Vogel and Patterson 



40- 



35 



30 



25 



Drag 

 Reduction-gms 



20 



T r 



"T r 



25mm. Nose 



30 ml/sec. 



23 ml /sec. 



100 200 300 400 500 600 700 



Tunnel velocily - cm/sec. 



Fig. 14 - Drag reduction vs polymer injection 

 flow for 500 ppm. POLYOX WSR-301 



