Class II Double Braid Eye Splice

Eye splices are a great way to connect a shackle to the end of a line. In this example we will be attaching a halyard shackle to the end of the line using an eye splice. The line we are working with is VPC which is a technora/polyester blend. Since some of the fibers in it are technora, the rope counts as a high tech line and requires the use of a Class II Double Braid Eye Splice.

In the begging, everything is simple. You have your shackle and your VPC line. 

Then it all gets really complicated! But don't worry, it's not as wild and confusing as it might first seem. 

Your first step will be to put a pin through the entire line about 12 feet into the line that way the shifting core and cover won't affect the rest of the line. This will make your life easier later on in the splicing process.

Your second step will be to remove the core from the cover for the portion of the splice that will be buried. Since this is a Class II splice, you need to bury 2.5 fid lengths. The reason for this long tail is Class II cores are slippery. The longer the buried tail, the more friction can be passed to the tail to hold the splice in place. If you want to err on the safe side, simply make the buried tail even longer as this will increase the strength of the splice.

At 2.5 fid lengths (or more if you want to be safe) you will bend the rope and extract the core from the cover. When you bend it over, the cover fibers will stretch a bit and you can work them apart with a blunt pin or a small fid. Once the cover fibers are separated, you can insert a small fid and lift the core out of the cover.  

Once enough core is out of the cover for you to grab, you can simply pull the core completely out without the aid of any tools.

With the core removed from the cover, you might feel like proceeding with the splice! If you do, you will regret your life choices towards the end of the splice when the last bit of core doesn't want to go back into the cover and you are stuck with an unsightly bleb of core herniating out of the cover.

What you need to do now is equalize the core and cover. During the manufacturing process, the core and cover are woven at alarmingly fast rates. The result is a very tight core and cover that you might not be able to fit the fatter core after the splice into the cover. By equalizing the core and cover, the cover will be looser and it will help you later on to milk the core back into the cover. 

To equalize the core and cover, you will pull the core out of the cover and then milk the cover back over the core. This is why the pin through the rope is necessary, as it gives you a stopping point during the equalization. You will push the cover back as you pull the core out, then milk the cover back over the core. Repeat this three times and you will be done with this step. When you finish equalizing the core and cover, you will find that the core protrudes out a significant amount of core extending past the cover.

With the core and cover equalized, now is a great time to slip the shackle on for the halyard. The most annoying thing that could happen during the splice is beginning to bury the splice and realizing that you forgot to put the shackle on! If you put the shackle on now, you won't have to worry about remembering to put it on later.

With the shackle on, you can tie a slip knot in the exposed core to avoid it from sliding back into the cover.

With the shackle in place, you can measure the desired size of the eye by wrapping the line around the shackle. I prefer a small eye as this keeps the eye splice out of the shiv if your halyard ends up at the masthead. If you like a larger eye, simply give yourself more line to wrap around the shackle. On the other side of the shackle, you will bend the rope and pull the core out the same way you did for the tail. The slip knot in the tail will prevent you from accidentally pulling "tail core" into the loop instead of "core core."

At this point, you have everything exposed to carry out the splice. The tail is tied off, the loop is tied off, and the shackle (remember to put the shackle on!) is in its place. It is time to start burying everything and wrapping the splice up.

Pass a fid through the tail core and bury the tail cover inside the tail core. This makes the entire splice look much neater and helps to taper the splice inside the line.

To make sure everything is tapered properly, you want to taper the cover inside the core that way the transition from cover over core to core over cover in the splice. This will keep stress on the individual fibers low and increase the strength of the splice.

The tail is now passed through the loop on the other side of the shackle with the fid. A portion of the loop is consumed by the slip knot, so you will have to end short of the full loop. This is not a problem as you will simply exit the loop shy of the slip knot and then stretch out the loop over the buried tail.

With the tail in the loop, and the loop stretched out, you can see that there is still a portion of tail that is not buried. This would be a problem, since Class II cores are slippery and you need all the friction from length that you can get. 

This last bit is easily buried by simply inserting the fid back through the exit hole and passing it through the remaining loop once the slip knot has been removed. Now, the entire tail is buried, all that is left to do is to taper the tail and then bury it again.

The tail was tapered systematically, creating a very gradual decline in thickness that will produce a very subtle taper that will reduce any stress on the individual strands and produce a very strong splice.

With the tail buried, you can see the gradual taper in the line as it goes back into the cover. All that is left to do now is to milk the loop back into the cover and whip the splice. Since the pin is still in the rope, securing the position of cover and core, this process is relatively simple. The cover will slip over the spliced core easily at first, then it will become more difficult. The last bit will be a bear to bury, and if you didn't equalize the core and cover at the beginning, it might not actually bury. Having equalized, you should know that with enough force, it will bury. 

To do the last bit, you need to tie the rope to a sturdy point, such as a cleat, and yank really hard on the end. The snapping force will bury the core into the cover in very small increments, but it will eventually complete the task.

Whipping helps to secure the splice and make everything look pretty. You can see the tight eye splice wrapping around the shackle as it turns back to bury in the line. You shouldn't worry about the tight radius turn over the shackle because making the eye larger will not change the radius of the shackle that the line turns over.

The final test is to feel the halyard and see if you can feel a step inside the cover where the splice ends. If you did a proper taper, the line will gradually get smaller until you reach the end of the splice and are unable to positively locate the end of the buried tail. This very gradual change in size reduces the stress on the strands and that will maintain the strength and integrity of the splice.

Knot Funny

Crown Knot vs. Wall Knot

Two seldom known knots that are very useful are called the Crown Knot and the Wall Knot. These two knots, while they appear different once tightened, are actually the same thing!

Wall Knot

Crown Knot

The only difference between them is which way the tails run after the knot is finished. A Wall Knot has the tails continue in the original direction of the line. A Crown Knot has tails that continue in the opposite direction of the line.

Both knots are tied by looping through the other lines, simply finishing with the lines exiting the loops in on the top or on the bottom to differentiate the two knots.

Wall Knot

Crown Knot

Wall Knot with Crown Knot

As you can see, both knots are made by looping the lines through each other, the only difference is where the end of the line exits the knot. If it is above the loop, it will make a Wall Knot. If it is below the loop, it will make a Crown Knot. When deciding which of these knots to use, it is important to know what you are trying to achieve.

If you are creating a knot in the middle of a line, a Wall Knot would be your best choice. If you are going to perform a back splice, a Crown Knot will hold the end of the line together while positioning the tails in a position, ready to bury into a back splice.

The crown knot is actually used to bind the end of a line in the Tree Surgeon's Backsplice. It positions the tails ready to bury in the backsplice. The buried tails will not budge since the spliced into the rest of the line and the knot will hold everything together, no matter the abuse that the line is subjected to.

Wall Knots are sometimes used for decorative purposes, since they can be placed inline with the cords that hang lamps and baskets inside the hull. Another decorative use for the Wall Knot and Crown Knot is to combine them.

A Wall Knot will create a nice twist in the line and secure the strands. A Crown Knot placed over the Wall Knot will create a nice button at the end of the line. The tails will be oriented back towards the original line and can either be spliced back into the line or trimmed off short. 

The combination of these two knots will create a decorative button knot that can be used to secure loops and lanyards.

Soft Shackle Knot

Soft shackles are a very handy tool on a sailboat; they can securely attach something and hold incredible loads while weighing next to nothing and posing no risk of damaging the boat. Best of all, they require no tools to install or remove!

A soft shackle can be used anywhere a regular shackle would be used. The difference is a regular shackle is made of metal and can scratch your topsides or pound into your deck. A soft shackle is made of dyneema and is very soft and flexible, making it safe to use anywhere that you wouldn't want damaged by a regular shackle.

One of the most important parts of a soft shackle is the bulky knot at the end. This knot will be the weak point in the soft shackle, as stress will accumulate near it and the sharp bends of the knot will further weaken the dyneema. Several different knots have been suggested for this purpose, with the goal of minimizing stresses. 

The ideal soft shackle knot is bulky and does not twist under load. To avoid twisting, the tails of the soft shackle need to both share the load of the knot. A symmetrical knot would be ideal in this situation as it will then share the loads evenly between the two tails of the soft shackle. Minimizing the sharpness of the bends of the knot would also help prevent stress points in the knot which would lead to premature failure of the soft shackle.

The Lovers Knot is a good candidate for this purpose, as it is a bulky, symmetrical knot with no very sharp bends. 

Lovers Knot before tightening

Once the soft shackle is ready to tie, stretch out the two tails parallel to each other.

Take the top tail and pass it under the lower tail, around the front of the soft shackle, and then under the top tail. This will form a half hitch with the top tail.

Then take the lower tail and pass it over the upper tail, behind the soft shackle, through the loop formed by the first tail, and over the lower leg, forming another half hitch.

You want to end up with two interlocking half hitches with the tails exiting through the same section of the knot.

As you tighten the knot down, be sure to pull evenly on both tails, this will ensure that the knot is balanced and even. Be sure to position the knot very closely to the mobious splice, which will ensure that the tails are not going to move or be at slightly different lengths which could lead to more stress on the overloaded tail.

Once the knot is fully tightened, it will work well to secure the soft shackle and allow the unit hold itself together under incredible loads.

Double Braid Backsplice

Back splices work exceptionally well at preventing the end of a rope from unraveling. It secures the end of the rope into itself and makes sure that none of the strands can work their way loose and fray. A back splice is simply a splice where the end of the line is doubled back on the line itself, tucking its ends back into the line.

An alternative way to finish the end of the line is to whip it, but whipping is not as strong as a back splice. If the end of the line will be subjected to a lot of abuse, whippings can become chafed and break, leaving the tail free and able to unravel. In these situations, a back splice is much more secure and will hold up over the years, even with the frequent abuse.

For this example, I will be putting back splices in the ends of our jib sheets. We will be working with New England Ropes VPC, but the methods are the same with any double braid line.

The first step is to place a pin through the cover and core several feet back into the line. This will prevent the core from sliding too far out of the cover and will make your life easier later on in the process.

Next, open the threads of the cover to expose the core further back and pull the core out of the cover.

Pass a fid through the core in the opposite direction of the line. The fid should enter the core a few inches back from the end of the line and exit just before the core re-enters the cover.

Feed the end of the cover back through the core. This will create a loop where the cover turns back on the core and runs in the opposite direction to the rest of the line.

Pull the cover through the core and well out the other side, allowing the core to bunch up over the cover. Then taper the cover by selectively cutting the threads. VPC is covered in groups of four threads that are woven together. By selecting and removing three of the four threads of each grouping, the cover can be neatly reduced in a systematic and organized manner. This allows you to reduce the bulk of the cover and produce a consistent taper that will still maintain itself neatly woven.

With the cover tapered, milk it back into the core. As you work it back into the core, the cover will disappear into the core and the transition from cover entering the core to pure core should be seamless.

Cover follows the blue arrows. Core follows the orange arrows. They move in opposite directions forming a loop with one another.

The core splits out of the cover and goes to the left, doubling back and exiting to the right. The cover splits off the core and goes to the right entering the core as it passes by. The core and cover are going in opposite directions and form a loop with a tail. The tail should be longer than the amount of cover buried in the core, otherwise the back splice won't work out in the end.

The excess core is removed, leaving what looks like an eye splice. The cover will be very loose over the core leading all the way back up to the pin that is holding the two in a static position relative to each other.

Secure the line to a strong anchor. I use one of the secondary winches in the cockpit, winding the line around the drum so that I can pull against it with a great amount of force to milk the cover over the core and complete the back splice.

Pulling hard on the cover and milking the cover over the core will allow the core to slip back into the line. The cover that is now inside the line will be pulled by the core back into the line, making the end of the rope double back on itself.

Whipping the end will ensure that nothing works itself loose. It was stated earlier that back splicing is better than whipping, yet back splicing uses whipping! The whipping in a back splice is not as critical to hold the line together. If the whipping chafed away and fell out, the splice would still hold and keep the end of the line together until a new whipping could be installed. A line that was only whipped would begin to unravel as soon as the whipping had come out.