Vassilopoulos and Mandel 



1.6 

 1.4 

 1.2 

 1.0 



"o 0.8 — 



0.6 

 0.4 

 0.2 

 0.0 



+150 



+ 100 



+ 50 S 

 lij 



(C 



^ 



^ UJ 



Q 



- 50 

 -100 *^ 

 -150 



0.6 



0.9 



1.2 

 X/L 



1.5 



1.6 

 1.4 

 1.2 

 1.0 



kho 

 .0.6 



0.4 



0.2 



0.0 



0.6 



0.9 



+150 



+ 100 



+ 5oS 



iij 



□: 



^ 



LJ 

 Q 



50 ~ 



* 



-100 u, 



-150 



1.2 

 X/L 



1.5 



Fig. 13 - Model B in directly ahead seas, pitching 

 non-dimensional amplitude and phase angle vs 

 wavelength to shiplength ratio 



270 



