Most of these data are approximations based on 2nd-order fits of glider polars. I have adapted the JavaScript code now to allow for infinite-order fits in any units. So if you have some data, please E-mail me. Contributions welcome and noted with a (*). Actual polar data will differ. Calculated and actual polar curves of many of these gliders are available.
*Credits
2nd-order fits: Manfred Burkert via Rich Carr of the Colorado Soaring Association.
2nd-order Discus: Carlos Gómez-Mira
2nd-order PW-5: J. Stingl
2nd-order Schweizer 1-26C: Brian Case
IS-28B2 Lark Polar Data: Paul Lynch
LS-4a Polar Data: Gary Ehrenfeld
Schweizer 1-35 Polar Data: Tom Rent
Schweizer 2-33 Polar Data: Mark Boyd
Xtreme Polar Data: Russ Hustead