Four winns SL series, Owner'S Manual

Page: 151 / 175

Owner’s Manual Page 148
Pre-launch & Underway - Section S
At this point your boat will be plowing through the wa-
ter with the bow down too far. Trim the lower unit up
slightly until the bow comes up. If you trim the lower
unit out too far, your boat will porpoise or the propel-
ler will cavitate, and the bow will slam up and down
on the water. Your boat is trimmed correctly when it is
just short of porpoising or propeller cavitation, under
ideal running conditions.
Trim your boat to compensate for seas, winds,
or uneven loads.
Head Seas Trim drives in more than
usual. Use tabs to keep
bow down and move at
a slower speed.
Following Seas To prevent taking sea-
water over the bow, trim
drives out and keep tabs
up to keep bow up.
Listing Due to Quar
-
tering Seas, Beam
Wind, or Uneven Load
Use tabs independently to
adjust for list. If listing to
starboard, press port bow
down switch. If listing to
port, press starboard bow
down switch.
attitude with continued acceleration. This maximum
angle is known as the “hump”. Because visibility,
handling, and performance are reduced, it is advisable
to get “over the hump” as soon as possible. A few sec
-
onds at full throttle should get the boat over the hump
and into its planing attitude.
After getting over the hump, accelerate until reaching
a comfortable plane, then throttle down to cruising
speed. This also will provide for better fuel efficiency.
S - 7 TRIMMING YOUR BOAT
A. Trim Tabs (Applicable Models Only)
Trim tabs are used to add lift to the boat’s stern, there-
by changing the boat’s attitude (see Figure S2). This
lift can help the boat get on plane faster and remain
on plane at slower speeds than if no tabs were used.
Used independently, tabs can also correct listing
conditions caused by crosswinds, unbalanced load-
ing and quartering seas. Trimming your boat properly
involves two separate procedures, trimming or tilting
the lower unit and setting the trim tabs.
When you are sitting dead in the water, your drive
should be down and the trim tab switches are in the
BOW UP position. Accelerate until you get onto plane.
Figure S2: Trimming the Boat with Trim Tabs