Flytec 6030 * - Manual (Page 14)

Flytec 6030-GPS
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2.3 Speed
Apart from Vario and altitude the flight through the air (= airspeed) is indeed one of the
decisive messages. By use of a precisely indicating speedometer it is not only possible to
increase air safety, but also to enhance the efficiency on long range flights.
On non-motor driven gliders the speed to fly and the McCready theory, as well as the Netto
Vario may only be operated correctly, if the precise flight speed through the air is made
known.
Due to the fact that the average flight speed of hang gliders and fixed-wing aircraft has been
increased over the past years, the service life of the utilised vane wheel speed sensors was
decreasing to the same extent. Double speed signifies 8-times wear out of the sensor.
2.3.1 Vane wheel und dynamic air speed sensor
For this reason the FLYTEC 6030 GPS is provided with two independent speed sensor
connections.
1. For paragliders the wind wheel sensor is maintained. Advantage: it displays the true
flight speed through the air and starts correct measuring above 1 km/h, it is also
very convenient for determination of the wind strength at take-off.
2. For hang glider pilots there is a dynamic air speed (pitot tube) connection which is
suitable to display speed data up to 300 km/h, it starts display only from 20 km/h.
If required, the pitot tube may be lengthened by use of flexible hose and be
positioned on a turbulence-free spot of the glider.
In particular the pilots of rigid-wing aircraft will appreciate in regard to flight safety
that on the analogue speed scale the gap of current speed to Stall speed is very
clearly perceptible.
There are correction factors dedicated for both speed connections. The factory setting is
always 100% for each of them. Basic Settings / Airspeed correct vane or ..pitot, within this
setting the Pitot-Sensor may be completely switched-off.
Depending on flight speed resp. of approach angle it is possible to measure differences of
airstream between the wing top side and wing lower side. Above top side the airstream
always higher, at lower side it is more slowly. This difference is also called rotation stream.
It is the reason why the speedometer displays during slow flights too little speed and during
fast flights too much speed.
In order to compensate for this fault, it is possible to set under Airspeed Offset an offset
of several km/h. It is highly recommended in any case to re-determine the correction factor
afterwards by realising a measuring flight.
The wind vane sensor measures the true air speed (=TAS).
The dynamic air speed sensor however measures the indicated air speed (=IAS).
In case you do not know the difference between these two terms, then please read
article 9.2 of the appendix.
Speed readings are analogue, as well as digital. The user may select in Setup-Menu Basic
Settings / Speed mode, if he prefers to read as True or as Indicated Air Speed. Regardless
of which sensor is used, on the FLYTEC 6030 GPS always both speed readings are present.
In the same Menu item paraglider pilots may set a display range being lower by 10 km/h
on the analogue scale 20 … 60 km/h. (Factory setting here is 30 … 90 km/h).