FES Flight Manual, v1.18 May 2020
Page 25 of 35
4.5.13 Flight in the rain
Never fly through heavy rain and thunderstorms. If you encounter rain, close the
ventilation to prevent water from entering into the spinner. Before the flight, seal the
battery compartment with tape, to prevent water from entering.
Warning:
Avoid flying close to areas with lightning activity!
It is allowed to fly through light rain with the motor running. However, use lower
RPM settings, suitable for horizontal flight, to avoid damaging the propeller blades. Stop
the motor if the rain becomes stronger.
4.5.14 Aerobatics
Aerobatic manoeuvres are not permitted with an FES equipped sailplanes, unless it is not
explicitly allowed for a certain FES equipped type!