Wave Resistance 



18 20 22 24 26 



V - KNOTS 



Fig. 10 - EHP (test)/EHP (Taylor) for 

 ship models with and without bulbs 



it will be safe in general to expect almost the same amount of improvement due 

 to the stern in the ship with a bulb. 



For ships of higher Froude numbers (f > 0.35) the method of analysis in this 

 report may not be used. It would be rather more appropriate to use a modified 

 slender- ship theory (Yim, 1967 or Maruo, 1962). 



NOTATION 



H is the ship draft in the Michell ship sense, 



L is the ship length, 



m is the source strength per unit area, 



xi is the longitudinal distance aft from the bow nondimensionalized by 



dividing by L , 



zi is the vertical coordinate from the mean free surface nondimen- 



sionalized by dividing by H , 



x,y,z is a rectangular coordinate system with origin on the mean free 



surface, x in the direction of uniform flow at infinity and z positive 

 upward. 



1568 



