Dougherty Everglades 273CC - Trim Tabs

5050
Helm Control Systems
4.9 Trim Tabs
The recessed trim tabs are mounted to the hull
below the swim platform and integrated transom
engine mounting system. A dual rocker switch is
used to control the trim tabs. The switch controls
bow up and down movements. It also controls
starboard and port up and down movements.
Bow up and bow down will control the hull planing
attitude, while port and starboard up and down
provides control for the hull listing.
LED lights built into the switch display the position
of each trim tab. When one LED is ashing at the
top of the display, the tabs are in the “full-up” (bow
up) position. When all LED lights are lit from the
top to the bottom of the display, the tabs are fully
extended (bow down).
The trim tabs are programmed to automatically
retract when the engines are shutdown to keep
the actuators clean and set the tabs in the full
“UP” position when leaving the dock. Refer to the
trim tab operating manual for more information on
the operation and programming of the trim tabs.
Before leaving the dock, make sure that the tabs
are in the full “UP” position. If they are not, press
and hold the control in the bow up position for ten
(10) seconds to fully retract the tabs.
Always establish the intended heading and cruise
speed before attempting to adjust the hull attitude
with the trim tabs. After stabilizing speed and
direction, move the trim tabs to achieve a level
side to side running attitude being careful not to
over trim.
After depressing a trim tab switch, always wait a
few seconds for the change in the trim plane to
take eect. Avoid depressing the switch while
awaiting the trim plane reaction. By the time the
eect is noticeable the trim tab plane will have
moved too far and thus the boat will be in an
overcompensated position.
When running at a speed that will result in the
boat falling o plane, lowering the tabs slightly,
bow down, will improve the running angle and
operating eciency. Too much bow down tabs can
reduce operating eciency and cause substantial
steering and handling diculties.
Be extremely careful when operating in a following
sea. The eect of trim tabs is amplied under such
conditions. Steering and handling diculties can
Trim Tab Plane & Cylinder
Typical Trim Tab Switches
result from improper trim tab usage, particularly
in a following sea. Always raise the tabs to the
full bow up position in these conditions.
When running at high speeds be sure that the
tabs are in the full “UP” position. Only enough
trim plane action should be used to compensate
for any listing. Trim tabs are extremely sensitive
at high speeds. Adjust for this and be prepared
to slow down if diculties arise.
When running into a chop, a slight bow down at-
titude will improve the ride. Be careful not to over
trim. Handling diculties may result.
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