7.8.3.2 Draining the tip tanks
Water can be dumped from the tip tanks by moving the dump valve
control in the full forward position.
Approximately 200 ml of water remains in the tank after dumping. This
water must be drained after flight. Draining can be done as follows:
• Remove the 18m outboard tip and subsequently remove the red
drain plug from the root. Lift the tip of wing panel with the leading
edge facing downwards and allow all the water to drain.
• If a drain plug is installed, removed while the glider is rigged to
drain the remaining water.
CAUTION: It is important to leave the dump valves, filler caps and
drain plug open during storage. This allows the tanks to
ventilate and reduce water absorption in the composite
structure. Long term exposure to internal moisture
results in undesired deformation of the wing profile.