Vassilopoulos and Mandel 



+150 

 + 100 

 + 50 S 



UJ 

 Q 



50 



-100 



50 



0.6 Q9 



1.2 

 X/L 



1.8 



1.6 

 1.4 

 1.2 



1.0 



0.6 

 0.4 

 0.2 

 0.0 



0.6 



0.9 



1.2 

 X/L 



+ 50 UJ 



UJ 



cr 

 ^ 



Ll) 

 Q 



- 50 ~ 

 ■K- 



-100 

 -150 



Fig. 49 - Model F in directly astern seas, pitching 

 non-dinnensional amplitude and phase angle vs 

 wavelength to shiplength ratio 



306 



