the effective displacement thickness were computed along the major elliptic axis 

 meridian for locations greater than 81 percent of the body length. A careful hand- 

 fairing was used to define the effective displacement thickness along the major 

 axis meridian. 



COMPARISON OF EXPERIMENTAL AND THEORETICAL RESULTS 

 All data are presented in the coordinate system used to experimentally measure 

 the boundary-layer flow. The coordinate system, denoted x - n - 9, is given in 

 Figures 1 and 4. The axial coordinate x is measured from the nose of the body and 

 passes through the center of the elliptic profile. The coordinates n and are 

 defined along an axial cut normal to the x-axis, i.e., in the y-z plane. The 

 normal component n is measured from the model surface and is normal to the elliptic 

 surface. The angular coordinate 9 is defined as the angle, in degrees, measured 

 from the z-axis to the line joining the surface offset and elliptic center. 



PRESSURE DISTRIBUTION 



The steady pressure was measured along the stern surface using pressure taps. 

 These taps are located at nine axial and five radial positions, for a total of 45 

 measurements. The pressure coefficient C is computed from the measured pressures 

 by the relationship 



P-P- P-P_ 



C = ^ = -. ^ (4) 



P Pt-Ps 4 pU 2 



where p = measured local static pressure 



p = measured ambient pressure 

 o 



p = measured dynamic total pressure 



p = measured static pressure 

 s 



p = mass density of the fluid 



U = free- stream velocity 

 o 



The measured values of the pressure coefficients are given in Table 2 and com- 

 pared in Figure 6 with two analytically-predicted distributions of pressure 



10 



