3. According to the unified slender-body theory it should be valid for all 

 frequencies. However, for large frequencies, the motion results become unacceptably 

 large. This may be caused by the use of a different method for the solution of the 

 strip theory. 



4. Because of the above mentioned discrepancies, until further research 

 mentioned in items 1 and 2 are carried out, the application of the unified slender- 

 body theory to improve the prediction of motion of SWATH ships is not recommended. 



ACKNOWLEDGMENTS 

 The author expresses his thanks to Dr. CM. Lee for his useful advice and 

 gratefully acknowledges the support of Ms. M.D. Ochi. 



47 



