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Old July 13th 16, 07:26 AM posted to rec.aviation.soaring
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Default Dick Johnson methodology for measuring glider performance

That is all well and good if you are in Europe, have connection to Akaflieg and want to spend a lot of money.
I did order the results for my Pilatus B4, and the cost was 10 euros. I do not call that "a lot of money" :-)