The maxixniuii cable curvature occurs at the depressor and 

 is given very nearly by 



C =« R/T , 

 o o 



viiere Tq is the force imposed on the cable by the depressor 

 and R, the resistance experienced by a unit length of the 

 towline v*ien caused to move at V, some steady velocity rela- 

 tive to a fluid, along a path normal to the axis of rotational 

 symmetry of the cable. The value of Cq at a speed of 7% knots 

 is about 1/1680 feet. Since the approximate value of E is 

 72.000 Ib/ft^ , and of I, ia~*ft*, the contribution due to 

 bending is, at raost 



L„ = 10~* ft* X 72 X 10® Ib-ft-^ X (1680 ft)-^ 



» 2.55 X 10""' ft-lb/ft 



The contribution due to the externally imposed loads is, 

 at most, that corresponding to the maximum load (500 pounds) 

 \»*iich can be carried by the stops. Since this load is carried 

 almost exclusively in the Dacron cording, we may estimate y 

 to be nearly equal to the radius of the cable, hence: 



L^ = TC^y 2J SCO lb X (1,680 ft)-^ X ^^jp ft 

 = 9.3 X 10-° ft-lb/ft , 



which is approximately 3 x 10* L_. 



I '14 



