Wave Analysis Techniques to Achieve Bow-Wave Reduction 



1.0 

 Lrr,l 



0.9 



oa 



0.7 



Exact theoretical curve 

 by direct computation 



With semi-empirical 

 corrections after Inui 

 and author, see Ref. 4 



Q Prom analysis of 

 ^ five transverse 



C outs, see Bef. 4 



Prom analysis of a 

 single longitudinal 

 C cut (present work) 



1S.0 [m-'j 



Fig. 8 - Amplitude spectrum of Ihuid 

 S-201 for 7o = 4.9 or F^ = 0.319 



the same experience has been made previously with the transverse-cut method 

 where as many as five cuts had to be taken (instead of a theoretical minimum 

 requirement of only two cuts) to reduce the mean error to less than 5 percent 

 (see Ref. 5a). 



By the way, this mutual confirmation of the results of transverse- and 

 longitudinal -cut analyses seems to further justify the working definition of wave 

 resistance in a real fluid as the dynamic reaction of the associated free wave 

 system. This quantity does seem to be a significant invariant property of the 

 model not unduly sensitive to an arbitrary choice of parameters selected for 

 analysis. 



CONCLUSIONS 



It seems that a convenient and practical method of wave analysis has now 

 been established. This involves the measurement of a time record of wave 



755 



