What determines how much stretch a Kernmantle rope will have?

The amount of stretch in a Kernmantle rope is primarily influenced by the method of braiding or twisting the core bundles. The construction techniques employed in making the rope affect how the fibers interact with each other during loading. In a Kernmantle rope, the core, which is responsible for the rope's strength, absorbs most of the load, while the outer mantle protects the core and contributes to its durability.

By varying the way the core strands are braided or twisted, manufacturers can create ropes with different stretch characteristics. For example, tighter braiding can lead to less elongation under load, while looser braiding allows for more stretch, contributing to the energy absorption properties of the rope. This flexibility is crucial in rescue scenarios where managing dynamic forces is essential for safety.

Other factors, such as the diameter, type of fibers used, and length of the rope, can also influence stretching but are secondary to the specific construction methods of the rope itself. The braiding or twisting affects the overall integrity, resilience, and performance under load, making it the primary determinant of stretch in Kernmantle rope.