Fuel Consumption Curves - Navman Tracker 5505 Installation And Operation Manual

10-6 Fuel consumption curves

A fuel consumption curve shows fuel consumption (fuel used per unit of distance travelled) and
boat speed as a function of engine RPM. Fuel consumption curves require engine RPM, which
requires SmartCraft or diesel sensors to be installed. Fuel consumption curves are powerful tools
for assessing boat performance in different conditions and for helping you to run at the most
economical speed for the conditions.
10-6-1 Making a fuel consumption curve
To make a fuel consumption curve you will
need to run the boat in a straight line for about
15 minutes using the engine's full RPM range.
For your first curve, choose a calm day with
light wind and little current; have a typical load
and a freshly cleaned hull. Later, you can make
fuel consumption curves for different boat,
weather or sea conditions. Compare these
with your first curve to see how your boat's
performance changes with conditions.
Making a curve
1 Start running the boat in a straight line.
2 Choose a speed source for the curve (see
section 10-5-1). Normally choose Water
speed to measure the boat's potential
performance.
3 Press one or more times to display
the Setup menu, then select Fuel.
Select Fuel consumption curve,
4
then select New.
5 Enter the comfortable maximum RPM you
know you can achieve for the engine rather
than the maker's value.
6 The TRACKER then asks you to set the
minimum RPM. Set the throttle to idle; on a
multi engine boat set all engines to about
the same idle RPM.
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Now, do not change the engine speed.
Wait for about 60 seconds for the boat to
stabilise, then press
fuel computer records the data.
7 The TRACKER then asks you to set the
throttle to achieve a target RPM. On a multi
engine boat set all engines to about the
target RPM. When the engine RPMs are
correct, the Target RPM box will turn green.
Now, do not change the engine speed.
Wait for about 60 seconds for the boat to
stabilise, ensuring the Target RPM box stays
green. Then press
computer records the data.
8 The TRACKER repeats the above step to
record data up to the maximum RPM.
Then the TRACKER asks if you want to save
the curve. Select Yes. The fuel computer
asks for a name for the curve. Change the
default name if required. Then press
The TRACKER stores the new curve.
Note To interrupt making the curve at any time,
press .
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. Wait while the
. Wait while the fuel
.
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