Abstract
When developing new engines, it is always an important subject for designers to realize lightweight and compactness while ensuring required performance and reliability of engines. Factors which contribute to the lightweight and compactness of engines are considered to roughly be classified into two. One is a factor related to engine particulars and the other is a factor related to engine structure.Once the authors proposed a method of estimating engine weight using numerical formulas into which related principal particulars were incorporated to this society.This paper reported the results of analysis on the degree of contribution of the above-mentioned two factors by this method paying attention to actual data on the realization of the lightweight and compactness of two-stroke low-speed marine diesel engines which have been developed to date.These results of analysis are considered to become useful references for establishing the target values of lightweight and compactness when new engines are developed in future.
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