Yanmar 4JH3-TCE Specifikace stáhnout pdf (Strana 15)

4. Starting the New Sail-Drive for the First Time

Note: The propeller shaft output becomes

95% of the engine rated output (continuous

rating at crankshaft) in consideration of me-

chanical efficiency 95% of the sail-drive.

(3) In the case of propeller calculation,

further add 5%, at minimum, as the

sea margin to the aforementioned

matching point. That is, 95% of the

propeller shaft rated output (Con-

tinuous rating at propeller shaft)

becomes the best propeller match-

ing. Note about sea margin: In actu-

al navigation, there is an increase

in resistance due to the waves,

wind and fouling of the hull and,

moreover, a drop in the efficiency

due to fouling of the propeller. Con-

sequently, in the case of propeller

calculation, it is necessary to allow

the engine output to have some

margin. For that reason, it is neces-

sary to add the sea margin of 5%, at

minimum.

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Yanmar 4JH3-TCE Specifikace Strana 15