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6. Problem solving
The table below provides answers to the most
frequently asked questions.
Problem
Cause
Remedy
No speed displayed:
"-.-"
The sensor cannot carry out the
self-calibration process due to
fluctuating airflow (wind).
Prevent airflow reaching the Prandtl tube
for the period of the automatic calibration,
e.g. using a cloth or your hand.
A speed of only 0.0 km/h is
displayed.
Prandtl tube or silicone tubes not
allowing air to pass through.
Check that silicone tubes are not kinked.
Check that the Prandtl tube is not soiled
or blocked.
The speed is displayed
incorrectly.
Silicone tubes connected or ins-
talled incorrectly.
Check that both silicone tubes are correct-
ly fitted.
After landing, the vario -
altimeter does not show a
height of exactly 0 m.
Weather conditions.
Since the vario operates by monitoring
ambient air pressure, slight variations are
normal, especially if weather conditions
are changeable (low / high pressure).
The vario tone output on
the transmitter does not
work.
Transmitter setting.
Check the transmitter settings for vario
tone output. Make sure the address for
the vario function (rate of climb / descent)
is correct.
The sensor is not detected
by MULTIPLEX Launcher.
Power supply not present.
Read the “Configuration” chapter. You
must connect a receiver battery using the
Y-lead as well as the sensor.
The stall warning is trigge-
red too late.
Physics:
Altitude - ambient pressure dimi-
nishes with altitude. Higher speed
is necessary in order to generate
sufficient lift.
The sensor automatically adjusts
the speed measurement to the cur-
rent altitude. The speed displayed
is therefore always correct.
For each 1000 m of height you expect the
model to reach, set an additional speed
reserve of +5% for the stall warning.
Example:
Your model is trimmed to fly at a height of
10 m above sea level. The stall speed is
45 km/hr.
When flying in mountains at a height of
1010 m above sea level the stall speed
rises to 47.25 km/hr
(45 km/hr = 100%)
(47.25 km/hr = 105%)
GB
