For the case of an unfaired cable, as a result of equation 
(10), 9, is a function only of the ratio y. The functional 
relationship for a cable having positive weight in water is: 
———<—— ——= 
W + 
con 9, * - oR + y (oz) +1 (23) 
It can be seen that if 95 = 9c then the cable will remain 
in a straight line regardless of the value of the tension, 
T,, applied at the bottom. If 99 < 9, then the cable will 
be curved concave upward. If 99 > 9, then the configuration 
will be concave downward. It may be further noted that the 
angle, 9,, at the bottom end of the cable is determined only 
by the ratio of down force, L,, to the drag, D, . Thus: 
Qo = arctan Lo (12) 
Do 
As previously noted, this discussion will be restricted 
to the cases where 95 2 9, - 
As a result of equations (2) and (9) we can now specify 
W 
the value of R and, hence, the critical angle in terms of 
stream velocity and the diameter of the cable. Thus: 
ma us 
16 
