Savitsky 3 Roper 3 and Benen 



decreasing the beam, but this step also lessens the impact force, and 

 so one might be better off. Is it worthwhile ? How much is it worth- 

 while ? The answer is not easy, of course, but such type of problems 

 - so called trade-off problems - are not treated. The computer tech- 

 nique is in hand for coping very nicely with such problems and it is 

 feasible to set up a programme that would yield a design, by satisfy- 

 ing in an optimum manner an imposed set of trade-off criteria. There- 

 fore I humbly suggest that the authors, having been successful so far, 

 should continue their quest for further success by applying themsel- 

 ves to this step. 



DISCUSSION 



Reuven Leopold 



U.S. Navy. Naval Ship Engineering Center 

 Hyattsville 3 Maryland^ U.S.A. 



The importance of high endurance, and hence low resistance, 

 at low -about 12 knots- cruising speeds is emphasised. Certainly a 

 broad transom will have an adverse effect on resistance at these low 

 speeds. This point is not discussed in the paper. Was the possibility 

 of incorporating a method of trim control in a design to reduce or 

 eliminate transom immersion at low cruising speeds considered in 

 this design methodology ? 



REPLY TO DISCUSSION 



Daniel Savitsky 



Stevens Institute of Technology 

 Hoboken 3 New Jersey 3 U.S.A. 



Yes. Deliberate trim control was considered, but it is not 

 presented here. 



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