Wave Excitationless Ships Forms 

 -K„T 



and the authors' theory: 



k; = 



Aje 



Ve 



-K„F 



0^ • V 



(5) 



we know Kg is less than Kg and Kg . 



Mr. Milgram has shown that Eq. (5) agreed very 

 well with measured one. In fact, in case of three di- 

 mensional problem where V is sufficiently large, and 

 the inertia coefficient is not so large, Eq. (5) will give 

 considerably reasonable value. However, if -l (the 

 height of the submerged cylinder) becomes zero (thin 

 collar piece), Eq. (5) will give K - oo with V -► 0. On the 

 other hand, since k^v does not become zero when V 

 tends to zero, Eq. (4) and Eq. (6) will give finite K 

 value. 



Therefore simplified Eq. (5) will result in consid- 

 erably higher value of excitationless frequency when 

 the underwater bulb is flattened. 



(6) 



Sketch 3 



413 



