Andy Blackburn wrote:

At 23:00 31 December 2004, Eric Greenwell wrote:

Since the concept is to measure speed through the airmass,
I don't think
inertial systems would help any, as they are referenced
to the aircraft,
not the air.


I menat an inertial platform for attitude, not velocity.
If you the sensor isn't pointing horizontally/vertically
or parallel/perpendicular to the flight path, you will
likely get confounded results.

I think the angle of attack range for an unflapped airfoil is about 10
degrees, which would suggest errors of 0 (at high speed, for example)
increasing to 1.5% at low speed (or vice versa - depends on where you
aim the sensor). This could be easily corrected using using the
airfoil's Cl vs AOA chart. For a flapped airfoil, the fuselage AOA range
is even smaller, and the errors could likely just be ignored.

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Eric Greenwell
Washington State
USA