8 - PROPULSION SYSTEM275
8.14 PROPELLERS
The propellers (1) have been designed in order to result lightly “unloaded”
with a new yacht, hull clean and without displacement overloads: in this way
the engines will develop all their power in average normal operating condi-
tions, with hulls and propellers not perfectly clean and some overloads on
board.
Periodically check if 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 re-
pair, as a vibration increase might damage the propelling devices and the
yacht structure.
CAUTION
RIVA yachts are designed to obtain a correct transversal trim with full op-
tional equipment, and with spare propellers and shafts.
If the yacht is not provided with full optional and with spare propellers and
shafts, some weights are inserted to correct the transversal trim.
The above-mentioned weights can be removed or displaced as soon as
the yacht is provided with a new equipment.
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