540
5
AUXILIARY EQUIPMENT ON BOARD
Studio ti 03312 540-04usa
79
5.4 TRIM TABS
5.4.1 Trim tabs operation
The yacht is equipped with hydraulic trim tabs, that can be controlled from
the helm station. Each trim tab is driven by an hydraulic piston. They
allow you to adjust both fore-and-aft and athwartship trim of the yacht
during cruising.
The circuit is extremely simple. The electric signal coming from the
control switches in the helm station, reaches the electric pump, located in
the helm gear compartment.
5.4.2 Trim tabs general information
It is important to become sensitive to the use of the trim tabs. With
practice, you will learn how their position affects the performance of the
yacht and makes a difference in your comfort.
When you lower the trim tabs, you lower the bow toward the water. When
you raise them, you raise the bow. Adjusting the trim tabs is done
primarily to adjust the fore-and-aft and/or athwartships trim of the yacht.
5.4.3 Trim tabs basics
When the yacht is underway, adjust the tab positions to the angle that
gives the best performance and comfort.
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When the loads aboard the yacht (fuel, supplies, passengers, etc.)
are evenly distributed and the yacht sits level on its lines, you will use
the trim tabs in a “normal” manner.
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When weight aboard the yacht is unevenly distributed, you may have
to adjust the trim tabs individually to compensate for the uneven
weight distribution.
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The optimum trim tab position, in calm sea conditions, provides
maximum speed with minimum friction, because the trim tabs
counteract the natural tendencies of the yacht as it moves through the
water. You will learn the best positions for the tabs through
experience.
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With average speed, pay close attention to the trim tabs.
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RAISE the trim tabs when going astern.
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At the end of cruising, or when you stop the yacht, push UP both
selectors and wait for about 30 seconds to raise the trim tabs and
retract the cylinder rods.
NOTICES
The trim tabs are used to improve both passenger comfort and the
yacht’s performance.
NOTICES
RAISE the trim tabs when going astern to avoid damage to the tabs.
S
CAUTION
The trim tabs, like the rudder, can result in sudden direction changes, if
actuated too fast. It is therefore necessary to test how they respond very
carefully and in open sea.
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