Boston Whaler 420 OUTRAGE, Owner'S Manual

Page: 140 / 268

3-46 420 Outrage
Chapter 3 • Systems Overview & Operation
R
Propeller
• It is advised that you always carry a spare
propeller, propeller hardware and propeller
wrench on board. Should your propeller
become damaged it can then be easily
replaced.
• Under no circumstance should you use a
propeller which allows the engine to
operate at a higher than recommended RPM.
NOTICE
The engines on your boat have been equipped with
propellers which our tests have shown to be best
suited for general use under normal conditions
and load. Your boat has been propped to achieve
maximum RPMs which meet Mercury requirements.
Trimming the Engines
When trimmed correctly, your boat will achieve
maximum RPMs, minimize steering effort, allow for
more stability and increased performance.
Trimming the engines IN full will drive the bow
down causing the boat to plow through the water and
will prevent the engines from achieving maximum
RPMs.
Trimming the engines OUT will push the stern down
and raise the bow. If OUT too far the maximum
engine RPMs cannot be achieved.
A properly trimmed boat will have the bow slightly
UP while running at full speed.
Different seas or operating conditions will necessitate
running the boat in different trim positions. The
operator will need to use his/her best judgement while
boating in different conditions.
Propeller Pitch & Diameter
Fig. 3.46.1
PITCH
DIAMETER
1
2
1
2
!
DANGER
Disconnect power by moving the battery switch
to the “OFF” position prior to removing the
propeller.
Propeller Assembly
Fig. 3.46.2
1
2
3
4
5
6
7
8
ENGINE SHAFT
FORWARD THRUST WASHER
DRIVE SLEEVE
INNER HUB
BLADE BACK
OUTER HUB
EXHAUST PASSAGE
DIFFUSER RING
PROP NUT
LOCK RING
DRIVE SLEEVE ADAPTER
BLADE TIP
LEADING EDGE
TRAILING EDGE
BLADE FACE
9
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
10
11
12
13
14
15
Changing Propellers
In some situations you may wish to change the
propeller to give your boat slightly different
performance characteristics.
In general, changing to a lower pitch propeller will
increase acceleration and load pulling capability, with
a slight decrease in top end speed. If you choose