Goodrich 



Fig. la - Response curves for 

 constant k/h 0.70 C„ 



0-1 0=15 020 oas" 



FROUDE NUMBER 



X 



5-0 



4-0 



3-0 



2-0 



1-0 



Fig. lb - Response curves for constant 

 speed 0.70Cg 



MODEL DATA 



The most systematic model data available at present are those of Vossers 

 and Swaan [2] and these have been used in the present analysis. Measurements 

 were made of the relative bow motions of a series of models and the response 

 curves presented as the ratio of the relative bow motion to wave height on a base 

 of block coefficient and for a range of speeds. Cross curves have been derived 

 of the relative bow motion to wave height ratio for constant wave lengths to a 

 base of Froude Number. Some account has been taken of the loss in speed due 

 to wave action by assuming a loss in speed curve for each model. The responses 

 have then been obtained from the cross curves for the speed corresponding to the 

 particular Beaufort scale being considered. Typical response curves are given 

 in Figs, la and lb for the 0.70 Cr form. 



598 



