Newman 



10° DRIFT ANGLE (STERN TOWARD CAMERA) 



3° DRIFT ANGLE 



ZERO DRIFT ANGLE 



-3° DRIFT ANGLE 



Fig, 1 - Side view of MARINER hull in the 

 circulating water channel showing the flow 

 pattern at various drift angles (model length 

 12.6 ft, nnodel speed 3,1 knots) 



further downstream the entire cross -flow perturbation is in the expected direc- 

 tion, so that the growth in thickness with distance downstream does not occur, 



A pronounced asymmetry of the free surface can be detected in the vicinity 

 of station 16 (Fig, 1). In the straight condition (zero drift angle) there is a wave 

 trough centered between stations 15 and 16, In the yawed condition this wave 

 disappears on the downstream side of the hull (bottom photograph) but increases 

 slightly and moves aft to station 17 on the upstream side. 



206 



