4-1
Chapter 4: performance
ChapTer 4: perFOrMaNCe
Performance Factors
Maximum performance is dependent on many factors and cannot be guaranteed. These factors
will vary with changing conditions. Some of these factors are listed below. Reference the trouble-
shooting guide on page 75 in Sportfish, Cruisers, Yachts Owner’s Manual for additional suggestions
on adjusting performance.
Engine Efficiency
Engines operate most efficiently when they are properly tuned, and the props are in good
condition. Efficiency will decrease if normal care and maintenance are not performed.
Neglecting the engines will cause power to drop and speed to decrease. In addition, expensive
repairs may become necessary. Be sure to follow all instructions in the engine operation
manual(s).
Weather Conditions
Weather conditions sway engine performance. Barometric pressure and humidity affect
horsepower. A change of weather could amount to a 10% loss in horsepower on some hot days.
Load Distribution
A decrease in performance will be noted when gear, equipment, passengers, and fuel are
added. This extra load will affect the performance of your boat according to the distribution of
the weight. Another type of extra load that could affect performance is the accumulation of
water in the bilge. Keep the bilge dry to eliminate this type problem.
Marine Growth
Maximum performance is obtained only when your hull bottom is clean. Marine growth on the
bottom of the boat will increase resistance and decrease speed. These conditions will also
increase fuel consumption. Reference "Cleaning" on page 6-1 for more information on
cleaning your hull bottom.
Trim
Trimming refers to the use of the power trim or trim tabs in order to change the running or static
attitude of the boat. The engine(s) on this boat is equipped with power trim. Power trim is
designed to enable you to change the angle of your engine(s) relative to the boat. Power trim
allows the boat to get on plane by lowering the bow. When on plane you can adjust the trim of
your engine(s) in order to avoid “plowing” or “porpoising”. See pages 63 and 83 in Sportfish,
Cruisers, Yachts Owner’s Manual
for more information. The trim tabs on your boat also control
the trim of the boat, similar to the power trim. Refer to the Trim Tabs section in Chapter 8 for
additional information.
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