where r = radius of curvature at the particular axis of interest in the y-z plane, 

 i.e.. 



[-(S)1 



2- 3/2 



y-axis d 3 



dz2 



and 



r 



[- m ] 



2- 3/2 



z-axis d z 



A* = effective displacement area. A* = I (1- 1 rdy 



a = angle between the body surface and the body axis, 

 -1 /Ay\ -1 / Az \ 



r = r + y cos a 

 c 



y = normal distance from the wall 

 Unlike the procedure for an axisymmetric body, which uses an iterative procedure 

 consisting of the calculation of pressure and boundary-layer flow over successive 

 displacement bodies, the present scheme for three-dimensional bodies uses only one 

 iteration. The uncertainties in defining the displacement body in the region between 

 the major and minor axes and in the near-wake region lead one to question the use- 

 fulness of an iterative procedure at present. It is anticipated, however, that once 

 improvements are made in defining the displacement model over the entire body length 

 and in the wake region, an iterative procedure will be adopted again. 



One further obstacle arose in defining the displacement body for the 3:1 trans- 



2 

 verse cross-sectionAl model. Excessive boundary-layer growth in the C K boundary- 

 layer computation caused the computer program to abort prematurely. No values for 



