Parent hull

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Parent Hull

Similar boats

The parent hull methodology of hull form design uses an existing ships lines plan, with known performance characteristics, to produce a similar or sister ship. The parent hull can is modified (stretched, scaled, etc.) to suit the requirements of the new design vessel, or to correct undesirable qualities in original. The parent hull approach has the advantages of being relatively quick, with relatively predictable results. Care must be taken, however, not to over-generalize the relationships between similar hulls, particularly in regard to stability (i.e, see Ryan's Commander).


Generalized Relationships

Adding Length

Adding Breadth

Adding Draught

Adding Depth

Increasing L/B Ratio

Increasing D/d Ratio

Increasing Prismatic Coefficient

Increasing Block Coefficient

Increasing Midships Coefficient

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