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(Block 20 continued) 



is discussed together with influences of neighboring cavities on cavity 

 drag, the hydrodynamic pitch angle, inflow retardation and the optimum 

 pitch distribution of the propeller. 



The computer program developed here is applied to several existing 

 propeller models. The results show that propeller efficiency is pre- 

 dicted well but pitch distribution is a little larger than for the model. 

 The results are analyzed and compared with the results of a lifting- 

 surface design method which has been developed recently for use with the 

 present preliminary design method. 



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I 



