NorthStar EXPLORER 657 Installation And Operation Manual page 50

12-6-2 Managing fuel consumption curves
Renaming a curve
1 Press twice, then select Fuel.
2 Select Fuel consumption curve.
Select Name and select the name of the
curve to rename.
3 Select Rename and press
the name.
12-6-3 Using fuel consumption curves
Deleting a curve
1 Press twice, then select Fuel.
2 Select Fuel consumption curve.
Select Name and select the name of the
curve to delete.
3 Select Delete.
Selecting a curve
1 You must make a fuel consumption curve
before you can use it (see section 12-6-1).
2 On the Fuel window, press
Fuel consumption curve and select the name
of the curve to use.
3 On the fuel window, press
to select Fuel curve and display the fuel
consumption curve.
Note:
a On a multi engine boat, keep the RPM of all
engines similar while using a curve.
b The shape of the curve depends on the type
of speed sensor you selected when making
the curve (see sections 12-5-1 and 12-5).
50
Using a curve
. Change
Compare your boat's performance now, at the
current RPMs, with the boat's performance when
you made the curve. You can compare your
boat's performance now with a curve made
under ideal conditions or with a curve made
under similar conditions.
Information in a curve
A RPM of the boat now. For a twin engine boat,
B
, select
C
if necessary
D Blue curve: fuel consumption at different
E
F
Northstar Explorer 657 Installation and Operation Manual
F
E
D
B
C
A
the RPM is the average of the two RPMs.
Red curve: boat speeds at different
RPMs recorded when you made this fuel
consumption curve.
Red marker: the boat speed now. This marker
is below the red curve, showing that the boat
speed now at this RPM is less than when you
recorded the curve.
RPMs recorded when you made this fuel
consumption curve.
Blue marker: the fuel consumption now. This
marker is below the blue curve, showing
that the fuel consumption now at this RPM is
better than when you recorded the curve.
If the blue curve has a dip, then running the
boat at this RPM will give the best speed for
the least fuel consumption.