Manual Navman Diesel Fuel Flow Sensors (page 18 of 39) (English)

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Diesel fuel flow sensor kit Installation and Operation Manual

NAVMAN

and ahead of the propeller, the degree of fouling

of the hull, and the amount of weight aboard.

You will probably not be able to find the exact

propeller load curve for your boat, but knowing

the general shape of the curve will help you

understand how your boat performs.

The important thing to notice is that, for a

correctly sized propeller, the engine is loaded to

the maximum only at the maximum RPM. (that

is where the two curves meet) At all RPM less

than maximum, the engine, if it were asked to,

could actually generate more power than the

boat requires.

For example, at 1200 rpm this engine is capable

of generating 250 horsepower, but at those

engine revs the boat only needs about 125

horsepower transmitted through the propeller.

This is where the governor on the marine

engine comes into play. The throttle on a boat

behaves quite differently from the accelerator

pedal in a car. It does not directly control the

amount of fuel the engine burns. The boat

throttle levers just set the rpms at which you

want the engine to turn - that is all. The injector

and governor system of the diesel engine then

works out how much fuel it needs to feed into

the engine to keep the engine turning at that

speed. If you ask for 1500 rpm with your boat

heavily loaded and with a lot of fouling on the

hull, the engine will do 1500 rpm, but use a lot

more fuel compared to how much it would use

if lightly laden and clean.

The theoretical propeller load

curve

For those interested, the theoretical propeller

load curve for a correctly chosen propeller

follows the form of:

Propeller load = K x RPM

Where:

y is a number that is determined by the

type of boat. The value of y can range

from around 2.2 for ducted propellers

to around 3 for slow, heavy commercial

boats. The most common value of y is

around 2.7, and for medium to high speed

pleasure boats, y is usually around 2.7.

K is deliberately chosen to make the curve

pass through the point on the engine

power curve that is max revs/max power.

To work out K for a pleasure craft use:

Some engine manufacturers will plot an ideal

propeller load curve on their engine data

sheets, using an exponent of 2.7.

K =

Maximum engine power

Maximum engine RPM

2.7

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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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