Flytec 6030 * - Manual (Page 54)

Flytec 6030-GPS
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Because of the fact that the FLYTEC 6030 GPS knows all the parameters during the
thermalling,
it can give the all clear message to the pilot in order for him to leave the thermal now and to
reach the selected goal as fast as possible. Hereby the instrument works on the following
presumptions: on the glide path to goal rising and sinking air neutralise each other and the
wind remains constant. As these conditions do not always exist, it is also dependent on
experience and care by the pilot to climb to safety height above the glide path before leaving
the thermal. This safety distance is continuously recalculated as pre-determined altitude
above goal or the glide path, and is actually displayed. McCready also discovered that,
exactly as with speed to fly, the speed of the best glide depends on the sinking of
surrounding air mass. The same flight speed can also be used for the fastest possible arrival
at goal, if one takes the average lift in a thermal instead of the sinking air mass. In other
words: if the average climb in the last thermal is 2 m/s, the pilot who will reach goal as the
first one is the pilot who circles up high enough that his speed to fly, corresponding to a
sinking air mass of also 2 m/s, can be flown unchanged to the goal.
With mechanical Vario meters manufactured in earlier times, pilots constructed a ring which
was arranged to swivel around the circular Vario scale. In the centre of this McCready-Ring
a thick arrow was positioned opposite to the Vario zero point. (This is the ring position for
best glide). In the lower part of the ring were the speed to fly recommendations (in km/h).
For utilisation the pilot first had to turn the ring so that the arrow was opposite to the
average climb mark on the Vario scale. Next he could read the recommended speed behind the
current Vario indication. Then he corrected his flight speed following this recommendation,
which of course resulted in another Vario Indication and necessitated a new correction.
With the FLYTEC 6030 GPS we are entering a new area fort he travel optimised speed to fly.
The pilot does not need to touch the instrument to change the McCready-Ring value (this
is the average thermal climb), but this value shall be shown to him as an active McCready
arrow on the outer edge of the Vario scale. This indicator goes up when the pilot speeds up
or has less sink; the indicator goes down when the pilot meets stronger sink or flies slower.
The fact of how much this value will change, depends first of all on the polar curve.
The pilot has to adjust his speed in such a way that the indicator is always positioned above
the value of the average climb. As the McCready arrow is not only optically visible, but its
value is also conveyed acoustically by means of a variable tone (pulse/pause = 1:4), the
pilot does not need to observe the indicator non-stop, but can react immediately to Vario tone
changes of the McCready indicator by adjusting his speed to the also changing tone.
It is possible for the FLYTEC 6030 GPS to set an acoustic dead band with adjustable range
around any required McCready ring value. For instance, to fly with 2 m McCready ring value,
one has to speed up until the McCready arrow is positioned on 2 m/s. Now by pressing the
McC; /WP
key the McCready acoustics are activated. In the range around 2 m McCready ring
(+/- 30 cm/s) the instrument is quiet and the pilot flies correctly on track.
Best glide
start point
Optimised start
basing on
McCready
Speed of best glide
Speed basing on McCready higher than
speed of best glide