Lindgren, Johnsson and Dyne 



z = number of blades 



a = scale factor 



aj) = angle between nose-tail line of duct profile and propeller shaft 



r = circulation ::'>.>:.'j:. ' 



7} = propulsive coefficient 



Vq = open water efficiency 



Tjfj = hull efficiency 



Vr = relative rotative efficiency 



P = mass density of water . : 



_ p 



= cavitation number 



REFERENCES 



1. Lindgren, H., Bjarne, E., "The SSPA Standard Propeller Family. Open 

 Water Characteristics," Publ. No. 60 of the Swedish State Shipbuilding Ex- 

 perimental Tank, GOteborg, 1967. 



2. Hadler, J.B., Morgan, W.B., Meyers, K.A., "Advanced Propeller Propulsion 

 for High-Powered Single-Screw Ships," Trans. SNAME, Vol. 72, pp. 231-293 

 (1964). 



3. Pien, P.C., Strom-Tejsen, J., "A Proposed new Stern Arrangement, " Naval 

 Research and Development Center, Report 2410 (1967). 



4. Lindgren, H., "Hydrodynamiska aspekter pa motroterande propellrar, " The 

 Swedish State Shipbuilding Experimental Tank (SSPA), General Report 24 



1302 



