Control Listing - Four winns 338 Vista Owner's Manual

NOTICE
DO NOT operate the engine with the stern
drive tilted up. Severe damage to the engine
drive system can result. Consult the Engine
Owner's manual for specific informa tion.
E - 7 TRIM TABS
Electric/hydraulic trim tabs are standard equipment
and help provide maximum control of the hull in all
water and load conditions. If 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-7 -
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 manufac-
turer's literature included in the owner's packet.
The trim tab control uses two (2) momentary-type
rocker switches. The trim tab switches 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.
Before leaving the dock and utilizing the trim tabs,
ensure the trim tabs are in the full up posi tion. Press
both lower halves of the trim tab switches and hold
(for approximately 10 seconds) until the tabs are
full up.
A. Control Listing
Wind, loading and many other factors can result in
the boat tilting or leaning towards one side while
running. This is called listing and can be negated
using trim tabs.
Pressing the lower port trim tab switch will move the
starboard trim tab upward. This will result in the port
bow of the boat being allowed to rise.
Press ing the lower starboard trim tab switch will cause
the port trim tab to move up ward and will result in the
starboard bow being allowed to rise.
Engines, Drives and Instrumentation - Section E
Pressing the upper port trim tab switch will cause the
starboard trim tab to move downward and will force
the port bow downward.
Pressing the upper starboard trim tab switch will
cause the port trim tab to move down ward and will
force the starboard bow downward.
Always establish your intended heading and attain
desired cruising speed before trying to adjust running
attitude (using the trim tabs).
Al w ays press the trim tab swit ches in short one
(1) sec ond bursts. If pressed too long, you can
ove r com pen sate, and po ten tially lose con trol.
DO NOT try to cor rect the situ a tion by pressing
the other upper trim tab switch. Instead, raise
the tab slightly by pressing the appro pri ate
lower half of the trim tab switch.
After stabilization of speed and direction, press the
upper half of the appropriate trim tab switch to achieve
a level side to side running attitude. Be sure to press
the correct trim tab switch to obtain the desired result.
After pressing a trim tab switch, always wait and allow
time for the change in trim tab position to take effect.
DO NOT continue to press the trim tab switch while
a waiting trim tab reaction. By the time the effect is
noted, the trim tab will move too far and thus overcom-
pensate.
B. Induce Planing & Controlling Trim Angle
Trim tabs can also be used to facilitate faster planing
and allow better control of the running angle.
Before accelerating and trying to gain plane, press
both upper trim tab switches. This will cause both trim
tabs to move down ward and force the bow down
when running. This can also be used when running
the boat with a heavy load aboard.
Moving the trim tabs downward will in crease the lift
and the boat will achieve plane faster, or stay on plane
at a lower engine and boat speed.
After gaining plane and establishing cruising speed,
pressing both lower trim tab switch es will cause both
trim tabs to move up ward and will allow the bow to
rise. This should be used to adjust the run ning attitude
of the boat to decrease the drag at cruising speed or
Owner's Manual Page 58