RECOMMENDATIONS 

 Based on the investigations made in the present work, the following studies 

 are recommended in order to further improve the current prediction method : 



1. The improved-accuracy, tip-flow part of the PSF should be used for the 

 prediction of the pressure distribution near the tip region. The tip flow is very 

 complicated and of practical importance, and yet the prediction near the tip region 

 is not as good as that for the inner region. Since the tip flow model contains 



a finer lattice arrangement than does the global flow model, the tip flow solution 

 is expected to give more accurate results. The modification to the tip flow part 

 for pressure calculations is straightforward. 



2. In order to be able to predict viscous phenomena such as suction-side 

 separation or leading-edge laminar bubble separation that is frequently observed 



in experiments with model propellers, suitable analytical and numerical analysis 



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 should be undertaken. Some initial efforts in this area have been undertaken. 



3. In order to further assess the validity and limitation of the current 

 procedure, comparative calculations are recommended with other theories for a 

 wide range of propellers and operating conditions. 



4. Parametric calculations of propeller characteristics of practical 

 importance such as cavitation inception, boundary layer development, and blade 

 stress should be undertaken. 



ACKNOWLEDGMENT 

 The authors are very grateful to Dr. Terry Brockett of DTNSRDC for many 

 helpful comments and criticisms during the preparation of this report. 



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