Altair Glide Computer and Navigation System Manuel d'utilisateur Page 85

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XCSoar User Manual
In this dialog page, the ‘Settings’ button opens the basic settings
dialog (e.g. to adjust the bugs/ballast).
The glide polar page of the analysis dialog shows the average total
energy sink rate at each speed achieved in flight, when connected
to a supported intelligent variometer (e.g. Vega). This facility al-
lows pilots to perform test flights in stable atmospheric conditions,
such as on calm days with no wind, and inspect the measured glide
polar. By comparing the measured glide polar with the model
glide polar, this enables investigation of whether the glider is being
flown optimally with respect to flap settings and also to investigate
the benefits of performance optimisation such as sealing control
surfaces etc.
Data is collected only when in cruise mode and at G loading be-
tween 0.9 and 1.1; so pilots performing test flights should attempt
to fly smoothly with wings level.
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