How to Tie the Directional (In-Line) Figure 8 Knot
Usage
The Directional Figure 8 Knot, also known as the Inline Figure 8, is a midline loop knot designed to take strain in only one direction. It is commonly used in climbing, hauling systems, and rescue operations where a secure directional loop is needed. However, it must be loaded correctly—pulling from the wrong direction can cause the knot to capsize and tighten like a noose.
Why Learn the Directional Figure 8 Knot?
This knot is quick to tie, easy to inspect, and strong under proper loading conditions. Unlike other midline loops, it provides a secure load-bearing attachment point without requiring access to the rope’s ends. However, for situations where the load may shift or apply force in multiple directions, the Alpine Butterfly Loop is preferred.
Common Uses
-
Climbing & Mountaineering:
- Creates secure attachment points for climbers and gear.
- Used as a handhold on hauling lines.
-
Search & Rescue Operations:
- Integral to Z-Drag mechanical advantage systems. Provides anchoring points in rescue setups.
-
General Utility:
- Useful for tensioning ropes in rigging and industrial applications.
ABOK Number
(Ashley Book of Knots)
Other Names
Category
|
Notable Features
- Load Direction Matters: Must be loaded in the correct direction to maintain security.
- Quick to Tie: Forms a strong loop in the middle of a rope.
- Jams Under Load: Can be difficult to untie after a shock load.
Variations
The Directional Figure 8 Knot can be modified for different applications:
- Adding an extra wrap before tightening increases security, reducing the risk of capsizing.
- Using a backup knot such as a stopper knot can provide additional friction to prevent accidental loosening.
Similar Knots
Alpine Butterfly Loop vs. Directional Figure 8
- Pros: Holds securely even under multi-directional loading.
- Cons: Slightly more complex to tie.
Figure 8 on a Bight vs. Directional Figure 8
- Pros: Strong and easy to tie anywhere along the rope.
- Cons: Weaker than the Directional Figure 8 for single-direction loading.
Bowline on a Bight vs. Directional Figure 8
- Pros: Creates a strong, double-loop anchor point.
- Cons: Bulkier and more complex than the Directional Figure 8.
History
The Directional Figure 8 Knot is documented in The Ashley Book of Knots (ABOK #1058) and is considered a variation of the Single Bowline on the Bight. Historically, it has been favored in climbing, rescue, and rigging for its ability to create a load-bearing loop in the middle of a rope without requiring access to the ends.
Security Level
The Directional Figure 8 Knot is highly secure when loaded correctly. However, it is not recommended for multi-directional loads, as improper loading may cause it to collapse into a noose.
Downsides
- Prone to Capsizing: If the load direction shifts, the knot can deform.
- Difficult to Untie: Can jam after heavy loading, making it hard to undo.
Structure
- Form a bight in the rope.
- Wrap the bight over the standing part to create a loop.
- Pass the bight under and back through the loop, forming the figure 8 shape.
- Pull on the loop and standing part to tighten the knot.
FAQ
What is the Directional Figure 8 Knot used for?
It is used for creating secure attachment points in climbing, hauling, and rescue operations.
How does the Directional Figure 8 compare to the Alpine Butterfly Loop?
The Alpine Butterfly Loop can hold loads in multiple directions, while the Directional Figure 8 is stronger for single-direction loads.
Can the Directional Figure 8 be untied easily?
No, it can jam after heavy loading, making it difficult to undo.
Is the Directional Figure 8 Knot safe for all applications?
Only when used in the correct loading direction—otherwise, it may capsize and fail.
Important Notes on Safety
Always verify the correct loading direction when using the Directional Figure 8 Knot. If the load may shift unpredictably, consider using the Alpine Butterfly Loop instead.
