Flight manual DG-1000S
Issued: March 2002
LBA app.
4.16
4.5.4.4
Dumping of the waterballast
First open the fin tank, then open both wing ballast tanks together. Do not empty
one wing tank after the other to avoid an asymmetric loading condition.
Warning:
If the fin ballast dump valve handle can be operated with uncommon
low effort (force of the retaining spring is no more apparent) you must suspect
that the fin ballast can’t be dumped any more. In such case don’t dump the wing
ballast to avoid an unsafe backward C.G. position.
4.5.4.5
Valves leaking, servicing
Please refer to the maintenance manual sect. 1.8 and 4.1.
4.5.5
Flight at high altitude and at low temperatures
With temperatures below 0°C (32°F) for instance when wave flying or flying in
winter, it is possible that the control circuits could become stiffer. Special care
should be taken to ensure that there is no moisture on any section of the control
circuits to minimize the possibility of freeze up. It could be advantageous to
apply Vaseline along all the edges of the airbrake cover plates to minimize the
possibility of freezing closed.
Operate the controls regularly to prevent ice build-up.
It is not allowed to carry waterballast.
Caution:
1.
At temperatures below -20°C (-4°F) there is the risk of cracking the gelcoat.
2.
Attention must be paid to the fact that at higher altitudes the true airspeed is
greater than the indicated airspeed.
The max. speed V
NE
is reduced. See the following table:
Altitude in [m]
0-3000
4000
5000
6000
7000
8000
V
NE
indicated km/h
270
256
243
230
217
205
Altitude in [ft]
0-10000 13000 16000 20000 23000 26000
V
NE
indicated kts.
146
138
131
124
117
111
3.
Dump the water ballast before you reach freezing altitude or descend to
lower altitudes.
4.
Do not fly below 0°C (32°F) when your glider is wet (e.g. after rain).
Flight manual DG-1000S
Issued: March 2002
LBA app.
4.17
4.5.6
Flight in rain
With light rain the stall speed and the sink rate increases slightly and the
approach speed has to be increased.
4.5.7
Cloud flying
Cloud flying is only permitted without waterballast. Take care to fly smoothly
and coordinated. It is prohibited to use a spin as a method for loosing altitude in
cloud. In case of emergency, pull out the dive brakes fully before exceeding a
speed of 200 km/h and dive with max. 200 km/h (108 kts.) to leave the cloud.