The Double Figure 8 knot is used to create a secure loop in the middle of the rope.
It is known as Bunny Ears as it forms two loops which distinguishes it from Figure 8 on a bight and Figure 8 follow through loop.
It’s easy to tie and inspect in a short amount of time, so it’s popular in climbing, caving and search & rescue operations.
Let’s learn this knot in detail.
Double Figure 8 Knot Details
Type: Loop
Other Names: Bunny Ears, Super 8, Playboy Knot, Dog Eared Loop, Y-Hang
ABoK Reference: #1085
How to Tie Double Figure 8 Knot
The Double Figure 8 knot is based on a Figure 8 knot and it looks like Figure 8 on a Bight. But, two loops are created instead of one.
- Make a loop with long bight of rope.
- Fold the bight into half and feed it into the original Figure 8.
- Continue feeding the loop, but don’t pull it all the way—leave enough to create the twin “ears.”
- Tuck the large loop over the top of the knot.
- Bring the loop all the way to the bottom.
- Tighten the loops.
You have done it right if you have two fixed loops at the end of the rope with two parallel lines on each side of the knot and three parallel lines at the end.
To Untie, push the standing end upwards and pull the loop downwards. Then, unwind the rope through the loop.
Quick TIP: If you want the resulting eyes (loops) to be long, take a generous amount of bight.
Double Figure 8 Knot Strength
The Double Figure 8 knot is strong and secure.
According to research, the Residual Knot Strength (RKS) of this knot is 66.1-82.4%.
Several tests have been carried out particularly by HowNOT2 where he tested if this knot is actually redundant.
When the testing was done with only a single loop of this knot pulled and the other one empty, the other loop knot stayed intact.
The empty knot didn’t even tighten up and stayed in place.
Not only strength, the knot is reliable as well.
Each loop shares roughly equal portion (about 50%) of the load.
If one loop, anchor or carabiner fails, the rest will stay intact and won’t receive a large shock load either.
Applications and Uses
It’s used in rock climbing to equalize the load using two anchors in a top-roping technique.
It’s used for creating a makeshift harness or a seat for emergency rescue situations.
Climbing photographers and aid climbers also use this knot to secure themselves to an anchor line.
Double Figure 8 Loop Knot Used in Fishing
In fishing, the Double Figure 8 Knot refers to a different knot and not the traditional Double Figure 8 knot that we use in climbing.
The fishing variant of this knot consists of two Figure 8 knots which are tied in opposite directions.
When tightened, it creates a strong and reliable knot which is used to attach the fly to the tippet.
Related: Fishing Knots
Pros and Cons
Pros
- Easy to tie
- Forms two adjustable loops
- High Residual Knot Strength
- Easy to inspect
Cons
- Difficult to tie under a heavy fall
Other Loop Knots
French Bowline
The French bowline makes two adjustable loops that can be used as a Bosun’s chair to lower or hoist an object or person.
Spanish Bowline
Unlike the French Bowline, the Spanish Bowline has each loop fixed and is not adjustable.
It is used as a temporary Bosun’s chair.
Double Alpine Butterfly Loop
The Double Alpine Butterfly loop has a pair of secure loops in the middle of a piece of rope. It offers two clip-in points at once.
Bowline on a Bight
The Bowline on a bight makes a secure loop in the middle of a piece of rope, ideal for making a secure foothold in the middle of a piece of rope or for creating a Bosun’s chair.
Related: Bowline Knot
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