Regal LS4C Owner's Manual page 150

When running in heavy seas press the "bow down"
position which will assist the vessel to cut through
the waves. This will produce a drier and more
comfortable ride. In a following sea run the tabs in
a fully retracted angle for maximum drive response.
Sometimes you can watch the bow spray or stern
wake and the rooster tail (mound of water produced
by outboards). In a bow up position the spray is
far aft to the hull, the wake is high and the rooster
tail is high.
When trimmed or in the bow down position, the bow
spray is farther forward, the wake and rooster tail are
smaller, and positioned further behind the vessel.
Also, when trimmed you will notice that tachometers
show an increase in rpm's.
Rectifying A List
Your vessel can use the trim
tabs to rectify a list. The trim
tabs adjust the boat's attitude
in the direction the helm rocker
switch is pushed.
If the port bow is high, push the
left-hand "bow down" direction
on the dash rocker and the port bow will lower. If
the starboard bow is high, push the right-hand "bow
down" direction and the starboard bow is lowered.
Using Power Trim With Trim Tabs
may need a fine adjustment.
One advantage of the trim tab system is that it
allows trimming of the hull while the power trim
results in trimming the propeller.
Adjust the trim
tabs to achieve a
planing altitude.
Use the power trim
to position the prop
path parallel to the
water flow. At this
point the trim tabs
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