Volume 2 number 6, pages: 7 - 18
In this paper the economy of the different marine plants is elaborated. Particular attention is given to the elaboration of the propeller power absorption dependence at the different operational speed independently of its size and design speed. In order to simplify the definition of Marine Power Plant Economy (MPPE) it’s suitable to introduce the new technical term, new at least for the domestic ships theory and practice. In the domestic professional literature we name it “usklađivanje” which we use to define possibility of fixed pitch regulation in such way to make it capable to absorb all available main engine power. In the German professional literature is named “anpasung fixed pitch propeller and haupt machine“ /1/. German colleagues use more adequate definition of this technical term “anpasung fixed pitch propeller and haupt machine“ in such way that the ship is consuming minimum fuel per sailed mille. In the English professional literature probably named “adjusting” fixed pitch propeller and main engine in such way to minimize the fuel consumption. On up to date technological level enables MPPE to be achieved either by installing adequate CPP or installing the diesel electric power plant. In the first case the controlling of the MPPE is achieved by the adequate controlling of the propeller pitch, while in second case controlling of MPPE is achieved by the adequate controlling propeller rotational speed by means of frequency voltage converter. It seems that the second alternative has lower purchasing cost and more over offers many other advantages which are mentioned in this paper.
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2. Chapman L.B., “The marine power plant”, McGraw-Hill Book Company, Inc, New York and London, 1942.
3. Buxton I.L., Logan J.A. “The ballast performance of ships with particular reference to bulk carriers”, Transactions RINA, Volume 129, 1987.
4. Gallin C., Hiersig H., Heiderich O., “Ships and their propulsion system”, Lohmann&Stolterfoht Gmbh, Witten – West Germany