in use. For these cables the weight in water per 
unit length and the breaking strength are propor= 
tional to the square of the diameter. These 
relations are: 
w= 210 ae a? (2) 
ibs 
£t? 
' 
Taax * L-15 x 107 ao (3) 
The cable tension at the water surface, T, , 
will be assumed to be limited to 1/3 of the 
rated breaking strength. Thus: 
lbs 
£t? 
T, (design) = 3.84 x 10° a? (4) 
This safety factor of 3 is employed to take ac- 
count of inertial loads due to motion of the tow 
point, and the reduction of cable strength due 
to corrosion and fatigue. Actually, in a conser- 
vative design, this factor ahoata probably be as 
much as 4 or 5. 
The cable angle at the bottom, 9, is assumed to 
be 90 degrees. This means that the drag, Dy, of 
any body attached to the cable is assumed to be 
tla 
