Table 6. Drag coefficients. 



Object 



L/d 



Reynolds number 



CD 



Circular cylinder 



en 



10 5 

 10 5 

 10 5 

 >5 x 10 5 



0.63 

 0.74 

 1.20 

 0.33 



Square cylinder 



3.5 x 10 1 * 



10 4 to 10 5 



2.0 



1.6 



Rectangular flat plate 

 ( totally submerged ) 



T 



d 



l 



5 

 20 



>10 c 



>io- 



>10 ; 



>10 ; 



1.1 

 1.2 

 1.5 



2.0 



NOTE.--L = The height of a submerged cylinder, or the length of the 

 flat plate. 



d = The projected dimension shown, or the width of the flat 

 plate. 



178 



