I have measured the performance of six gliders: The Laminar ST 14, the Laminar 14, the WW Fusion 155, the WW XC 155, the Exxtacy 160, and the ATOS 145.
You can download the polars for each of the gliders by clicking of each of the files listed below. Each file is a separate Excel for Windows 95 file (the ATOS is in Excel 97 or 2000 format).
I flew all of the gliders, used the same Ball Graphics Comp to take all of the readings, and placed the vario in the same location. All polar flights were taken at around 7 AM (sun time) on calm days at Wallaby Ranch. Because I took all these polars the differences that one could attribute to different pilots is removed.
Of course, the number of polars is quite small, and they don't tell us with much statistical validity what the actual values for the given glider/pilot combination are. The values created by the Ball Graphics Comp are an average of all the values during a given flight for a given speed. If a speed is held for three seconds a new value of the sink rate is averaged in with the preceding values.
In spite of the fact that I don't have a great deal of data here, I have published what I have in an effort to encourage others. Manufacturers' have no desire to see this data out there and therefore never publish what they have. The only way we are going to get more data is to publish what we have and encourage others to do likewise.
See further discussion at More on Polars
If you have further questions regarding this data you can contact me at: davis@davisstraub.com