Ship Maneuvering in Deep and Confined Waters 



A simple guide to ship resistance values may be obtained 

 from the mean line of Fig. 16 , which summarizes the results of a 

 limited number of SSPA trial trip data in terms of the total specific 

 resistance R/A = - [ X"] . _. on basis of Froude number F^l or 

 u". (A similar plot of "total resistance in lbs to displacement in 

 long tons" versus Taylor speed-length quotient, based on model data, 

 was published by Saunders, [ 53] .) The mean line also reflects the 

 general trend of the resistance-speed-dependence for the individual 

 ships in the proximities of their design speeds. 



10-3 X 

 10 



= -[ X"ly^r = 



Black circles relate to full speedy 

 open circles to lower speeds 

 at same trial 



/ 



o-» 



y 



010 



020 



0.30 F, 



nL 



Fig. 16. Specific resistance figures as evaluated from ship trial 

 data at SSPA. 



849 



