For those interested, there is a good basic aerodynamics section on AOA in
John Denkers online book (Graham and Mike can obviously write their own
books !):
http://www.av8n.com/how/htm/aoa.html#toc20
Advanced Flight Systems (Angle-of- Attack.com) make an AOA system that
derives AOA from the pressure differences between 2 tiny pressure ports on
the top and bottom surface of the wing, and the static and pitot pressures -
no additional probes. It is much easier to install before the wings are
closed, but they claim it can be installed in a completed aircraft.
I have installed this but am not yet flying, so can't comment on its
accuracy, but I believe it is supposed to be quite good - I would appreciate
comments from anyone who has used it or knows how it performs.
Keith Hickling,
New Zealand.
95% done, much less than 95% to go!
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