Volvo D4, Operator'S Manual

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56
Operation
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 load-
ing on one side of the boat or the other.
Operating in “Bow-up” Position
The “bow-up” position is normally used for cruising,
running with a choppy wave condition, or running at
full speed. In a full “bow-up” position the boat may
tend to self-steer. You may have to compensate with
the steering wheel to keep the boat in a straight-
ahead path. In this position the boat’s bow will tend to
raise clear of the water. Excessive “bow-up” trim will
cause propeller ventilation resulting in propeller slipp-
age. Engine RPM will also increase, but boat speed
will not increase and may even drop.
IMPORTANT ! Use caution when operating in
rough water or crossing another boat’s wake.
Excessive “bow-up” trim may result in the boat’s
bow rising rapidly and possibly throwing the
boat’s occupants into the water.
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. See section "Operating in Bow-
down Position"
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 un-
certain.
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.