Vassilopoulos and Mandel 



-2 0.8 

 ho 



0.6 

 0.4 

 0.2 

 0.0 



0.6 



0.9 



1.2 

 X/L 



+150 

 + 100 

 + 50 S 



UJ 



a: 

 "^ 



Q 



-50^ 



-100 



-150 



1.5 



Fig, 31 - Model D in directly astern seas, heaving 

 non-dimensional amplitude and phase angle vs 

 wavelength to shiplength ratio 



288 



