S Wetted surface 



s As index, symmetry 



U Speed of advance 



x Longitudinal coordinate 



x Longitudinal distance of centroid 



y Ordinate of the meridian contour 



77 Dimensionless ordinate of the sectional-area curve 



77 77. Dimensionless ordinate of the sectional-area curve 

 fore and after body 



7j 77 Dimensionless ordinate of the sectional-area curve 

 s a even and odd part 



9 Variable of integration 



n(x),H*{$) Doublet distribution 



£ Dimensionless longitudinal coordinate 



A Dimensionless longitudinal distance of centroid 



P Density 



ff(x), <?*($) Source-sink distribution 



<j>. Prismatic coefficient; afterbody 



<j>„ Prismatic coefficient; forebody 



