Trim Tabs - Regal 53 SC Owner's Manual

TRIM TABS-MANUAL
Operational Overview
tabs are raised and lowered from the dash switches. This
change in water fl ow creates upper pressure under the
tabs, and raises the stern. When the stern rises, the bow is
lowered. Lowering the port tab will cause the port stern
to rise, making the starboard bow lower. Lowering the
starboard tab will cause the starboard stern to rise, making
the port bow lower.
Using trim tabs will compensate for uneven weight
distribution, listing, water conditions, wind velocity and
other factors that cause ineffi cient operation.
Your Regal yacht reaches a planing position at a designated
speed determined by bottom design, weight distribution,
water conditions, and on board equipment. As the throttle
is advanced the stern squats and the bow rises initially. The
trim tabs allow your boat to plane at a slower speed than
natural conditions allow.
As the boat breaks over the bow high attitude the boat
speed accelerates and visibility increases.
If the boat is over trimmed, it will plow the bow and the
boat will lose maneuverability.
As the operator gains more confi dence and experience
he will develop a feel for the tabs effect on the vessel to
achieve the best running angle for sea conditions.
Standard trim tabs are
installed on the lower
hull outside transom area.
Note that an optional
Auto Glide™ boat control
system is found in Chapter
8.
The standard trim tabs
measure 24" wide by 16"
deep. Water is deflected
and redirected as the trim
Note that anodes should be replaced when one-third sac-
rifi ced. Anodes help defend against electrolysis.
DUAL CYLINDERS
TRIM TAB TRANSOM OVERVIEW
When trimmed or in the bow down position, the bow
spray is farther forward, the wake is smaller, and positioned
further behind the vessel. Also, when trimmed you will
notice that the tachometers show an increase in rpm's with
less load on the engines.
Your vessel can use the trim tabs to rectify a list. The trim
tabs adjust the boat's attitude in the direction of the helm.
Porpoising is a running condition where the bow
"bounces" up and down similar to a porpoise motion. This
condition can be eliminated with the proper defl ection of
the standard trim tab helm switch.
It is recommended that the Zeus tabs fi rst be used in the "AUTO"
mode and then the standard tab switch be used for fi ne tuning the ride.
100
Chapter 4
SACRIFICIAL
ANODE
TRIM TAB