The aim of this paper is to investigate the effect of the change in structural weight due to optimisation experiments on life-cycle cost and earning elements using the life-cycle cost/earning model, which was developed for structure optimisation. The relation between structural variables and relevant cost/earning elements are explored and discussed in detail. The developed model is restricted to the relevant life-cycle cost and earning elements, namely production cost, periodic maintenance cost, fuel oil cost, operational earning and dismantling earning. Therefore it is important to emphasize here that the cost/earning figure calculated through the developed methodology will not be a full life-cycle cost/earning value for a subject vessel, but will be the relevant life-cycle cost/earning value. As one of the main focuses of this paper is the maintenance/repair issue, the data was collected from a number of ship operators and was solely used for the purpose of regression analysis. An illustrative example for a Chemical Tanker is provided to show the applicability of the proposed approach.

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