquery.html
The IBM site works great with your web browser, but to get images to
print properly, you have to save the images, then open and print them
with a program like Lview.  On the other hand, the USPO site requires
you to get the special TIFF viewer browser helper app (per instructions
elsewhere on their site) and install it in the browser (and in my case
disabling Quicktime's attempt to keep re-installing itself over this
app.  But once installed, the image resolution is better and you can
print direct from the browser (Netscape in my case.)

Furthermore, many years ago, probably 15 or more, Sport Aviation had an
article on AOA and making your own using an airspeed (differential air
pressure) instrument for the readout.  I had the idea in the back of my
mind to use a Dwyer Instruments gauge.  They have many low pressure,
compact gauges.   I have that article stashed somewhere -- I just don't
know where.  (The problem with being a pack rat, you always have it, you
just don't know where it is!)

Charles R. Patton
N360JM

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.