Silverton 45 convertible, Operator'S Manual, Page: 137 / 227

SYSTEM OPERATIONS-77
TRIM TAB SYSTEM
The purpose of the Trim Tab System on
your 45C is to assist in reaching planing
speed as soon as possible and to main-
tain a proper “running attitude” while in for-
ward motion. “Running Attitude” is de
fi ned
as the level of the boat; both fore, aft, and
athwartships, while the vessel is under-
way. Your yacht, upon reaching planing
speed, should rise slightly in the bow and
should not list to either side for the great-
est stability and fuel economy. Your
45C
is equipped with two (2) Bennett Trim
Tabs , each measuring 12” x 24”, which
are mounted on the trailing edge of the
transom (See photograph below, which il-
lustrate 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
lowers 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 redirect
the fl ow of water beyond the bottom of the
transom. This creates an upward pressure
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 lowered,
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.
Maintenance of the Trim Tab System is
as follows:
Silverton recommends painting the trim
tabs with good quality, antifouling bottom
paint. Cylinders should be in the full UP
position before painting.