Posted for Jeff Peterson <jeffreyb.peterson@gmail.com>:

 If you are interested in homebuilt angle of attack systems
 you might want to read this thread on rec.aviation.homebuilt
 
 http://groups.google.com/group/rec.aviation.homebuilt/browse_thread/thread/bc8acb7472d0698e/dfc062e386e86a01?hl=en&lnk=gst&q=angle#dfc062e386e86a01
 
 I was surprise how many people are interested in the subject.
 
 before building your own it pays to look at the
 variety of commercially available system out there.
 Two that use differential pressure systems are
 
 Advanced Flight Systems and
 Alpha Systems.
 
 and several efis units now include some kind of AOA.
 
 I have not flown with any of these but have collected a few opinions:
 The audio beep output of the Alpha is very effective...gives continuous
 feedback during any high AOA operation, but with eyes outside.
 The Alpha LED display looks cheap and clumsy (my opinion).
 The AFS unit is cumbersome to set up in the cockpit and requires probes
 built in to the wing.
 The AFS Pro display looks quite nice but is also pretty large.
 
 
 
 I did breadboard my own design which has heartbeat audio feedback,
 and a smaller display that either of either these units. I plan to use the
 Dynon heated Pitot/AOA probe.
 My own work is not well enough along for me to
 post schematics. I will post, if I get it working well.
 
 Cheers,
 
 --
 Jeff Peterson
 LNC2 N273CK