SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK
Ventus-2cM
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 tank is filled as follows – with the horizontal tailplane in place (elevator
trim fully aft) or removed:
Insert one end of a flexible plastic hose (outer diameter 8.0 mm/0.31 in.) into
the tube (internal diameter 10.0 mm/0.39 in.) 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 which is to be filled with the required
amount of clear water.
The fin tank has for every Liter spill holes, all properly marked, on the right
hand side of the fin, which indicate the water level – see accompanying
sketch.
The venting of the tank is through the uppermost 7.8 kg/Liter hole (which
always remains open – even with a full tank).
The ballast quantity to be filled depends on the water load in the wing tanks –
see loading table on page 6.2.7 and 6.2.8
Before filling the tank, always tape closed one hole less than the load
required, measured in kg/Liter.
If, of instance, a fin ballast load of 3.0 kg /Liter 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.
November 2003
Revision –
FLIGHT MANUAL
Tank label of the right hand side of the fin
LBA-app.
4.5.6.3
1 kg/Ltr.
2
3
4
5
6
7
7.8
Summary of Contents for Ventus-2cM
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