Vassilopoulos and Mandel 



1.6 



1.4 



1.2 



1.0 



^0.8 

 kho 

 0.6 



0.4 



0.2 



0.0 



+150 



+ 100 

 + 50 S 



UJ 



a. 



^ 



o 



-50* 



-100 



-150 



0.6 



0.9 



1.2 

 X/L 



+150 



+ 100 



+ 5oS 



iij 



oc 



13 



lu 



Q 



- 50 ~ 



-100 



-150 



0.6 



0.9 



1.2 

 X/L 



Fig. 5 - Model A in directly ahead seas, pitching 

 non-dimensional annplitude and phase angle vs 

 wavelength to shiplength ratio 



262 



