Maneuvering - Bukh D4 Operator's Manual

Instruments and Controls

Maneuvering

The correct trim setting provides the best comfort when
driving.
Every boat has its own unique characteristics and
reacts differently to how you trim it. We can therefore
only give general advice about how you reach the best
trim angle for your boat. It can generally be said that
when the boat feels well balanced, is easy to steer and
comfortable to drive - than you have found the optimum
trim angle.
Make a few trips at low speed to experience the effect
of Power Trim and the different trim ranges, to see
what effect they have on the boat. Note how long it
takes for the boat to reach planing speed. Check the
tachometer, speed and the response of the boat.
Trim the drive down
The bows are pressed down and the boat accelerates
faster. It also provides better driving and steering
response at speeds below the planing threshold.
Driving with "bow down"
The "bow down" position is normally used during
acceleration up to planing speed, at low planing
speeds or with a short sea. With full "bow down", the
boat has a tendency to self-steer. You may have to
compensate with the wheel to keep the boat on the
right course. In this position, the bow of the boat tries
to go deeper in the water. If the boat is driven at high
speed or towards high waves, the bow will plough
downwards into the water. The boat can start to steer
with the bows or yaw suddenly so that passengers may
be thrown overboard.
The boat's trim shall always be adjusted to give well
balanced steering. Certain combinations of boat,
engine and propeller can cause instability and/or self-
steering tendencies when the boat is driven at or close
to the maximum "bow up" or "bow down" positions. The
stability and steering characteristics of the boat can
also vary depending on the sea conditions. Contact
your Bukh dealer to correct these tendencies if your
boat shows instability an/or self-steering tendencies.
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