Cruising Speed; Power Trim - Volvo Penta 4.3GL Instruction Book

Cruising speed

Operating the engine at wide open throttle (WOT) should be av-
oided since it is both uneconomical and uncomfortable. Volvo
Penta recommends a cruising speed in the range 300 - 500
rpm lower than maximum rpm at WOT. Depending on hull type,
choice of propeller, load and conditions etc. the maximum engi-
ne speed at top speed can vary, but it should be within the
WOT range.
Wide Open Throttle (WOT) range:
3.0GS .......................................... 4200–4600 rpm
4.3GL .......................................... 4200–4600 rpm
4.3GS/Gi ..................................... 4400–4800 rpm
5.0GL .......................................... 4400–4800 rpm
5.0Gi ............................................ 4800–5000 rpm
5.7GS .......................................... 4400–4800 rpm
5.7GSi ......................................... 4600–5000 rpm

Power Trim

The hydraulic trim system (Power Trim) makes it possible to ad-
just the boat's trim for maximum comfort and fuel economy in
different operating conditions.
Every boat has its own unique characteristics that are also af-
fected by external factors. When you have got to know your
boat thoroughly you can experiment with the best trim angles
for different speed, load and sea conditions. It can generally 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. For information about the Power Trim controls and instru-
ments: See chapter Power Trim .
With the drive in the "Trim range"
WARNING! The drive should not be trimmed violently
when running at high speed. If the bow is lowered at high
speed the boat's ability to hold a course may become uns-
table. To a great extent this is dependant on the shape of
the hull and will vary from boat to boat. However, even if
safety is not compromised the result may be an unplea-
sant experience for driver and passengers, who may lose
confidence in the boat's handling.
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