"Wire rope" is also a technical term used in the rigging industry.
It covers all forms of steel cable that have been discussed in this
email thread, including "aircraft cable".
Choosing a wire rope design for cranking up/down a tower is different
from choosing a wire rope design for guying a fixed tower. These are
different applications that have different requirements. Choosing the
right wire rope for cranking up a tower involves a lot more tradeoffs
(rope material, sheave material, sheave diameter and cross-sectional
shape, rope construction, rope core choice, etc). The tower
manufacturer's engineering team should have evaluated these trade-offs
in selecting the type of wire rope used in a specific tower. Why second
Guy cable does not need to bend and straighten as it passes around
the sheaves of pulleys.
W3YY reported he has used aircraft cable for guy wires. Sure, it's
possible. But that's not what aircraft cable was designed for. One can
use needlenose pliers to punch a hole in the top of a paint can, too...
or a screwdriver to chisel out some wood. But aircraft cable IS more
stretchy than 7-strand wire rope under load. That extra stretch may not
be a problem at one installation, but could be a problem at another.
K7LXC's prime directive applies.
on 07 Mar 14 09:44 K7LXC@aol.com said the following:
> In a message dated 3/14/2007 4:36:06 A.M. Pacific Daylight Time,
> firstname.lastname@example.org writes:
>> My understanding is that EHS is "galvanized steel cable", which is not the
> same as wire rope.
> Rope is "a strong, thick line or cord, commonly one composed of twisted
> or braided strands of hemp, flax, or the like, or of wire or other
> And technically, it's only cordage above one inch in circumference and below
> 10 (bigger-around than that is a cable).
> Wire rope is a generic term used to describe just what it is. In amateur
> circles we tend to use several different terms for the same thing; e.g. guy
> wires, guy cables, etc.
>> While they might have the same breaking strength, other
> characteristics may be quite different, such as abrasion resistance.
> Umm, I'm not sure about the abrasion resistance but each wire rope is
> characterized by the material, its lay (either right or left), the number of
> strands and the number of strand bundles that make up the completed wire
> most crank-ups use 7x19 wire rope because all of the small strands make it
> easily bendable and flexible so it can pass over pulleys many times without
>> Rohn specs call for EHS, not wire rope. I wouldn't fool around with
> other than what the spec calls for.
> Yep - the LXC Prime Directive still applies: DO what the manufacturer says.
> BTW there are 7-8 different grades of wire rope for a given size; e.g.
> 1/4" - galvanized, utility grade, stainless steel, EHS, etc. - and it's
> important to use the right grips with the right wire rope. They are NOT
> Steve K7LXC
> TOWER TECH
TowerTalk mailing list