5.3.1 Once the craft has reached the required
test speed during a tank run, the watertight bow aperture(s) are to
be rapidly opened and are to remain open until the point at which
the model is decelerated at the end of the run. At that point the
watertight shutters are to be rapidly closed to trap the water collected
inside the model. This water is to be measured directly after the
tank run (5.5.3 refers) and the water is to be removed from the model
after each run.
5.3.2 A weight made of high density material,
such as lead or steel, equal to the mass of water collected at the
end of each tank run is then to be placed on the vehicle deck, on
the centreline of the craft and at the longitudinal mid point of the
vehicle deck. This weight should be cuboid in shape, with length and
beam selected to fit the available deck space, aiming not to restrict
the water flow on the vehicle deck. This may allow for more water
to accumulate on the ro-ro deck than what would be the case in one
continuous run but this error is likely to be small and on the side
of safety.
5.3.3 This process is to be repeated for each
run of a test case.