Sea Ray 290 Sundancer Manuale del Proprietario Scaricare il pdf (Pagina 45)

2.13

SECTION 2 • GENERAL BOAT ARRANGEMENT

290 Sundancer

If you raise the stern drive too far while you are

on plane, you could cause a loss of speed and

power due to a condition called "ventilation." If this

happens, there will be a sudden increase in engine

RPM and a loss of speed. Do not let this condition

continue. Immediately reduce your engine RPM and

trim the stern drive DOWN slightly until the engine

slows down and you regain forward speed.

The trim gauge indicates the position of the stern

drive relative to the transom.

REFER TO YOUR ENGINE OPERATOR'S MANUAL

FOR PROPER TRIM GAUGE SETTING.

C. TRIM TABS

The trim tabs are two ﬂ at plates,

hinged below the water line on

the transom at the rear and are

raised and lowered hydraulically

by using the switches located on

the starboard switch panel at the

helm (see Fig. 2.9.2).

The trim tabs are used to adjust the sideways

listing of the boat due to uneven loading, a strong

cross wind or propeller torque. The twisting effect

of propeller torque is especially pronounced when

running the engine at high horsepower output. To

correct the listing, adjust the trim tabs to level the

boat. When the boat is level, right to left, the steering

effort will be the same for right and left turns.

Lower the trim tabs on the listing (lower) side by

pushing the top half of the trim tab switch in one-half

second bursts until the boat is righted.

Using both switches to lower both tabs on a side-

to-side balanced boat will lower the bow, when on

plane, if the rear of the boat is highly loaded. Again,

use only short bursts of the trim tab switches to

adjust the trim.

When running at cruising speed, the trim tabs should

be fully up, unless the rear is heavily loaded.

In heavy following seas or when running in an inlet,

best maneuverability is obtained with a bow high

attitude. To be sure the tabs are full up, push the

bottom halves of the switches for several seconds.

RUNNING

ATTITUDE LIST PUSH

BOW UP ...... TOP OF BOTH SWITCHES

BOW UP PORT TOP OF STARBOARD SWITCH

BOW UP STARBOARD TOP OF PORT SWITCH

BOW DOWN PORT BOTTOM OF STARBOARD SWITCH

BOW DOWN STARBOARD BOTTOM OF PORT SWITCH

EFFECTS OF POWER TRIM

(FIG. 2.13.1)

STERN DRIVE-DOWN

STERN DRIVE - CENTERED

STERN DRIVE - UP

TRIM TABS

(FIG. 2.13.2)

TRIM TAB

TRIM TAB PUMP

HYDRAULIC RAM

TRIM TAB

ZINC ANODE

HYDRAULIC FLUID

RESERVOIR FILL

HYDRAULIC RAM

TRIM TAB ROCKER

SWITCH

(AT CONTROL

STATION)

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 149 150

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Sea Ray 290 Sundancer Manuale del Proprietario Pagina 45

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