The alpine butterfly creates an omnidirectional loop in the middle of a length of rope.
How to tie
When to use
- Isolating a core shot: When the sheath of a rope is worn through, exposing the core, that core shot should be isolated before rappelling on the rope. In the field, this can be accomplished by forming an alpine butterfly with the core shot in the loop.
- Creating a rigging point in the middle of a rope: Any two of the alpine butterfly's two ends & loop can be pulled on (it is omnidirectional), unlike a figure 8 on a bight, which cannot have both its ends tensioned.