As the name implies, rotation resistant 19x7 aircraft cable is specifically engineered to combat the twisting forces that are characteristics of other cable constructions. This balance is created during the manufacturing process, which requires a specific series of steps and layers to achieve the perfect cable. Without this cable, single line hoisting applications would not have the stability required to operate safely. Here is a closer look at the science behind non-rotating cable, and how its specialty construction helps keep loads stable during lifting.
A cable’s ability to resist rotational forces simply comes from its construction. When wires are wrapped together to form strands, they are laid in either clockwise or counterclockwise directions, referred to as lay directions. Like small machines, these wires interact with each other and generate torque that causes the cable to twist. In order for a cable to be non-rotating, its various layers must lay in opposite directions to each other to create an equal balance. Here is a brief overview of the manufacturing process that makes this phenomenon possible.
19x7 cables are constructed in layers, starting with a 1x7 core that is wrapped in a layer of six strands. This 7x7 base acts as the foundation for the rest of the cable. Though it can technically lay in either direction, the core in this example will lay to the left. The next layer of the cable is constructed from twelve individual 1x7 strands that lay to the right. The clockwise and counterclockwise pressure of the two layers acting against each other ultimately prevents the cable from spinning in either direction. The non-rotational nature of 19x7 cable is useful not only for commercial applications such as crane operations, but also for mission-critical helicopter rescue hoists.
In the same way that commercial grade 19x7 aircraft cable prevents heavy loads from rotating during lifting, military specification 19x7 adds stability for rescue crews. If a rescue team were to use a 7x19 cable, they would spin during ascent and descent because the cable does not have the same non-rotating properties as a 19x7. In general, 19x7 is an effective choice for applications that require single line hoisting, because the cable is both incredibly strong, and well balanced. For additional insight on the strength properties, available materials, and sizes of our 19x7 cable, check out https://strandcore.com/products/aircraft-cable/.
To learn about how 19x7 aircraft cable can meet the needs of your application, contact our wire rope craftsmen, today.