4-5
460 Express Series
Basic Systems Operation
Propellers
The propellers installed on your yacht were selected because their
diameter and pitch provide the optimum speed and performance
under average conditions of load. Propeller selection must be based
on the ability of the engine to turn the propeller and achieve the
manufacturer’s recommended RPM at full throttle.
SELECTING A PROPELLER
First, ensure that the diameter and pitch provide the desired
performance. The engine RPM at full throttle should be in the upper
half of the recommended full throttle operating range. If RPMs are low,
a propeller with a smaller pitch will increase RPMs. If RPMs are high,
a propeller with an increased pitch will lower RPMs.
Second, ensure that the propeller rotation is consistent with engine
and gear box rotation. Your yacht is designed with counterrotating
inboards for minimum torque effects.
Third, ensure that the installation provides adequate safety features
such as a straight key, a propeller nut, a jam nut and a cotter pin.
A
CAUTION
Propellers can be very sharp. Be careful when you
handle them. Wear protective gloves when handling
any propeller. Remove the key from the ignition switch
and remove the Emergency Stop Switch Clip, if you
yacht is equipped with stop switches, to prevent
accidental starting of the engines. Do not use
damaged propellers. Damaged propellers can damage
your engine and boat.
NOTE
Variations from average loadings, bottom condition and/or
engine condition could call for a propeller change to
achieve the performance desired.
A
CAUTION
Improper propeller selection and installation could
result in loss of the propeller, and/or excessive
stresses on the power train leading to power train
failure. Cruisers Yachts recommends that you consult
with, and employ the skills of your Cruiser Yachts
Dealer when contemplating a propeller change.
A
WARNING
Dual engine installations normally include a standard
rotation engine and a counter-rotation engine. If you
remove the propellers, make sure the propeller is
correct for the rotation of the engine before operating
the yacht. Always follow the instructions in the stern
drive owner’s manual in the Skipper’s Kit when
removing, replacing and selecting a propeller.
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