LML:

I have been tinkering with an AOA circuit. I posted the schematic here:

http://w1.lancair.net/pix/Angle-of-Attack-Circuit

The circuit has a few improvements over previous ones.
It uses bar graph mode with an all-green LED display.
As you raise the angle the green (good) bars disappear.
A glance tells you how much reserve (green) you have.

When the last green goes out the vy bright red lights  come on and the horn sounds.
This is the stall warning, (actually per-stall).

My thought is to use an angle-adjustable probe like that used by alpha systems, and set the angle
with the plane configured for landing...flaps down.

Then, on climb out, with less flaps, the stall warning triggers a bit early, I think. That seems OK to me.
On landing one is intentionally bleeding off speed and and a precise lift reserve indication is what you want.
On climbout, in our overpowered lanciars, one would rarely want to be anywhere close to stall.

So, for me, the KIS principle wins  the day and I think an offset based on flaps in not needed.

--
Jeff Peterson
Dept of Physics, CMU