High-Speed Planing Hull for Rough Water 



DISCUSSION 



Reuven Leopold 



U.S. Navy. Naval Ship Engineering Center 



Hyattsville, Maryland, U.S.A. 



The requirement to achieve 45 knots in state 3 seas is empha- 

 sized. However the effects of air drag and sea state on the power re- 

 quired to propel the craft at 45 knots is not discussed. Assuming that 

 a state 3 sea is generated by a 15 knot wind, how much is the calm 

 water kn. relative wind resistance of the craft at 45 knots increas- 

 ed by the presence of a 60 knot relative wind and a state 3 sea ? 



REPLY TO DISCUSSION 



Daniel Savitsky 



Stevens Institute of Technology 

 Hoboken, New Jersey } U.S.A. 



It is important to emphasize that the present paper presents a 

 methodology for rational design of planing hulls. The method has been 

 applied to a particular set of design parameters to demonstrate its 

 validity. It now remains to use this technique to develop optimum de- 

 signs as suggested by Dr. Saint-Denis and Dr. Leopold. 



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