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B. Induce Planing & Controlling Trim Angle
Trim tabs can also be used to facilitate faster planing
and allow better control of the running angle.
Before accelerating and trying to gain plane, press
both upper trim tab switches. This will cause both trim
tabs to move down ward and force the bow down
when running. This can also be used when running
the boat with a heavy load aboard.
Moving the trim tabs downward will in crease the lift
and the boat will achieve plane faster, or stay on plane
at a lower engine and boat speed.
After gaining plane and establishing cruising speed,
pressing both lower trim tab switch es will cause both
trim tabs to move up ward and will allow the bow to
rise. This should be used to adjust the run ning attitude
of the boat to decrease the drag at cruising speed or
above, or when run ning in a following sea.
When running at an engine speed that results in the
boat falling off plane or causes the boat to plane
inefficiently, lowering both tabs slightly (bow down)
will improve the running angle and improve operating
efficiency.
Optimum efficien c y is obtained when operat i ng at a 3
to 5 degree running angle. Utilizing too much "Bow
Down" trim tab can reduce operat i ng effi c iency and
cause substan t ial stee r ing and handling difficul t ies.
Be extreme ly careful when running in a following sea.
The effect of trim tabs is ampli fi ed under such condi-
tions. Steer i ng and handling difficulties can result from
im proper trim tab usage, espe cially in a following sea.
If unsure of proper trim tab positioning, raise the trim
tabs to the full-up position.
When run ning at high en gine speeds, be sure
the trim tabs are in the full up posi tion. Trim tab
ac tion should be only enough to com pen sate
for any list ing. Trim tab ad just m ents at high
speeds are ex tre mely critical. Be prepared to
slow down should handling difficulties arise.
When running in a displacement (very slow speed)
mode, better efficiency will be obtained with the trim
tabs in the full-up position.
Engines, Drives and Instrumentation - Section E
C. Trim Tab Maintenance
Check the fluid level of the trim tab reservoir often.
Always keep the fluid level between the designat e d
marks on the trim tab pump-reservoir. Refer to the
manufacturers information for specifi c ations on the
type of fluid to be used and other operation and
maintenance infor mation.
E - 8
ENGINE INSTRUMENTATION
The helm station is equipped with a complete set of
engine instruments. These instruments allow the pilot
to constantly monitor the operational condi tion of the
engine. Close observa tion of these instru ments could
save the engine from damage.
Many of the V series models have individual gauges
in the dash panel. In this section we will discuss these
various gauges and their functions. See Figure E5.
Figure E5: V series Helm Station
(Representative View - Models May Vary)
NOTICE
Certain V series can be equipped with an Elec-
tronic Vessel Control (EVC) system, which in-
cludes a display panel. See Figure E6. The EVC
system display panel shows operating information
about the engine and allows you to communicate
with the engine's electrical system. Due to the
technical nature of this system it is imperative that
you refer to the engine operator's manual and
any other manufacturer's literature included in the
owner's packet for exact operating instuctions of
the EVC system and
display.
Owner's Manual Page 62
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