Silverton 43SB, Owner'S Manual

Page: 123 / 207

SYSTEM OPERATIONS-63
TRIM TAB SYSTEM
The purpose of the Trim Tab System on
your 43SB is to assist in reaching plan-
ing speed as soon as possible and to
maintain a proper “Running Attitude” while
in forward motion. “Running Attitude” is
de
fi ned as the level of the boat, both fore
and aft and athwartships, while the vessel
is underway. Your yacht, upon reaching
planing speed, should rise slightly in the
bow and should not list to either side for
the greatest stability and fuel economy.
Your
43SB is equipped with two (2) trim
tabs, each measuring 12” x 24”, which are
mounted on the trailing edge of the tran-
som (See photograph below, which illus-
trates the location of the Port Trim Tab).
Each Trim Tab operates independently
of each other and they are controlled by
separate rocker-type switches, located on
the Helm Switch Panel (Refer to the Elec-
trical Pages in this section of this Owner’s
Manual for the location of these switches).
Each Trim Tab is actuated by a hydraulic
cylinder, which moves them in an Up or
Down motion.
The position as determined by depressing
the rocker-type switches as follows:
Depressing the TOP of the switch low-
ers the Trim Tab.
Depressing the BOTTOM of the switch
raises the Trim Tab.
The Trim Tab System operates in the fol-
lowing manner:
The function of the Trim Tab is to redi-
rect the fl ow of water beyond the bottom of
the transom. This creates an upward pres-
sure on the hull bottom at the transom,
which results in lowering the bow.
When the Port Trim Tab is lowered, the
Port stern section is raised, which lowers
the Starboard side of the bow.
When the Starboard Trim Tab is low-
ered, the Starboard stern section is raised,
which lowers the Port side of the bow.
Both Trim Tabs should be lowered/
raised as needed to maintain a proper
“Running Attitude”.
Operation of the Trim Tab System may
require practice to attain a level of pro-
fi ciency. DO NOT operate either Trim
Tab to its extreme lowered position
suddenly. This may cause the bow to
lower to an unsafe position while head-
ing into or away from waves, which
may cause “swamping” of your yacht,
resulting in possible injury or death.
DO operate the Trim Tab switches with
short “bursts” until the desired “Run-
ning Attitude” is obtained.
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