Flytec 5030 v2.24 * - Manual (Page 46)

Flytec
5030 GPS
resulted in another vario indication and necessitated another correction.
With the Flytec 5030 GPS, as with the 5000 instrument series, we are entering a new area
for distance optimized Speed to Fly. The pilot does not need to touch the unit to change the
McCready ring value (that is the average thermal climb); but this value will be shown to
him/her as an active McCready indicator, displayed as a single arrow in the climb range of
the vario scale. The 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. How much the value
changes, depends first of all on the polar curve. The pilot has to adjust his/her speed in such
a way that the indicator always stays above the value of the average climb. As the
McCready indicator cannot only be seen, but also its value is conveyed acoustically by
means of a variable tone (pulse/pause=1:4), the pilot does not need to watch the indicator
continuously, but can react to vario changes of the McCready indicator immediately by
adjusting his/her speed to the changing tone.
In order to offer the pilot additional help it is possible to set an acoustic dead band around
the chosen McCready ring value (this is that position of the McCrdy pointer when the user is
activating the McCrdy sound by pressing the key McCr /Mark ) This means, the pilot flies
correct according the McCrdy theory when the instrument is quiet. In the Setup menu Basic
Settings/McCready one can adjust the wideness of this dead band. (Factory setting = + - 30
cm/s)
.
A Case from Experience:
0 Bat. 3.57V 12h
4
3 2
1
m/s
1
2 3
4
70
50
40
30
m
60
Examples of the polar curve from 5.4
The pilot flies with the best glide in
calm air. The indicator for required
speed corresponds to the flight
speed. The McCready indicator is on
0. The average climb in the thermal
was previously at 1.3m/sec
0 Bat. 3.57V 12h
4
3 2
A pilot is crossing a valley at a relatively high speed. Due to a lot of sinking air, the danger
exists that he/she may not be able to get over the ridge on the other side of the valley. So
that the least amount of height is lost from this point on, he/she will reduce his/her speed
until the McCready indicator is on zero. (This is the speed of the best glide too) And on the
analogue speed scale of the Flytec 5030 GPS, the indicator for best glide will correspond
with the actual present speed. (See picture last page on the right )
If the pilot were to reduce his/her speed even further, the McCready indicator would run into
the negative number range. This is a flight condition which must be avoided, because the
pilot loses both time and altitude unnecessarily.
The Flytec 5030 GPS warns acoustically by a deep tone with rapid intervals, if this flight
condition occurs. This happens mostly when a pilot flies in the area of “Best glide” and then
ends up in sinking air. In this case he/she has to act very quickly.
Since every longer flight consists more or less of a sequence of thermalling up and gliding
away, it is basically unimportant whether the gliding speed conforms with the expected climb
1
m/s
1
2 3
4
70
50
40
30
60
m
Examples of the polar curve from 5.4
hang glider. The McCready indicator
with 2m/sec average climb rate
corresponds to a flight speed of
63km/h; it is concordant with the
indicator for the average thermal
climb rate. The speed of the best
glide would be 50 km/h here.
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