Uram and Numata 



2 10 



0.5 



1.5 



0.5 



0.5 1.0 1.5 2.0 



WAVE LENGTH/ MODEL LENGTH L_/L 



2.5 



Fig. 18 - Shark form motions 



Shark Form motion behavior with varying wave length in following regular 

 seas, obtained at Massachusetts Institute of Technology, over a very limited 

 speed range, to about 10 knots (F = 0.30) is given in Fig. 18. Although, as 

 Mandel points out, the behavior for F = 0.1 is suspect, the behavior at the other 

 Froude numbers gives insight as to influence of wave length on the motions for a 

 given operating speed. 



The pitch response of the Hydrofoil Semi -Sub marine in 1.0 L and 2.0 L regu- 

 lar waves is presented in Figs. 19 and 20, while the heave response is given in 



738 



