DG-1000S - DG Flugzeugbau

Flight manual DG-1000S
4.5.4 Flight with water ballast
4.5.4.1 Wing tanks
Recommended ballast for smooth thermals:
rate of climb ballast
m/s fpm litres U.S. gallons
below 1,5 300 None
1,5 – 3 300-600 100 26
more than 3 600 max. ballast
Do not exceed the maximum gross weight when loading the water ballast. The
maximum quantity of water allowed is dependent on the empty weight and the
cockpit load (see section 6.8.5).
In flight the water drains at approx. 0.5 lt./sec. (1.1 lbs./sec).
4.5.4.2 Fin water ballast tank
For optimal thermalling performance and handling water ballast in the fin tank
should be used to compensate the forward movement of C.G. due to the mass of
the wing water ballast. Please refer to section 6.8.6.
Warning: It is prohibited to use the fin tank in icing conditions see sect. 2.15.
Warning: If there is the risk of freezing, dump all water before you reach
freezing altitude, latest at +2°C (36°F), or descend to lower altitudes.
If you suspect a tank is leaking, dump all water immediately.
Water ballast raises the approach speed, so it is recommended to dump the
waterballast before landing. Dump the ballast before an outlanding in any case.
4.5.4.3 Filling the waterballast
See sections 4.2.2 and 4.2.3. After filling level the wings and check if the dump
valves are tight. It is not allowed to fly with leaking watertanks as this may
result in an asymmetric loading condition.
Issued: March 2002 LBA app. 4.15