FES Flight Manual, v1.18 May 2020
Page 30 of 35
6. Weight and balance
6.1 Introduction
The components of the FES elements should be arranged in such a way, that C.G.
position does not change considerably in comparison to the pure glider version of the
aircraft.
6.2 Weight and balance record and permitted payload-range
The same applies as for a pure glider version or a powered version of specific
sailplane type.
6.3 Weight of all non-lifting parts
The weight of non-lifting parts of the sailplane includes weight of the pilot, the
fuselage with rudder, horizontal stabilizer and elevator, the instruments and equipment
and the FES installation (everything except wings).
The manufacturer sets the maximum weight of non-lifting parts for a specific type of
the sailplane.
6.4 Maximum weight
Sailplane manufacturer sets the maximum approved take-off and landing weight.
Warning:
Do not use the full amount of water ballast, because the FES
system already adds around 50kg to the take-off weight.
Adjust the amount of water ballast, so that you do not exceed the maximum
take-off weight. Overloading your sailplane will result in structural damage of
the airframe.
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