Bedienungsanleitung Navman Diesel Fuel Flow Sensors (Seite 12 von 39) (Englisch)

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Diesel fuel flow sensor kit Installation and Operation Manual

NAVMAN

Date Weather Conditions

Vessel Sea State

Displacement

Load aboard

Gearbox ratio Passengers aboard

Engines Water Tanks

Fuel Tanks

Propeller

Max. Fuel Capacity

Working fuel capacity (max x 0.9)

Notes on filling out this table

Start at a slow speed. Allow a minute or two for

the boat to settle to its speed and trim and for

the display readings to stabilise. Then write the

displayed fuel flow(s) and boat speed in a line

of the table on the right, as described below.

Then increase the engine revs by another

100 or 200 rpm, wait a minute or two for the

readings to stabilise and repeat the readings.

Take readings up to the maximum service RPM

of your engine.

Column 1 - Engine RPM

Use the Navman tachometer reading if

possible, to be sure of accurate results. Write

the engine RPM in column 1.

Columns 2 and 3 - Fuel consumption

Units are litres or gallons - we presume you will

want to work in the units you are familiar with,

and that you have set-up the system display to

work in gallons or litres.

For a single engine boat, write the flow rate in

column 2. For a twin engine boat, write the port

engine flow rate in column 2 and the starboard

engine flow rate in column 3. The numbers for

each engine on a twin engine boat should be

very similar.

Column 4 - Total fuel flow rate

This is just the sum of the port and starboard

engine figures. Add together the flow rates

in column 2 and 3 and write the sum in

column 4.

Column 5 - Boat speed

Write the boat speed through the water in

column 5. Remember that speed through the

water is not the same as GPS speed if there

are any tidal or other currents.

Column 6 - Economy

If there is a speed instrument connected to the

display then this number can be read directly

for each rpm setting. Write the economy in

column 6. Otherwise, to calculate gallons

per nautical mile divide the consumption in

gallons/hr (column 4) by the speed in knots

(column 5); or to calculate Litres per nautical

mile divide the consumption in L/hour (column

4) by the speed in knots (column 5). Write the

answer in column 6.

Column 7 - range

This is for future reference. Note - please use

the range calculated as an indication, rather

than as a range that you know you can achieve.

For safety’s sake it is strongly recommended

that the calculation is done using 90% of the full

fuel capacity - that will leave 10% of the tank

as a reserve. Call this 90% value the working

capacity of the fuel tank. Also note that the

range would apply only in calm conditions

- difficult wind or sea conditions will drastically

reduce the distance you can go on a full tank.

A more heavily loaded boat will also have its

range reduced.

To get the maximum range for each engine

rpm setting, take the economy (the number

in column 6) and multiply it by the working

capacity of the fuel tank. Write the range in

column 7.

3-1 Fuel consumption table

Photocopy this page or download a copy from www.navman.com

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