2007 MasterCraft Owners Manual - Page 10-2
With both steering and propulsion at the rear of the boat, the initiation of a turn pushes the stern of the boat
away from the direction of the turn. The stern follows a larger turning circle than the bow. This is especially important
to remember when making close quarters maneuvers.
While the effects of unequal propeller thrust (torque steering), wind, and current may not always be present, a
practiced driver will use them to his advantage.
Unequal thrust is a phenomenon shared by all single-engine, propeller-driven boats. A counterclockwise rota-
tion propeller tends to cause the boat to drive to port when going forward, and to starboard when going backward,
with the rudder in the straight-ahead position.
At high speed, there is compensation for this effect, and it is virtually non-existent. But, at slow speed—and
especially during backing—the effect can be very pronounced. This is the main reason most experienced drivers ap-
proach with the dock to the starboard of the boat.
Stopping—or checking headway—is a technique that must be mastered. With no brakes, reverse must be used
to stop the boat. The momentum of the boat will vary according to the load. Make it a practice to slow to no-wake
speed before shifting into reverse.
When practicing maneuvering techniques, always do so in open water that is free of traffi c. Adequate practice
may make the difference between a pleasurable experience or a damaging—at the least, embarrassing—one.
High Speed Operation
Your MasterCraft boat was designed to be a high-performance ski boat. You may have
seen professional drivers with advanced operating skills perform high-speed maneuvers and
on-a-dime turns. DO NOT attempt to duplicate or simulate these feats. Paid, professional driv-
ers log thousands of hours on the water and carefully choreograph every move. Plans are
made in advance in the event the routine must be aborted. Maneuvers of this nature could
cause serious injury or death, as well as damage to your MasterCraft that will not be covered
under warranty.
For the best engine performance and longevity, the wide-open-throttle (WOT) engine operation must be near
the top of, but within, the specifi ed WOT operating range. To adjust the WOT operating range, you must select a
propeller with the proper diameter and pitch. The propeller supplied with your boat was chosen for best all-around
performance under average operating conditions.
Load, weather, altitude and boat condition all affect WOT engine operation. If you use your boat for several
different applications such as wakeboarding, barefooting and cruising, it may be necessary to have two or more pro-
pellers of different size and pitch to allow the engine to operate in the WOT range for each application.
Propping the boat should be done after the engine break-in
and the initial 10-hour dealer check. The boat should be loaded the
way it would normally be for each application. For example, if you
are propping the boat for wakeboarding, fi ll the ballast tanks and add
the people and gear you would normally expect to carry in the boat.
Take the boat out and after warm-up run it at wide-open-throttle and
note the maximum RPM. EFI engines are equipped with RPM limiters
to prevent over-revving. Take note if the RPM limiter is activated.
If the WOT RPM is higher than the maximum RPM in your
engine’s WOT operating range, the boat is under-propped. The en-
gine operating ranges for engines in MasterCraft boats are:
RPT-1 engine:
4600-5000 RPM
MCX engine:
4800-5200 RPM
LY6 engine:
5200-5600 RPM
8.1 Liter engine:
5000-5400 RPM
Crusader engine:
See Crusader manual for information.
Installing a higher-pitched propeller will reduce the WOT
RPMs.
An engine that is over-revving may quickly experience cata-
strophic damage.
Содержание 2007 MariStar
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