double-armor cable. The fairing was assumed to be weightless 

 in water. Other assumptions are noted in Figure 1. 



Significant advantages in the use of faired cable for 

 achieving the 5000-foot depth are apparent in Figure 1. 

 From the minimum value, 42 x 10~^ sec^/ft for r^ , the minimum 

 allowable diameter of faired cable may be determined, once 

 the highest desired towing speed is selected. The curves 

 show that if unfair ed cable of the same diameter were employed 

 for the same requirements of depth and speed, more than twice 

 the length of cable would have to be used. Moreover, the 

 required downforce at the lower end would be about double 

 that required for the faired cable. For these reasons, and 

 because of the greater cable- life expectancy attributable to 

 fairing, faired cable was selected for this design, in spite 

 of the additional handling problems and increased costs. 



21 



