van Manen, Oosterveld and Witte 



Fig. 1 - Arrangement of propeller 

 in nozzle for a tanker model 



model as suggested by the authors is shown. Figure 2, shows the bow and stern 

 thruster fitted to the model. 



The draft, propeller diameter, efficiency, propeller cavitation, propeller- 

 induced vibration, construction of the rudder and so on, are all design factors, 

 influenced favourably by the solution indicated by Figs. 1 and 2. To obtain a 

 comparison between the propulsive performance and the manoeuvrability of a 

 tanker with a conventional stern arrangement and the one according to Figs. 1 

 and 2, tests were carried out with models representing a 90,000-ton deadweight 

 tanker. The results of these experiments are presented and discussed in this 

 paper. 



REGULATING VALVE 



PUMP 



MOTOR 



WATER INTAKE 



Tf i\ n 



Fig. 2 - Bow and stern thruster arrangements fitted to the model 



240 



