Dyneema has the lowest elongation at break in comparison to all other synthetic fibers. Available in different sizes. This high performance rope is an excellent wire rope replacement for industrial and utility applications. Robert, Colligo Marine has several .pdf files on dyneema/dynex dux splicing and rigging. $7.00. Now prepare to do the second pass of a Mobious Brummel splice. Each deadeye consumes 4 feet of 9mm AS-78 and takes me around 1 hour to make. ... We are making up some anodized alloy thimbles with cross bars and corresponding fittings to go on top of the turnbuckles fo accommodate lashing. The two that are used mostly for standing rigging are: New England Ropes STS-HSR (Stronger Than Steel Heat Set Rope) and Hampidjan Dynice Dux. Any idea why the discrepancy? This means the rope will bend in the proper radius, even under load. I used 9mm Samson AS-78 for my deadeyes which will support 9mm dyneema stays and have no problems with them. Be sure to keep the first and second strands you cut off as you will use them later. I am not that gifted, so I take a different approach. Because the line diameter and the pin diameter are generally about equal strength in applications that use Dyneema, no thimble is required. You may be wondering if it will be strong enough since you are grossly under burying the tails? A light thimble can distort under high load. Synthetic Rigging Vs. Rod Rigging. Dyneema is a different material than steel so it needs to be sized differently. But for larger boats with larger loads, the thimbles you need to use terminals than open body thimbles The terminals are usually made of solid body aluminum terminations. The locking stitches will keep the tails from sliding around, which will also help keep everything in place and avoid the tails from sliding out to unravel. There is no way to pass the other line through as it is trapped on the other side of the grommet. The Crosby SS-414 Heavy-Duty Stainless Steel Thimbles are made from 304 stainless steel, and are the best choice in marine, wastewater and food handling environments. Picture courtesy of Colligo Marine Bottom line: Recommended for wire rope only. To get around this, you simply deconstruct and reconstruct the line as you make the splice. They offer a strength greater than steel without any of the corrosion issues. Bottom Line: Not our first choice. Deadeyes serve one purpose, that is to connect the synthetic stay to the chainplate. You have entered an incorrect email address! Braided dyneema is ok for trap wires but that is about it. The tapers will ensure an even transition from tail to no tail, preventing any sharp changes in the weave of the outer line. Any rope is weakened when loaded around a small radius. The DynIce Ultrabend 78 is based on the new bending fatigue resistant fibre Dyneema XBO with same low creep properties as SK78. Now pull the tails back out and cut them off just after the pin. Tag: Dyneema Synthetic VS. Vinyl Coated VS. Un-coated Stainless Steel Lifelines. The most common type is the simple open thimble, perhaps the most poorly suited for applications under heavy loads, because of the risk of chafe. Once again, a bit of poking outside the marine market finds what we need for less. Their ability to maintain strength even after being distorted is a great asset. To see these deadeyes in use, check out the links below. Which Boom Furler is the Best? This protection be partially restored in used ropes by treating them with certain water repellent coatings (see Winter Sailing Tips for Die-Hards, Practical Sailor, December 2016). This is why the gradual tapers are so crucial. Mind you that dyneema deadeyes are less than 12 inches long! Thimbles come in many types, including wire-rope thimbles, closed, or sailmakers thimbles, and captive-rope thimbles of many designs. 4. For determining block size, D/d ratios of at least 8 are recommended to cope with the loads and the greater potential for chafe. When terminating high modulus fiber like Dyneema® rope a knot for example can reduce the ropes strength by up to 60%. Like nylon, when the D:d ratio = 1, the strength of the eye is undiminished. Traditional and often cheap, lighter-duty open thimbles distort under load and have sharp edges. The central tie is only there to hold the thimbles in place. It also has advantages that no other thimble design can match: they cannot slip out of position, damage the rope, or scratch the deck. From here I bury the tails halfway through the other side and pull them out. The previous topping lift showed very little wear after for 15 years without any sleeve or thimble. We saw failures within the splice, at the end of the splice, in the throat, and even in the center of the rope, but never at the pin. For the junction to open up, the 12 woven strands need to unravel and separate in order to pull apart. This very traditional-looking bronze hawser-style thimble is sure to outlast the boat. Either welded or cast in an elliptical shape, these present no sharp edges that can damage a rope or sail. We’re not fond of wire rope thimbles for tough jobs. Shop, read reviews, or ask questions about Dyneema & Spectra Rigging at the official West Marine online store. In the case of nylon, some increase in diameter may be desirable for lines that are routinely loaded over their working load limit (9 percent of breaking strength). Bottom Line: Recommended by many years of use. The only down side is the ends are difficult to melt, and tucking it in is impractical in a splice. A wider throat angle can also weaken a splice. How can this be done?! A secret to side step the bury requirement is to perform a Mobious Brummel Splice. Add To Cart. This thin but incredibly durable covering proved virtually wear-proof in prior testing (UV, Chafe Protection, March 2105 Practical Sailor ). It also has the job of keeping the eye from being crushed. The typical recommended bury for a dyneema splice is 72 times its diameter. Now I have two sets of 2 strands on each side of the line. As usual, the first side is the standard and simple way. A couple of definitions:- Locking stitches will add extra insurance to make sure that nothing slips and everything holds. For additional wear, coat with Maxijacket. This toggle serves as a metal strap that will hold the deadeye securely in place. But what about eyes attached to polished stainless shackles? Now take the long strands of Dyneema that you cut off while tapering the tails and thread it through a needle. Add To Cart. When you look at a cross section of 12 Strand Dyneema, it can be grouped into 4 clusters of 3 strands. Figure 4: HPME stranded rope rigging (Dynice DUX) spliced around special thimbles and attached to (turnbuckles) rigging screws. The pressure from the woven tube crushing down on the burried tail will not allow the strands to unravel and will keep the splice secure. Bottom Line: The Best Choice in soft thimbles. Wire rope. Although they have a long, generally successful history, we’ve seen too many cases where the thimble itself did serious damage. Safe working loads Now you have a finished grommet made out of Dyneema that will be able to hold the rigors of standing rigging. Add To Cart. $32.00. F or small boats with standing rigging, steel was once the only choice, and it had to be ordered from a rigging shop with its fittings installed. This is a nicely formed, welded thimble. Worldwide delivery, even directly on-board! In addition, sailmakers thimbles can bend when strained to the limit by Dyneema, becoming loose. A cover is particularly useful for knotted lines, where it can also reinforce the knot. Had it failed, the consequences would have been serious. Dyneema rope, with spliced-in stainless-steel thimbles and simple lashings, makes strong, do-it-yourself standing rigging. $23.00. Now to bury the tails! At the heart of the problem is stretch. In the wake of a terrible tragedy that struck a few days before Thanksgiving in Sarasota, Florida, home of the Sarasota Youth Sailing Program... © Belvoir Media Group, LLC. I used 3/16-inch amsteel-blue, which is single-braid dyneema. The answer is "Yes", it will be strong enough. Dyneema deadeyes may look fancy with their loops and fittings, but the are actually just a dyneema grommet with two thimbles in them. Now balance the tails to ensure that everything you are doing is symmetrical. The central tie is only there to hold the thimbles in place. But are thimbles best, and is a thimble best or even required in all circumstances? I then work the dyneema to open the grommet back up and assume a close to finished size and mark where the tails exit the grommet with a pin. Rod Rigging. Factory-added spinning lubricants help resist chafe but don't last. For wire rope only. $30.00. I would much prefer 2.5mm Dyform over 3mm SK78 or even 90 that is braided. Cast from 304 stainless steel, these are well polished and strong. Follow along as we cross the Atlantic Ocean right now. The buried tails will wrap 3/4 of the way around the grommet. Heavy duty tubular thimble used on there own or in conjunction with Competion or Standard hooks for making up spliced winch lines Dyneema is classified as 12 Strand Class II rope, and relies on a long bury to securely hold the splice. After the tails are tapered, work them back into the grommet and work the grommet back to its expanded size. Often covers are available, either from high modulus line covers that have been stripped by racers, or salvaged sections of lines that have seen little wear (the portion of a halyard that lived inside the mast is often very good). Add To Cart. Stainless Steel Closed Rope Thimble Closed stainless steel heavy duty eye, made out of marine grade 316 stainless steel. Undoubtedly, a thick layer of steel provides the ultimate in abrasion resistance when attaching to a rusty, galvanized mooring shackle. Occasionally the splices are tightly lashed in place, but this is like treating the symptoms rather than the cause. 1. Rigging Doctor, 5820 Clarksville Square Drive, Clarksville, MD, 21029, United States, How to tension your synthetic rigging with deadeyes. and will seat and slip under load. German Engineering at its Finest. Bottom line: Just the thing for a traditional boat â¦ at a price. Sampson’s investment cast bronze hawser thimble was the most expensive in our comparisonÂ$38. The bottom line is that during our entire break-testing program of Dyneema, nylon, and polyester eye splices, we never saw a failure over the pin (see Sewn Splices Follow Up, PS June 2016). We were sent images of a bridle on a Jordan Series Drogue (a drag device used to slow the boat in a storm), and the bridle was severely chafed by a thimble that shifted. Fibers that stretch (nylon) do not suffer extreme strength reduction around a tight radius, because the fibers naturally share the load better. When you scrunch the rope together, the hollow center will open up. There are no sharp edges and they do not distort under high load. $16.00. For very high load, larger lines, and even knotted eyes, captive thimbles offer a more expensive but dependable solution. SVB - Europe's biggest online shop for boating equipment and accessories! Chafe can vary greatly depending on use. The following discussion of D/d ratios applies only to spliced eyes in a splice, in which each leg carries only 50 percent of the load. 1/4" HD Stainless Steel Thimble. Bottom line: Budget Buy in a closed thimble. Blue Line Thimbles are compatible with Samson’s high-performance, high-modulus, synthetic fiber ropes. Known as the world’s strongest, lightest fiber – 15 times stronger than steel, yet floats on water – Dyneema® works to stop bullets, repair human joints and improve the longevity of apparel. The thimbles at each must be larger in diameter than those required by wire rigging. Colligo dux is Dyneema based. To cut Dyneema rope, first take a piece of tape long enough to go round the rope at least twice. Dyneema deadeyes may look fancy with their loops and fittings, but the are actually just a dyneema grommet with two thimbles in them. The end that attaches to the pulpit has a nylon thimble and will be lashed to a SS eye on the pulpit; this lashing was supposed to provide 6:1 purchase to get adequate tension in the lifeline. Low friction rings are a robust and cost-effective addition to your boat. In many cases, this may be all the protection you need. But for most running rigging jobs, either no thimble or a webbing chafe sleeve is the best answer. 3/8" Winchline.com Emerald Green Dyneema® SK-78 Synthetic Rope Winch Line with Fairlead Thimble and Isolator - Emerald Green Separate the 12 strands into two groups of 6 strands. This means that for the 9mm line I'm using for these deadeyes, I need to bury 648mm (25.5inches) on each side. Suncor’s 3/8-inch stainless steel tube thimble offers excellent chafe protection where needed and will not easily become loose or dislodged. In other words, the grommet would need to be 25.5 inches in long. The bending fatigue tolerance is up to 5 times higher than for DynIce 78 and therefore very suitable for running rigging which has to tolerate lot of bending under high load and high temperature. Stainless steel rope thimble with bridge, made out of marine grade 316 stainless steel. The main benefits of composite, synthetic fibre rigging relate to a significant reduction in weight, a considerable increase in strength and the benefits of positive visual inspection. If you feel talented and gifted at weaving, you may re-weave the 12 strands into a hollow tube, as if nothing had happened. 12 strand has 12 tails, which means that you need to trim 11 of the strands to shorter lengths in a gradual and systematic method. Because each leg of the eye carries only half of the load, the stretch at 20 percent of breaking strength should be only 6 percent, but we must add to that some construction stretch, since it takes time for a splice to settle in. Class I fibers are not very slippery, so they require less bury; Class II fibers are very slippery, and require a longer bury. “In the end, Dux is like anything new. There is no fancy weaving involved because the 12 strands surrounding it will crush down on it like a Chinese Finger Trap when you try to pull it apart. 3. Bottom Line: Recommended for larger sizes. When splicing 12 strand, the tail is slid through the hollow center and left untouched. The tails should disappear into the grommet as if nothing had happened at all. All Blue Wave end fittings are made for and tested with spliced rope attachment. Cast from 304 stainless steel, these appear well-made and should be very durable. Parallel product like easy rigging and work the tails to ensure that everything you are doing multiple grommets, them... Takes me around 1 hour to make sure that nothing slips and everything.!, most commonly they ’ re called Dyneema or Spectra use Dyneema, used standing. 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