Flytec 6030 * - Manual (Page 31)

Flytec 6030-GPS
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2.7 Flight Optimisation
2.7.1 Ground Speed -
(Speed over Ground)
The GPS-Receiver calculates its new position once every second. Speed over Ground is
derived from the distance between these positions. This value belongs to one of the most
important pieces of information at all, because only from the difference between Airspeed and
Speed over Ground it is possible to reach conclusions about the wind’s influence. Therefore the
Speed over Ground should also appear on all display screens of user selectable fields. With a
paraglider (without pitot pressure sensor tube) the calculated airspeed may be shown in a user
selectable field, if no wind vane sensor is plugged in.
The same applies if in the Basic-Settings/Airspeed correct pitot the function of the pitot
sensor has been deactivated. ( Use Sensor ? = No ) The calculated airspeed (Calc. Airspeed)
is the result of a vector operation of wind and ground speed.
For measuring the wind it is necessary to fly several circles.
2.7.2 Head-, Cross or Tailwind: the Wind component
During a goal flight or in calculating a final glide, it is not really the absolute value of wind,
the wind component, i.e. the difference between Ground speed and Air speed, that is
decisive. In most cases the wind does not blow directly from the front or from behind, but
somewhat from the side. If this wind component “Spd-Diff” (in the user defined fields) is
positive, then the pilot will fly with a tail wind and the glide ratio over the ground will improve.
If it is negative it contains at least a part of head wind and the glide ratio over ground will
decrease. The FLYTEC 6030 GPS takes the wind anyway into consideration during target
flight or when calculating the final glide.
In order to find the right correction angle when a strong cross wind is present, please refer to
the section 2.6.4.5: Goto – Function.
The calculated wind speed can be displayed in a user selectable field.
If the windsock indicating the wind direction covers the wind symbols N E S W, then for
reasons of clarity the corresponding letter below shall disappear!
2.7.3 Wind Direction and Wind Speed
It is very important to know the wind in direction and
strength, especially in case of an out landing. The wind
strength can be selected within the user defined fields.
For this purpose it is necessary to fly one or two complete
circles as steadily as possible. Whilst circling, the FLYTEC
6030 GPS determines the direction of least speed over
ground, and checks also synchronously if in opposite
direction there might be the fastest speed over ground.
The calculation of wind speed is the result of difference
between Airspeed and Groundspeed. Wind direction is shown in the compass rose
at the position from where the wind is blowing by a small windsock symbol. During the
landing approach this symbol must always be at the top.
2.7.4 Glide ratio ( = L/D ratio )
By definition, the glide ratio is calculated by taking the horizontal distance traveled and
dividing it by the height which was lost.