Manual Navman Diesel Fuel Flow Sensors (page 17 of 39) (English)

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Diesel fuel flow sensor kit Installation and Operation Manual

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Engine curves are published by the manufacturer

of every engine. If you do not have the curve

for your engine, ask your marine dealer for

the curve.

Usually there will be several curves showing

the different characteristics of your

engine

5 Measuring engine performance

In the above graph:

a The top line shows the maximum power

that the engine is able to provide at each

engine rpm setting - the amount that

would be available if you were to ask

for it. This curve will be published by your

engine manufacturer.

b The lower line shows the propeller load

curve. This is amount of power required

to propel the boat, with the engine doing

those RPM (Remember that usually there

is a gearbox between the engine and

propeller - for all this discussion we will

refer to the RPM of the engine, not the

RPM of the propeller itself).

It takes a set amount of power (hp or kW) to

drive a particular hull at a particular speed, and

it doesn’t matter what the engine is, or how

much extra power might be available, or what

rpm and gearbox ratio you use. It is roughly

equivalent to the power required to tow the

boat through the water. So the lower curve

represents the power that the propeller draws

from the engine, or the load that the propeller

puts onto the engine.

This propeller load curve (the lower line in the

above graph) depends on many things, and is

unique to your boat. The propeller load curve

depends obviously on the diameter and pitch of

the propeller, but also on the hull shape around

5-1 Engine power and propeller curves

- horsepower

, fuel consumption etc, each

plotted against engine revs.

The curve we want to discuss is the power

(horsepower or kW) versus engine RPM. The

curve will look something like this:

Power - horsepower

Engine RPM

600 800 1000 1200 1400 1600 1800 2000 2200 2400

Maximum engine RPM

Propeller load

Power

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Others manual(s) of Navman Diesel Fuel Flow Sensors

Navman Diesel Fuel Flow Sensors User Manual - German - 34 pages

Navman Diesel Fuel Flow Sensors User Manual - Dutch - 32 pages

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Navman Diesel Fuel Flow Sensors Manual

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