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An engine that is not developing full power and the load
carried in a boat will directly affect perfor mance of the
engine. Always be sure the engine is properly tuned
and load conditions are those normally experienced,
before changing propellers.
For additional information on factors affecting perfor-
mance, please consult your Four Winns dealer.
E - 5
RUNNING ANGLE & POWER
TRIM/TILT
Hull planing surfaces have the least amount of drag
at a three to five degree angle with the water. This is
the pre ferred running angle when boating. The run-
ning angle has a signifi c ant impact on top speed and
handling. See Figure E2. Heavy load or certain water
conditions may make it difficult to achieve the optimum
running angle. The running angle can be controlled
through the use of the power trim.
A. Power Trim
Trim angle is how far in or out, the drive is posi tioned
in relation to the bot tom of the boat. The trim angle of
the drive has a distinct affect on the running angle
of the boat.
The power trim system permits control of the trim angle
of the drive relative to the boat, at the touch of a button.
It allows the drive to be raised for shallow water opera-
tion. Power trim also allows the operator to adjust the
drive while under way to provide the ideal running angle
for a given load and water condi tion. Addi tional infor-
mation can be found in the engine operator's manu al
included in the owner's packet.
B. Power Tilt
Power tilt allows the operator to raise and lower the
drive for trailering, launch ing, and beach ing. Additional
information on power tilt can be found in the engine
operator's manual included in the owner's packet.
NOTICE
DO NOT operate the motor with the water
intakes out of the water. Severe damage to the
engine systems can re sult. Consult the engine
operator's man ual for specific infor mation.
Engines and Instrumentation - Section E
Boat Properly Trimmed
Boat Too High - Trim Bow "Down"
Boat Too Low - Trim Bow "Up"
Figure E2: Running Angle
E - 6
TRIM TABS
Electric/hydraulic trim tabs may be available on the
certain SL series models. If equipped, trim tabs help
provide maximum control of the hull in all water and
load conditions. Used properly, trim tabs can:
a. Compensate for wind and load listing (level the
boat side to side).
b. Induce faster planing and help achieve opti mum
running angle (see Section E-5 - Run ning Angle
& Power Trim/Tilt).
The proper use of electric/hydraulic trim tabs requires
a basic under standing of trim tab opera tion and some
practice in calm water. Be sure to read the manu-
facturer's literature included in the owner's packet (if
equipped).
The trim tab control uses two (2) momentary-type
rocker switches. See Figure E3. The trim tab switch-
es control the attitude or position of the boat. The trim
tab switch es are labeled by position such as "Bow
Up" and "Bow Down". They are also labeled for "Port"
and "Stbd". When pressed, the label indicates what
happens to the bow of the boat.
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Owner's Manual Page 54
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