i * 



Meridian Plane 



i t 



Figure 2 - Equivalent Body of Revolution with Displacement Thickness 

 where A* is the displacement area. Substituting 



r = r + V cos a 



in Equation [10] gives 



, * w 



+ yrj' + 2 A* cos a 



cos a 

 Over the forward part of the body where S « r^ , a reduces to 



[11] 



[12] 



[13] 



which is tlie displacement thickness for two-dimensional flow. In the wake where r^ = 0, 

 Equation [12] reduces to 



a*- \^ [14] 



