Vassilopoulos and Mandel 



1.6 

 1.4 

 1.2 

 1.0 

 .rr^O.e 

 0.6 

 0.4 

 0.2 

 0.0 



kh 



0.6 



0.9 



1.2 

 X/L 



+150 



+ 100 



+ 50 S 

 u 



Q 



- 50*^ 



-100 



-150 



1.5 



1.8 



1.6 



1.4 



1.2 



1.0 



^0.8 

 kho 



0.6 



0.4 



0.2 



0.0 



0.6 



0.9 



1.2 

 X/L 



+150 

 + 100 

 + 5oS 



UJ 



cc 

 ^ 



LlJ 

 Q 



- 50^ 



-100 



-150 



Fig, 53 - Model G in directly ahead seas, pitching 

 non-dimensional amplitude and phase angle vs 

 ■wavelength to shiplength ratio 



310 



