Flytec 6030 * - Manual (Page 57)

Flytec 6030-GPS
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and is flying towards his goal. He should speed up until the pre-calculated altitude above
goal is at 0 again. His McCready indicator should be in the range of 2 m/s (in our example,
he is flying at around 62 km/h). He could even overcome a zone of sinking air, but will have
to fly afterwards with a smaller McCready ring value. On no account the McCready indicator
should be allowed to run below 0. This means that with good lift in a thermal, before the
departure to goal, there are certain altitude reserves because of the higher speed.
If the average lift is only slight, then the instrument calculates with a speed being just a little
more than the speed for best glide. There are practically no altitude reserves and a small
area of sink could force the pilot to land before reaching goal. Therefore one should increase
the safety altitude by “tanking up” before leaving the thermal
For all previously made considerations we assumed that the wind component is automatically
calculated from the difference:
Gndspeed – Airspeed. However, there are good reasons which
justify to overwrite this automatically logged Spd-Diff with a manually entered value.
1. While circling up in thermals the wind prevailing outside of the thermal shall always
be stronger than the measured one. The strength is dependent on the value of climb
and also on the fact if the pilot is at the top or at the bottom of the thermal.
2. As for the final approach, also slight wind fluctuations, for ex. induced by yaw will
take effect on the pre-calculated arrival altitude. A wind component logged as fixed
value shall then calm the result.
3. When the pilot in down glide from high altitude knows by experience, in which way
the wind shall change in the lower layers, he can consider this already in advance.
4. When paraglider pilots fly without Speed sensor, the manually logged wind
component can provide a significant improvement of final glide calculation.