A General Theory for Marine Propellers 



9. It is planned to extend the theory to take the thickness effect into account. 

 Super cavitating propellers with arbitrary blade contours and arbitrary a values 

 will also be investigated. 



10. The effect of viscosity has been ignored in the present work. However 

 since the theory can accurately predict the load distribution along various chords, 

 it paves the way for investigating the effect of viscosity. 



11. Preliminary results have indicated that an efficient computer program 

 can be developed on the basis of the numerical technique discussed in the paper. 



ACKNOWLEDGMENT 



This work was carried out under the Naval Ship Research and Development 

 Center Foundation Research Project. 



The authors express their thanks to Mr. J. B. Hadler, Head of the Ship 

 Powering Division, NSRDC, for his encouragement and support. Thanks are due 

 to Mr. H. M. Cheng and Dr. B. Yim for their interest and many stimulating dis- 

 cussions in the development of the basic concept of the theory. 



REFERENCES 



1. Sparenberg, J. A., "Application of Lifting Surface Theory to Ship Screws," 

 International Shipbuilding Progress 7 (No. 67), 99-106 (1960) 



2. Cox, G.G., "Corrections to the Camber of Constant Pitch Propellers," 

 Royal Inst. Naval Architects 103, 227-243 (1961) 



3. Pien, P.C., "The Calculation of Marine Propellers Based On Lifting- Surface 

 Theory," J. Ship Research 5^ (No. 2), 1-14 (1961) 



4. Kerwin, J.E., "The Solution of Propeller Lifting- Surface Problems by Vor- 

 tex Lattice Methods," Massachusetts Institute of Technology, Dept. of Naval 

 Architecture and Marine Engineering, June 1961 



5. Lerbs, H.W., Alef, W., and Albrecht, K., "Numerische Auswertungen zur 

 Theorie der Tragenden Flache von Propellern," Jahrbuch der Schiffbau- 

 technische Gesellschaft 58, 295-318 (1964) 



6. Cheng, H.M., "Hydrodynamic Aspect of Propeller Design Based on Lifting 

 Surface Theory, Part I— Uniform Chordwise Load Distribution," David 

 Taylor Model Basin Report 1802, 1964. 



7. Cheng, H.M., "Hydrodynamic Aspect of Propeller Design Based on Lifting 

 Surface Theory, Part II— Arbitrary Chordwise Load Distribution," David 

 Taylor Model Basin Report 1803, 1965 



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