52 



Buoyant Cable- 



Plgure 4o - Fouling of Buoyant Cable and Floats 



Throughout the speed range up to about 4.5 knots, all floats towed 

 submerged. The TMB floats were observed to be about k Inches below the water 

 surface. Above 4.5 knots, the TMB floats were closer to the surface and, at 

 the highest speed of 5-25 knots, were towing on the surface. By interpola- 

 tion on either Figure 10 on Figure 25, with an allowance for a slight decrease 

 in load on the float due to the lift forces on the cable loop, it can be seen 

 that the speed of "planing" observed during the field tests checks the model- 

 basin observations. The seven cylindrical floats remained submerged through- 

 out the day's testing. During the tests at high speed, it was possible to 

 take observations of the shape of the loop by sighting on the TMB floats, all 

 of which were visible. Such observations were not possible with the NMWTS 

 floats, which remained submerged for reasons already discussed. 



