Polar Analysis from flight logs?

At 07:00 01 January 2005, Eric Greenwell wrote:
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.

50:1 is an angle of a degree and a bit so if you have
your 'straight ahead' and 'straight down' sensors canted
down/aft by just a degree from true horizontal/vertical,
you'll get a pretty accurate airspeed, but the 'vertical'
speed will likely show zero, I think, since it will
be reading off dust particles that have zero velocity
towards/away from the glider.

9B