Wellcraft Cruisers Manuel du propriétaire télécharger pdf (Page 89)

Before bringing your boat “on plane”, check the

entire area to make sure you have a clear, safe

path. As you throttle up to accelerate, your boat

will increase its angle of trim, causing the bow

to ride high. From a maximum angle, the boat

will level out to its planing attitude with contin-

ued 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

seconds 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.

TRIMMING YOUR BOAT

Trim tabs are used to add lift to the boat’s

stern, thereby changing the boat’s attitude (see

Figure 10.2). This lift can help the boat get on

plane faster and remain on plane at slower

speeds than if no tabs were used. Used inde-

pendently, tabs can also correct listing

conditions caused by crosswinds, unbalanced

loading and quartering seas. Trimming your boat

properly involves two separate procedures, trim-

ming or tilting the lower unit and setting the trim

tabs.

When you are sitting dead in the water, your out-

board should be down and the trim tab switches

are in the BOW UP position. Accelerate until you

get onto plane. At this point your boat will be

plowing through the water 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 propeller 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 cavita-

tion, under ideal running conditions.

Trim your boat to compensate for seas, winds,

or uneven loads.

10-6

STARBOARD TAB LOWERED

• STARBOARD STERN RISES

• PORT BOW LOWERS

PORT TAB LOWERED

• PORT STERN RISES

• STARBOARD BOW LOWERS

STERN

TRIM TAB

HULL

AS WATER PASSES UNDER

THE HULL AND HITS THE

TRIM TAB, THE STERN OF

BOAT IS PUSHED UP.

FIGURE 10.2 TRIMMING THE BOAT WITH TRIM TABS

Head Seas Trim drives in more than usual.

Use tabs to keep bow down

and go at a slower speed.

Following Seas To prevent taking seawater

over the bow, trim drives out

and keep tabs up to keep bow

up.

Listing Due to Use tabs independently to

Quartering Seas, adjust for list. If listing to star-

Beam Wind, or board, press port bow down

Uneven Load switch. If listing to port., Press

starboard bow down switch.

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Wellcraft Cruisers Manuel du propriétaire Page 89

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