You can make a custom polar in XCSoar and use your own numbers.

On 4/16/2016 11:01 AM, xcnick wrote:
Casablanca is the best. A saying that keeps coming to mind as I do this is: Garbage in, garbage out. Another is measure with a micrometer and cut with an axe.

Who uses what polar?

From what I can tell xcsoar and seeyou are using the manufacturer and winpilot is using Carl Herold, which is closer to Johnson.

The book value at 100kts is 550 ft/min, Johnson shows 650. See my concern? I would like to bend xcsoar, seeyou and the cambridge away from the book values.

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Dan, 5J