540
8
PROPULSION SYSTEMS
Studio ti 03312 540-04usa
135
8.5 PROPELLERS
The propellers have been designed in order to result lightly “unloaded”
with new yacht, hull clean and without displacement overloads: in this
way the engines will develop all their power in average normal operating
conditions, with hulls and propellers not perfectly clean and some
overloads on board.
Periodically check (at least once every six months) that the propellers are
not too “dirty”, as this leads to a fast performance decrease and to a
vibration increase.
In case of impact with the depth or submerged/semi-submerged bodies,
check propellers and shafts immediately; in case of considerable
vibrations, reduce the revolutions to the minimum and steer toward the
harbor for repair, as a vibration increase might damage the propelling
devices and the yacht structure.
If items such as a fishing tower, tender, davit, or anything else that
changes the displacement or trim of the vessel are added to your boat, it
may be necessary to adjust the propeller specifications. Bertram Yacht is
not responsible for any changes that may become necessary. Please
contact a propeller specialist for recommendations based on the
modifications that were made. Keep in mind that anything that adds
weight to your boat, or affects its aerodynamics or hydrodynamics, will
affect its performance.
See Maintenance in this chapter.
S
CAUTION
Dirty propellers can lead to cavitation.
The propellers check must be carried out according to the yacht
stationary waters.
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