ASW27B polar

[Chip Fitzpatrick]

Hi,

Does anyone have an ASW27B polar from flight test data or a set of
polar equation values they find useful?

Chip F

[Andy Blackburn]

Based on these three polar points take off the factory
polar:
V(knots) Sink (knots)
58.75 -1.24
84.45 -2.29
114.00 -4.86

I generated the following polar coeffieients:
a: -0.000832266
b: 0.078337385
c: -2.973814609

For use in the quadratic polar approximation:

Sink = aV^2+bV+c

All units are knots. This is based on a takeoff weight
of 760 lbs (wing loading of 7.84 lbs/sf). To adjust
for different wing loadings, divide the 'a' coefficient
by the square root of the wing loading ratio and multiply
the 'c' coefficient by the square root of the wing
loading ratio.

These are the same polar points used by WinPilot. I've
found it to be pretty accurate on long final glides.

9B

At 15:48 29 February 2004, Chip Fitzpatrick wrote:
>Hi,
>
>Does anyone have an ASW27B polar from flight test data
>or a set of
>polar equation values they find useful?
>
>Chip F
>

[Chip Fitzpatrick]

Thanks a lot!

Chip