Goodrich 



0-10 



ooa 



0-06 



0-04 - 



0-02 - 



200 



400 600 



SHIP LENGTH (Pt) 



600 



1.000 



Fig. 11 - Curves of freeboard ratio for 

 constant probability of wetness 0.80 C„ 



REFERENCES 



1. Newton, R. N., "Wetness Related to Freeboard and Flare," Royal Institution 

 of Naval Architects, Vol. 102, 1960. 



Vossers, G., Swaan, W. A., and Rijken, H., "Experiments with Series 60 

 Models in Waves," Society of Naval Architects & Marine Engineers, Vol. 

 1960. 



68, 



DISCUSSION 



E. V. Lewis 



Webb Institute of Naval Architecture 



Glen Cove, Long Island, New York 



This paper shows how available techniques for predicting ship behavior in 

 any particular sea condition— as described in my own paper— can be significantly 

 extended by considering representative sea spectra of different levels of severity. 

 Then, with the help of probability theory, long-term predictions can be made of 

 quantities such as frequency of deck immersion forward. This approach provides 

 a rational basis for establishing standards of bow freeboard. 



606 



