Unconventional Propulsion — Silverleaf 



Resultant velocity of propeller or rotor blade from 

 ahead and rotational components 



Wake fraction (Taylor) 



Displacement 



Overall propulsive efficiency 



Quasi -propulsive efficiency or coefficient 



Qualified quasi -propulsive efficiency or coefficient 



Hull interaction factor 



Ideal jet efficiency 



Real jet efficiency 



Qualified overall propulsive efficiency 



Hydraulic efficiency of propeller or pump 



Ducting loss factor :;■ ;. • - ; 



Transmission efficiency - -- 



Thrust efficiency of propulsion device 



Mass density of fluid 



Cavitation index based on ahead velocity of propulsion 

 device 



^ ^ (^p.p y^Vj,^ Cavitation index based on resultant velocity of rotor 



"" ' blade 



REFERENCES 



1. Hadler, J.B., Morgan, W.B., and Meyers, K.A., Advanced Propeller Propul- 

 sion for High-Powered Single-Screw Ships. Trans. SNAME 1964, Vol. 72, 

 p. 231. 



2. Thurston, S. and Amsler, R.C., A Review of Marine Propulsive Devices. 

 Am. Inst. Aero. & Astro. Second Annual Meeting, July, 1965. 



3. Brandau, J.H., Aspects of Performance Evaluation of Water jet Propulsion 

 Systems and a Critical Review of the State-of-the-Art. AIAA-SNAME Ad- 

 vance Marine Vehicles Meeting, May, 1967. 



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