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1 Polish Maritime Research

1 2001

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On the power prediction methods in the preliminary ship design stage

Jarzyna H., Tuszkowska T.

Polish Maritime Research

2001

Vol. 8, nr 3

3-7

The ITTC-78 power prediction method can by divided into three groups of procedures: RTS- procedures, TBS- procedures and the QBS- procedures. Only the QBS- procedures are analyzed in this paper. A new approach to the determination of QBS and nS parameters is proposed. Outline of the new methods is briefly presented. The new idea of equivalent open propeller is the basic difference between the ITTCQ BS- procedures and the Q BS-JH - procedures. The aim of this approach is to reduce the number of parameters needed to be corrected due to the scale effect and to generate a situation where the Q BS, n S and V TS parameters are of unique value independent of the subjective choice of averaging criteria.