Resistance

Johns "mid section" has nothing to do with hydrodynamics, only the upper structure has!

 

Well, ahh sorry just could'nt resist (!) it..........

 

The rough estimates of the cost of tank tests was very useful. Thank you.

That sounds like sound established practice among older naval architects. It is a good method if you want to design boats that are similar to other boats.

 

Jenny
It is the only way. A good naval architect has a large database of previous designs. When a design is completed and built, sea trails taken, all this data is collected for future use. It is then used to design other vessels, whether similar or not so similar. It gives confidence to the design, and it is not based upon "1's" and "0's", ie pretty computer graphics, which has no validation.

 

I treat all estimates made by computer and experiment as a guide only. For some radical design ideas there are no experimental databases so there is no alternative but to use computer models. With caution of course.

Thanks again.