02.04.2022 | V1.02
-22-
Installation / Operation Manual
anemoi
If the incoming NMEA data provide no GPS (e. g. when the aircraft is in a hangar, or when the NMEA
source has not fou
nd GPS after boot yet), GS and track are indicated as “
- -
”
. If GPS is available on the
ground, correct values for GS and track are displayed.
6.4
In-Flight operation
Based on ground speed and pitot pressure,
anemoi
switches to in-flight operation once a takeoff is
detected. The system is also capable of being booted in flight and can initiate or resume normal
operation immediately after boot during normal flight phases.
Use of data indicated by anemoi
Data and indications provided by
anemoi
are to be used only as an additional aid to situational
awareness in flight. Safety-critical decisions must never be made based on information provided by
anemoi
. The AHRS system must never be used to intentionally fly outside of VFR conditions and is to
be used exclusively as an additional aid to visual flight within legal visual flight conditions.
Data interpretation and reliability
The following examples show how
anemoi
can be used to improve situational awareness in different
soaring / flying conditions:
•
When approaching a ridge,
anemoi
wind indication can significantly improve the
pilot’s
judgement of the updraft / downdraft and turbulence conditions to be expected near the
terrain and help choose which ridge to fly to in search of an updraft. In mountainous
terrain with ridge lift or valley wind active, low phases and outlandings can be avoided in
many cases by having precise knowledge of the current wind conditions.
•
When soaring in thermals, the wind in low and medium altitudes usually has a bias
towards updraft cores. The difference between live and average wind can be used to
infer the direction in which stronger updraft / less sink may be expected.
•
During thermal circling and when flying in rotor conditions below mountain waves, the
wind speed always decreases close to the center of strong updrafts, where currents from
different directions are joined in one spot. This effect can be used to identify if the glider
is already in the center of the updraft (indicated by a clear minimum in wind speed) or
possibly not.
•
When observing the average wind over longer flight durations, trends can reveal changes
in the bigger picture of weather situations.
•
Immediately after takeoff, and in the pattern during landing approach, a quick glimpse of
the live wind vector provides valuable aid for pilots for safely planning anything from
simple standard approaches to complex takeoff abort scenarios.
