attitude with continued acceleration. This maximum
angle is known as the “hump”. Because visibility,
At this point your boat will be plowing through the wa-
ter with the bow down too far. Trim the lower unit up
handling, and performance are reduced, it is advisable slightly until the bow comes up. If you trim the lower
to get “over the hump” as soon as possible. A few sec- unit out too far, your boat will porpoise or the propel-
onds at full throttle should get the boat over the hump
and into its planing attitude.
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.
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.
Trim your boat to compensate for seas, winds,
or uneven loads.
T - 7 TRIMMING YOUR BOAT
Trim drives in more than
usual. Use tabs to keep
bow down and move at
a slower speed.
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 T-2). 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.
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 starboard, press port bow
down switch. If listing to
Use tabs independently to
adjust for list. If listing to
port, press starboard bow
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 T-2: Trimming the Boat with Trim Tabs
Prelaunch and Underway - Section T
Owner’s Manual Page 137
|Categories||Four Winns F-Series Manuals, Four Winns Manuals|
|Tags||Four Winns F|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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