Titoff, Russetsky, and Georgiyevskaya 



3. Russetsky, A. A., "Hydrodynamics of Controllable -Pitch Propellers," 

 Sudostroyenie Publishers, 1968 



4, Georgiyevskaya, E.P,, "Erosion on Propellers of Hydrofoil Passenger 

 Ships," J. Sudostroyenie, No. 7, 1966 



DISCUSSION 



C.G. Cox 



The authors have earned the appreciation of those concerned with the design 

 of propellers for high-speed applications. They do not neglect to indicate where 

 the state of the art lies today, and describe logically-derived, empirical ap- 

 proaches to allow for those aspects of design procedure which cannot, as yet, be 

 mathematically determined with precision. They draw attention to the design 

 problem caused by high shaft inclinations— a common feature of many high- 

 speed craft. Anyone who has observed the severe root erosion that can be 

 caused by large flow inclinations has no doubt as to the severity of the problem. 

 If possible, such propellers should always be designed and tested to allow for 

 this effect. 



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