Wave Excitationless Ships Forms 



Fig. 10 - Geometry of fin 

 type models 



= 12.5 cm b = B ■ 15 cm 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 f'o'Or 



Fig. 11 - Heaving force of fin type models 



It will be interesting to bring the resonant frequency equal to o.^. However, this 

 is proved not to be practicable for the following reason: 



resonant frequency of heaving = oj^ 



where m is the mass of a body. 



excitationless frequency = a;. = 



/pgA 

 y m + m^ 



TsPgA 



Tim, 



(7) 



(8) 



As the ratio 73/71 is almost equal to unity, a;^ cannot be equal to a)^ unless the 

 mass of the body is zero. 



393 



