Schempp-Hirth Ventus-3M Performance, Предварительное руководство по эксплуатации самолета

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SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3M „Performance“ FLIGHT MANUAL
March 2019 CS 22
Revision – 4.5.9.2
4.5.9 Flight with water ballast (cont.)
Filling the water tanks
The tanks must be filled only in rigged condition and dumped prior to de-rigging.
Warning:
The water ballast load in the left and right wings must always be the
same so that the lateral stability is not adversely affected.
Each tank features a round opening in the upper wing surface near its outside end.
Since the inner and outer tanks of a wing are connected, these tanks can either be
filled individually via their own filling openings or together via the filling openings of
the outer tanks.
Filling the water ballast through the filling opening of the outer tank is slower than
filling the inner and outer tanks individually, as the flow through the separation
point between the inner and outer tanks is reduced.
When filling the tanks it must be ensured that the maximum water ballast is not
exceeded - see 6.2.2 and 6.2.3.
Dumping the water ballast
The operating handle for dumping the water ballast is located on the right-hand
side of the cockpit. It is guided in a slide. In the front position, all dump valves are
closed. In the rear position all tanks including the fin tank (optional) are emptied.
The inner and outer wing tanks are emptied together via the dump valve of the
inner tank.
The dumping time in flight at approx. 120 km/h (65 kt, 65 mph) with full tanks for
inner and outer tanks is approx. 12 minutes 30 seconds.
When the inner and outer wing tanks are full, the discharge quantities from these
tanks are approximately as follows:
After 30 seconds ca. 50 litres (13 gallons)
After 120 seconds ca. 90 litres. (24 gallons)