On 2011/11/22 22:06, Alexander Swagemakers <alexswagemak...@gmx.de> wrote:
> I?m sure these calculations are technically correct but from a practical
> point of view this is madness!

It is not XCSoar's priority to please the user with intuitive and
expected calculation results; the first priority is to display correct
results.

What you found here is an interesting corner case indeed.  Increasing
MacCready will reduce the amount of height that needs to be circled to
reach the target, because less time will be spent in thermals, and
thus less wind drift will be experienced.

The glide bar disappears because a solution is impossible within this
MacCready range.  Wind drift will be bigger than height gain while
circling.

Max

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