On Tuesday, November 22, 2011, Alexander Swagemakers wrote:
> I just set up a scenario in condor with my streak running xcsoar connected
> to experiment with the glide bar behavior. The setup is as follows:
>
> LS8, final Glide St. Croix to Puimoisson due north 10.2km distance with
> 50km/h headwind, 1352m MSL.
>
>
> Switching MC values in XCSoar gives following results.
>
>
> MC 0 = +11m above final glide
>
> MC 0.1 = +8m
>
> MC 0.2 = +3m
>
> MC 0.3 – 0.6 = no glide bar
>
> MC 0.7 = -596m (glide bar reappears)
>
> MC 0.8 = -266m
>
> MC 0.9 = -212m
>
> MC 1 = -195m
>
>
> I’m sure these calculations are technically correct but from a practical
> point of view this is madness!
Why?
0.0 - 0.2 Reachable by direct glide (no thermalling -> no drift while
thermalling).
0.3 - 0.6 You need to thermal to gain height but drift while thermalling
is too large due too slow height gain with big drift.
0.7 - Thermalling needed, the stronger the lift the shorter the time needed
to reach the required height -> reduced drift distance
That is exactly the kind of helpful assistance a traditional device does not
give
you. If you expect thermals <= 0.6 don't even try, you will landout. Fly with
speeds given for 0.0 - 0.2.
Andreas
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