User Manual UX11
Note
The wind gradient must be taken into account when measuring the surface wind. For example, if the
measurement on the ground is 30 km/h (18.6 mph, 16.2 kn) it may be 45 km/h (28 mph, 24.3 kn) at an
altitude of 150 m.
Aerodynamic factors
The following phenomena may disrupt a flight:
• Thermals: occasionally violent updrafts, especially in higher ground (< 7.2 km/h (4.47 mph, 3.89
kn)).
• Dynamic winds: accelerations in wind due to terrain (< 7.2 km/h (4.47 mph, 3.89 kn) vertical
and < 45 km/h (28 mph, 24.3 kn) horizontal).
• Turbulence: unstable wind generated by an obstacle upwind (order of magnitude: presence of
turbulence over a distance five times the height of the obstacle).
Rain
Avoid using the aircraft in a damp environment (be careful with morning dew, for instance) or when
Operation limitations on page 21
). If the aircraft has been flown during rainy
weather, ensure it has dried out completely before performing a new flight.
Note
The aircraft must be stored in a dry environment.
Storm
Do not begin or continue a flight in the presence of a storm (Cb) within a radius of 15 km around the
flight area.
4.2.3
Obstacle clearances
When defining a flight, you must ensure that the mission area is clear of obstacles at the flight height
and the selected takeoff and landing locations.
When you arrive at the site, visually check the takeoff and landing locations to ensure that the selected
locations are free of obstacles.
Obstacle clearances for the different stages of a flight are shown below.
Takeoff
From the takeoff location to 50 m (164 ft) in the launch direction, the area must be free of obstacles
within 30° to the left and right of the launch direction.
0 m
50 m
280 m
30 °
30 °
“
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