FES Flight Manual, v1.18 May 2020
Page 10 of 35
2.4.3 Battery packs
FES needs two battery packs wired in serial. Each battery pack has 14 cells. In total,
the system has 28 cells.
Note: You can find more details about the battery packs which are used on
a specific type of FES powered sailplane in the separate FES Battery pack
manual.
2.5 Power-plant instrument markings
FES power-plant has a dedicated FCU instrument with a high-resolution sunlight-
visible colour display mounted on the instrument panel.
Note: You can find more data about the FCU and its operation in the
separate FES FCU Instrument manual.
2.6 Weight
FES system can be installed only on sailplanes with enough margin in the maximum
weight of non-lifting parts. Total weight of all FES components, including battery
compartment reinforcement ribs, is about 50kg. However, the system requires one 12V
battery as a buffer – usually, the tail battery remains. Other 12V batteries are removed to
save some weight (two standard 12V-7Ah Pb batteries weigh approximately 5kg).
Exact FES system weight depends on the type of sailplane and installed FES
components.
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