SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3M „Performance“
FLIGHT MANUAL
March 2019
CS 22
Revision –
4.5.9.5
4.5.9
Flight with water ballast (cont.)
Water ballast is dumped from the fin tank through an opening on the lower side of
the fuselage tail boom, in front of the rudder. The fin tank dump valve is
mechanically linked to the drive for the valves of the middle wing tank, so that the
middle and outboard wing tanks are always opened simultaneously with the fin
tank.
The time required to dump the ballast from a full fin tank is about 90 seconds,
therefor draining the fin tank always takes less time than emptying the middle and
outboard wing tanks.
Caution:
o
Before the wing water tanks are filled, it must be checked (with dump valves
opened) that both drain plugs open up equally. Leaking (dripping) valves are
avoided by cleaning and greasing the plugs and their seats (with valves
opened). With closed dumping lever in the cockpit the valves must close fully.
Leaking (dripping) valves are avoided thereafter, with valves closed, pulling the
drain plugs home with the threaded tool used to attach the tailplane.
o
There is little point in loading much water ballast if the average rate of climb
expected does not exceed 1.0 m/s (197 fpm). The same applies to flights in
narrow thermals requiring steep angles of bank.
o
If possible all water ballast is to be dumped before conducting an off field
landing.
Warning:
While flying for longer time at air temperatures near 0° C (32° F),
water ballast must be dumped in any case when reaching a
temperature of 2° C (36° F). Thus avoiding freezing of the dump
valves and possible structural damage of the aircraft parts.
Never pressurize the tanks for instance by filling them directly from a
water hose and always pour in clear water only.
On no account whatsoever must the aircraft ever be parked with full
ballast tanks if there is the danger of them freezing up. The parking
period with full tanks should not exceed several days. For parking all
water ballast is to be completely drained off with filler caps removed
to allow the tanks to dry out.
When using the fin tank, check that those spill holes not being taped
closed are clear.
Содержание Ventus-3M Performance
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