Running Angle & Power Trim/ Tilt - Four winns 338 Vista Owner's Manual

These Vista models use surface water as a cooling
®
medium for the heat exchanger. The cooling water
employed enters the system through a water intake
and is relinquished through the exhaust manifold
system. Some boating areas require that additional
water intake filters be installed. Refer ence Section P-3
- Equipment Installation, in this manual for installa tion
instruc tions and consult your Four Winns dealer
regard ing any special equip ment that may be re-
quired.
Should an en gine in take or an ex ha ust or
cool ing hose rup ture, turn the en gine off and
close the seacock immediately. Proceed under
tow, if neces sary, to a service facility for
appropriate repairs; maintain a close visual
watch on the prob lem hose and also on the
bilge water level.
E - 6 RUNNING ANGLE & POWER TRIM/
TILT
Hull planing surfaces have the least amount of drag at
a three to five degree angle with the water. This is the
pre ferred running angle when boating. The running
angle has a signifi cant impact on top speed and
handling. Heavy load or certain water conditions may
make it difficult to achieve the optimum running angle.
See Figure E4.
The running angle can be controlled through the use
of power trim (stern drives) and/or trim tabs. See
Section E-8 - Trim Tabs and Section S-7 - Trimming
Your Boat for information on the use of trim tabs and
tilt/trim control switches.
Engines, Drives and Instrumentation - Section E
Figure E4: Running Angle
A. Power Trim
Trim angle is how far in or out, the lower unit is
positioned in relation to the bottom of the boat.
The trim angle of the lower unit has a distinct affect
on the running angle of the boat.
The power trim system permits control of the trim
angle of the drive unit relative to the boat, at the touch
of a button.
It allows the drive unit to be raised (trimmed out) for
shallow water opera tion. Power trim also allows the
operator to adjust the drive unit while under way to
provide the ideal running angle for a given load and
water condi tion. Addi tional infor mation can be found
in the engine owner's manu al.
B. Power Tilt
Power tilt allows the operator to raise and lower
the drive unit for trailering, launching, and beach ing.
Additional information on power tilt can be found in
the engine manufacturer's manual includ ed with this
manual.
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Owner's Manual Page 57