JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN

This paper describes the application of a engine total electronic control system for marine engines. This system makes it possible to control engine performance according to the operation conditions. First, concept and structure of such a system are discussed as a feasibility study. Second, results of tests to confirm the functions of electronic controlled fuel injection and exhaust valve systems are introduced.

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This paper is concerned with the influence of hull elongation on engine and propulsive performance. Though propulsive performance is known to relate closely to the principle dimensions of a ship, it is not yet clear how ship length can influence the performance of CPP (controllable pitch propeller) ship and FPP (fixed pitch propeller) ship, both of which have the same breadth and depth. Sailing performance under two different conditions (before and after elongation) was examined using an actual ship equipped with CPP. The results obtained from this examination are as follows : (1) engine output increases after hull elongation at the same ship speed as before elongation, and the tendency becomes stronger at higher speeds ; (2) the total resistance coefficient increases after elongation at the same Froude number Fr as before elongation in Fr ≥ 0.22, but it is the same value at before and after elongation in Fr<0.22; (3) the propulsive efficiency increases after elongation at the same Froude number as before elongation in the constant revolution characteristic.

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