FLIGHT DESIGN EXXTACY Repair And Tuning Manual page 18

Pitch Pressure
Flex wing pilots new to the Exxtacy will notice a dramatic decrease in pitch forces. Pitch pressure is a function of many factors, but mainly it
comes from the twist of the wing. The twist in an Exxtacy is determined by the construction of the outer four ribs and, for all but the seventh rib, is
fixed at the factory. Rib seven can be adjusted using washers, and generally needs to be a few millimeters higher than rib six, when sighting along
the trailing edge.
The second factor that determines pitch pressure is the wing sweep. This is adjusted by the setting the black straps at the trailing edge of the sail.
The sweep must be measured to conform within the allowed specifications determined when the wing was certified by DHV.
You measure the wing sweep by placing a set of marks on the rear of the keel. Measure from the back of the bottom keel attachment plate, at the
nose. Place a mark 2525 mm back on the keel. Place two more lines 15 mm, forward, and backwards of this line.
Stretch a long string, at the end of each wingtip, at the trailing edge of the sail, and pull it taught..
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