17 



l/3-Scale Model Buoy 2 without Bail 



l/3-Scale Model Buoy 2 with Bail 



Reynolds Number x I0 5 



Figure 19 - Drag Coefficient Versus Reynolds Number for 

 Various Buoy Models 



C D 



JTv^a 



where D is the drag of the buoy in pounds, 



p is the density of the water in slugs per cubic foot, 



A Is the maximum projected area of the buoy into a plane normal to the 



flow, in square feet, and 

 V is the towing speed in feet per second. 



The Reynolds number is defined as 



R 



U 

 v 



where V Is the towing speed in feet per second, 

 d is the maximum diameter of the buoy, and 

 v is the kinematic viscosity in feet 2 per second. 



