On Tuesday, January 21, 2014 7:14:33 PM UTC-5, son_of_flubber wrote:
Get a high tow into still air...

The likelihood of measuring meaningful data yourself is ZERO.
Johnson published measurements are in some cases badly off,
as the CG was not controlled during testing, and the datapoints
and reduction inadequate. It is REALLY HARD to do this properly
and only Idaflieg (?sp) measurements are generally useful.

Choose a similar polar and dial in a few bugs until final
glides generally match...

Hope that helps,
Best Regards, Dave