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Operation Manual IQ Motor+
3.6
Flight optimisation
3.6.1
Groundspeed (speed over ground)
The GPS-Receiver calculates its new position once every second. Speed over Ground is
derived from the distance between these positions. It is possible to reach conclusions about
the wind's influence from the difference between flying speed (Airspeed) and the speed over
ground.
3.6.2
Head- Cross or Tailwind; the Wind component
During a flight to goal or in calculating a final glide, it is not really the absolute value of wind,
but the wind component, i.e. the difference between Groundspeed and Airspeed, which 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, however, it is negative, it contains at least a part of head wind and the glide ratio over
ground will decrease. The IQ Motor+ takes anyway into consideration this wind component
in the course during for calculating the final glide. The entire "windspeed" as well as the speed
difference of the course „Diff.Speed" can be displayed as user field readout.
If the windsock indicating the wind direction covers the wind symbols N E W S, then for
reasons of clarity the corresponding letter below shall disappear!
3.6.3
Winddirection and Windforce
It is very important to know the wind in direction and force,
especially in case of an out landing. The wind force
can be selected within the user defined fields.
For this purpose it is necessary to fly one or two complete
circles at similar speed as possibly can be done. Duration
time for one full circle should at least be 12 seconds,
some more time would be better.
Whilst circling, the IQ Motor+ 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 and wind strength is the result hereof.
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 should always be at the top.
N
E
S
W
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