A General Theory for Marine Propellers 



r/R 



0.5 



0.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40 

 r tan /3p 



Fig. 5 - Comparison of the pitch :.r 



distribution from the present de- 

 sign program and Cheng's data 

 from Table 1 of Ref. 6 



where r^^ is the nondimensional hub radius. N times M is taken to be the same 

 as the number of control points on the propeller blade, so that N corresponds to 

 the number J of control points on each blade section and M to the number K of 

 sections on the propeller blade. 



Establishing for each control point P(r,^,^j ) the angle of the tangent to the 

 cambered surface, we obtain according to Eq. (82c) 



119 



