AOA system

[JTD]

Question for Dynon techies,  Is bank angle and or G meters sensors used to determine AOA. Was wondering how load factor is obtained.  Thinking about accelerated stalls [ch128556]

 

[dynonsupport]

An actual AoA sensor is used. Dynon's AoA is directly measured, not derived from other data.

 

[JTD]

my question ( or complete misunderstanding ) is that stall speed decreases in a turn that exceeds 1G If all calibration is done in wings level stall ( not accelerated ) how is system accurate in a Higher G turn?

 

[gtae07]

my question ( or complete misunderstanding ) is that stall speed decreases in a turn that exceeds 1G  If all calibration is done in wings level stall ( not accelerated ) how is system accurate in a Higher G turn?

AOA is independent of bank angle (or airspeed, or pitch angle, or gross weight, or phase of the moon). An airplane stalls when it exceeds the critical angle of attack. Period. If you stall at a given AOA in level flight, you will stall at that AOA in a turn or pull up.

Since the Dynon system (and other true AOA systems) measure actual angle of attack, they are accurate regardless of airspeed, bank angle, load factor, gross weight, etc. That's why there's been a push lately to install and use them--they're basically always accurate and you don't have to worry about approximations like bank angle, load factor, gross weight, etc.

I can be in an 80 degree bank at 40 kt and not be stalled. I can be wings level at 180kt and stall. All that matters is AOA.

 

[Dynon]

Put another way. You only need to know airspeed, bank angles, load factors when you don't have a way to measure AOA directly. All of those other things are rules of thumb and calculations that help you figure out AOA. But when you actually know AOA, none of those other things matter, although they help to internalize how different maneuvers and conditions affect AOA.