Conditions Affecting Operation; Trim And Weight Distribution; Boat Bottom; Propeller Selection - Crusader 5.0L MPI Instruction Manual

TRIM AND WEIGHT DISTRIBUTION

Trimming of the boat and positioning of the weight (gear
and passengers) inside the boat has the following effects
on handling:
• Trimming the bow up or shifting weight to the
stern (rear).
− Normally used for cruising (running) with a
choppy wave condition (following sea) for
running at full speed
− Will generally increase speed and engine
RPM
− Will cause the bow to bounce in rough water
− In extreme, may cause the boat to porpoise
− When coming off plane, it increases the
chances of following wave splashing into the
stern of the boat
• Trimming the bow down or shifting the weight to
the bow (front)
− Normally used for cruising (running) against
a choppy wave condition, acceleration onto
plane and operating at slow planing speeds
− Will improve rough water ride and handling
− In extreme, may cause the boat to bow steer
(veer back and forth with little control)

BOAT BOTTOM

To ensure maximum engine performance, fuel economy
and boat speed, the bottom of your boat must be kept
clean and free of marine growth and barnacles. Marine
vegetation may accumulate when the boat is docked
and should be removed before operation. If the boat
is docked for long periods of time, the water inlets may
become clogged with growth and will cause the engine
to overheat.
In most areas, it is advisable to coat the boat bottom with
antifouling paint to prevent the build-up of marine growth.
Contact your dealer for advice on these requirements in
your area.

CONDITIONS AFFECTING OPERATION - 6

PROPELLER SELECTION

Best all-around performance and maximum engine life is
achieved when the engine is propped to run near the top
of (but within) the recommended full throttle RPM range
with a normal load. See ENGINE SPECIFICATIONS for
rated full throttle RPM for your model engine.
Generally, gross weight (total weight of the entire
boat, including full fuel and water, optional equipment,
passengers and other miscellaneous gear) is one of
the major factors and should be one of the primary
considerations when selecting a propeller. Other factors
to take into consideration are as follows:
If full throttle RPM is above or below the recommended
range as stated in ENGINE SPECIFICATIONS,
the propeller must be changed to prevent loss of
performance. A one-inch change in the pitch of a given
propeller will generally change engine RPM by 150 to
250 RPM.
IMPORTANT NOTICE:
engine incorporates an RPM "MAX GOVERNOR"
in order to prevent the engine from over-revving.
Operation above the Maximum RPM listed in the
chart above is not recommended. If your engine
is operating above the maximum a higher pitched
propeller is required to lower the engine maximum
RPM to the Preferred RPM listed in the chart above.
L510001-13
• Warmer weather and higher humidity will cause
an RPM loss.
• Operating the boat in a higher elevation will
cause an RPM loss.
• Operating the boat with an increased load will
cause an RPM loss (additional equipment,
passengers, etc.).
ENGINE RPM CHART
Minimum
Model Full Load
MP 5.0L 4800
MP 5.7L 5000
MP 6.0L 5400
CAUTION
Prolonged WOT operation will shorten the life of
your engine and could cause premature engine
failure. See NORMAL CRUISING SPEEDS in
SPECIFICATIONS. Problems caused by WOT
operation are considered abuse and are not covered
under the Crusader Warranty.
Preferred Maximum
4900 5000
5200 5300
5500 5600
Your new Crusader
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