Rev #37
Version 8.0
April 2021
Page 48 of 121
If the TE pitot tube has been connected
TE compensation should be set to 0%.
No further adjustment of the TE compensation is possible. Quality of the TE tube
is the one and only factor.
For
electronic
TE compensation, connect the TE port to
static
. Set the Vario
Param TE compensation
initially
to 100% and then adjust this with flight testing
as described below.
5.7.3.9.1 TE Fine-Tuning
The electronic TE compensation can be fine-tuned during flight using the following
procedure: It is essential that this is only performed in smooth air; it is not possible to tune
the TE accurately in turbulent air.
• Set TE compensation to 100%.
• Accelerate up to approximately 160 km/h (75 kts) and keep the speed stable for a few
seconds.
• Gently reduce the speed to 80 km/h (45 kts).
• Observe the vario indicator during the manoeuvre. At 160 km/h the vario will indicate
about -2 m/s (-4 kts). During the speed reduction the vario should move towards zero
and should never exceed zero.
• If the vario shows a climb the compensation is too low; increase the TE% and vice versa.
• Try another "zoom" to assess the change and make further adjustments if necessary.
Electronic TE compensation is only effective when the Pitot tube and static sources are co-
located and the pneumatic lines to the instrument are approximately the same length. The
best sensor to use is the combined pitot/static Prandtl tube. If problems are experienced
with the electronic TE compensation the most likely cause is the glider’s static source.
The static source can be checked by plumbing the pneumatic tubes for electronic
compensation and then setting the TE: to 0%. In still air accelerate to approximately
160 km/h (75kts) and slowly reduce the speed to 80km/h (45kts). Observe the vario
indicator. If the static source is good the vario should immediately start to move to show a
climb. If the needle initially shows increased sink and then moves to a climb, the static
source of the glider is unsuitable and there is no way to provide successful TE compensation
electronically. The use of a dedicated and accurate fin-mounted pitot/static source such as a
Prandtl tube might help.
5.7.3.10 Vario Average Time
Vario average time defines the integration period for the average netto vario in seconds.
The default is 20 seconds.
5.7.3.11 Integrator Reset
If this item is enabled the average vario (integrator) will be reset to 0 when switching from
SC to Vario mode.
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