Schempp-Hirth Flugzeugbau Ventus-3T Sport, Руководство по эксплуатации самолета, Страница: 96 / 177

SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3T „Sport“ FLIGHT MANUAL
April 2018 CS 22
Revision – 4.5.7.4
Water ballast fin tank (optional)
For optimum performance in circling flight, the forward travel of the center of gravity,
caused by water ballast in the wing nose, may be compensated by carrying water
ballast in the fin tank.
The water ballast tank is an integral compartment in the fin with a capacity of 7.8
kg/Liter (2.06 US Gal., 1.72 IMP Gal.). The fin tank has for every Liter including the
maximum capacity of 7.8 kg/Liter (2.06 US Gal., 1.72 IMP Gal.) spill holes, all properly
marked, on the right hand side of the fin, which indicate the water level – see
accompanying sketch. These spill holes are necessary for the indication of the water
ballast level and are needed for venting. Also with completely filled tank the uppermost
spill hole 7.8 kg/Liter (2.06 US Gal., 1.72 IMP Gal.) always must be open.
The ballast quantity to be filled depends on the water load in the wing tanks – see
loading table on section 6.2.5.
Filling is done with rigged or de-rigged horizontal tailplane as follows:
o
Before filling the tank, always tape closed one hole less than the load required,
measured in kg/Liter.
Example:
If a fin ballast load of 3.0 kg /Liter (0.79 US Gal., 0.66 IMP Gal.) is required, only the
lower two holes (1 and 2) are taped closed.
Any excessive water then escapes through the third spill hole, thus preventing any
overloading.
o
Set elevator trim fully back. Only necessary in case horizontal tailplane is rigged.
o
Insert one end of a flexible plastic hose (outer diameter 8.0 mm/0.31 in.) into the
tube protruding from the rudder gap at the top of the fin on the left hand side. The
other end of this hose is than connected to a suitable container and finally the
required amount of clear water is tanked.