Bearhawk Yahoo Forum has an angle of attack plans. I haven't a clue if it works, but start with some 6061-T6 rectange bar. 1/2" thick, 1" wide, and 6" long. Drill two holes down through the bar almost 5.9" deep, and intersect these holes - so one port faces forward, other faces down.... bar is mounted at a 45 degree angle coming off the wing. In theory the pressure differential will reflect angle of attack and reserve lift.
Biggest trick is getting a 5/32" drill almost 6" deep and centered (there is a trick to doing that with a gun drill, but a long fluted drill worked OK (1/16" drift)
Plans call for a analog differential gauge, but a simple pressure transducer will also work.
Just some fun machining while tack welding, waiting for cool down, tack weld....
