Q Torque 



R Propeller radius 



R Reynolds number 

 n 



r,8,x Cylindrical coordinate system defined in Figure 1 



r Hub radius divided by the propeller radius 

 H 



T Thrust 



u m Tangential component of perturbation velocity caused by source 

 distribution 



V Speed of advance: V (1-w) 



V Ship speed 



s 



w Wake fraction 



x,y,z Local rectangular coordinate system 



Z Blade number 



a Angle of attack of blade section 



3 Geometric pitch angle 



3 . Hydrodynamic pitch angle 



T Strength of nondimensional circulation 



6 Quantity defined by Equation (14) 



n Propeller efficiency 



X r tan 3 . 



£,n,C; Local rectangular, coordinate system 



P,4>,£ Cylindrical coordinate system defined in Figure 1 



p Mass density of water 



Cavitation number 



oo Angular speed 



