Davis and Zarnick 



.2 .3 .4 .5 .6 



Frequency in cycles per second 



.7 .8 .9 



Fig. 9 - Heave /pitch ratio for Model 4941 at zero 

 speed in head waves; transient test compared with 

 regular wave test results 



'0 .2 .4 .6 .8 1.0 



Frequency in cycles per second 



Fig. 10 - Pitch response for Model 4941 

 in heave waves at a Froude number of 

 0.09; transient test compared with regu- 

 lar wave test results 



520 



