Volvo Penta D4 Operator's Manual page 39

Operating with the drive in the Trim range
The Trim range is used to achieve maximum comfort
under normal operation at all speeds from start to
maximum speed.
Since every boat has its own unique characteristics
and will be effected in different ways by the factors in-
volved, only general advice is given here on how to
get the best trimming angle for your boat. It can gener-
ally be said that when the boat feels well-balanced,
easy to steer and pleasant to operate, then that is the
optimal trim angle for the boat.
When starting
Trim the drive. The bow will be pressed down and the
boat accelerates faster. This gives improved running
and steering characteristics at speeds below the plan-
ing threshold.
At planing speed
Trim the drive out to the operating position which pro-
vides the most stable and comfortable running.
If the boat has twin motors the drives can be trimmed
with different angles to compensate for side winds and
to a certain extent compensate for uneven loading on
one side of the boat or the other.
For maximum fuel economy
Operate engine at a steady throttle opening. Trim the
drive out/in slightly. The boat is most easily propelled
and speed will increase in the position that gives the
highest engine speed. The throttle opening can then
be slightly reduced to retain the original speed.
In choppy seas or running against a heavy sea
Trim drive so the bows drop. This will provide more
comfortable running.
Operating with the drive in the Beach
range
The beach range is used for operation at reduced
speed in shallow water or where water depth is uncer-
tain.
IMPORTANT! Max. permitted engine speed (rpm)
when running in the "Beach range" is 1 500 rpm.
Check that drive is never trimmed so that the
cooling water intake is out of the water.
Operation
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