Knowing that the rope will be a flattened
strand, the Factor of Safety can be determined
from this plot, also found in the SME Handbook:
k1 = 46.0
k2 = 0.00090
Factor of Safety ~ 8.0
The diameter of the rope is calculated as
follows:
The rope
diameter is rounded up to the nearest
value found in Table 7.1:
Using the value
of 1-3/8 inches, the rope weight will be
3.18 lbs/ft.
Then, the rope strength is equal to:
Rope Strength = k1*d^2 =
(46.0)*(1-3/8)^2 = 87 tons
