Panel Discussion 



The calculated water line is shown in Figs. 5 and 6, The model was built in the 

 Netherlands Ship Model Basin, with its body plane shown in Fig. 7. The results 

 are shown in Figs. 8 and 9 in scales of CGS and feet- pound, respectively. The 

 plottings of EHP (test)/EHP (Taylor) for the ship model with and without bulb 

 are shown in Fig. 10. At the design point of F = 0.3 , it is seen that a reduction 

 in EHP of almost 20% was realized. 



05 10 015 0.20 25 0.30 35 40 0,45 50 



x/L 



Fig. 5 - Waterline of a ship with a cylindrical bulb (tested) 



0.10 



Fig. 6 - "Waterline of a ship with a cylindrical bulb (tested) 



CONCLUSIONS 



The encouraging results of the model tests seems to support the theoretical 

 approach proposed here for reducing ship wave resistance. This approach 

 would be applicable not only to the determination of a good bulbous ship but also 

 to the design of a bulb to an existing ship. K one can find a superposition of 

 elementary sine ships for an existing ship, the optimum bulb for the given ship 

 could be built up of the superposition of optimum bulbs for each elementary 

 ship. 



For the stern of a ship a separate treatment will be necessary. However, if 

 the modification of the stern improves the efficiency of the ship without the bulb, 



1565 



