305 Conquest-Owner’s Manual
Propeller Information
Under no circumstance use a propeller which allows
the engine to operate at a higher than recommended
RPM.
NOTICE
NOTICE
It is advised that you always carry a spare propeller,
propeller hardware and propeller wrench on board.
Should your propeller become damaged it can be eas-
ily replaced.
Disconnect power by moving the battery switch to the
“OFF” position prior to removing the propeller.
DANGER
The engine(s) on the 305 Conquest have
been equipped with propellers which
our tests have shown to be best suited
for general use under normal conditions
and load. In some situations you may
wish to change the propellers to give your boat slightly
different performance characteristics. Changing your
boats running surface, such as the addition of bottom
paint will affect the type and size of propeller required.
In general, changing to a lower pitch propeller will in-
crease acceleration and load pulling capability, with a
slight decrease in top end speed. If you choose to change
propellers, the type should be discussed with your Bos-
ton Whaler® dealer.
PROPELLER
All propellers are designed to provide maximum for-
ward thrust, so the reverse thrust of the propeller will
not be as efficient. The 305 Conquest uses propellers
that are designed to counter-rotate, which means that
the port engine’s propeller rotates the opposite direc-
tion of the starboard engine. This will balance the torque
effects of the engine’s and along with the hydraulic steer-
ing will reduce driver fatigue by eliminating the constant
need to fight the wheel.
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Propeller Assembly
8
Diffuser ring
9
Blade back
10
Blade root
11
Outer hub
12
Inner hub
13
Exhaust passage
14
Drive sleeve adapter
15
Lock ring
16
Prop nut
1
2
3
4
5
6
7
8
9
10
15
11
12
13
14
16
1
Shaft, (from en-
gine)
2
Forward thrust
washer
3
Drive sleeve
4
Blade face
5
Leading edge
6
Blade tip
7
Trailing edge
1
2
3
1
Propeller Diameter
2
1 Revolution, (Pitch)
3
Propeller Rake
Section 7 - Propulsion System
54
