And they often find badly damaged Read more, Question: When your riggers talk about standing rigging, they often use terms I dont recognize. 1/4" is usually 7/16" or 1/2". The best bet is to shop with your old rope in hand. If you have a lashing in the design you can have shorter shrouds and a longer lashing so that you have plenty of space to keep tension as creep lengthens the shroud. The simplest and quickest way is to use a rig-tension meter, such as the Loos gauge. Using our beam load calculator. If we follow the table they include from Marlow for their DM20 line (Marlow M-Rig Max) then sizing is huge: 11 or 12mm for the Mizzen and 15mm for the main. For a -inch turnbuckle with a -inch toggle, the chainplate should be at least inch thick. For safety and peace of mind, however, sailboat chainplates require attention and possibly upgrading. In this article we will deal with the tuning of standing rigging of a typical sailboat. Both SK90 and SK99 are heat stretched at the fiber level so that makes them a little more difficult to heat stretch completely at the braided line level. That is, the turnbuckles had not been hooked and tightened at the same simultaneously on lower and upper thread. Add that amount for each splice (it won't amount to even 36 feet in either case), plus the distance around the thimble. The Gerr method seems to go a bit smaller but all of them are smaller than the OEM rigging on the 10M. I need to do some more study and number crunching. The checkstay, instead, was tied to the first pulley with a lashing so that it could be adjusted in length. Runners and checkstays are not structural, therefore are not to be considered part of the standing rigging per se, the mast does not need them to stay up. T-terminal and some have more than one common name, but this guide will help you to recognise which ones are correct for your rigging. That is, it is no longer one of the elements of the standing rigging (albeit adjustable). This will help to prevent metal fatigue. Despite that, they do all agree that Dyneema needed to be sized for Stretch rather than for Strength. We were thinking LIROS D-Pro-XTR (SK99) as by far the cheapest option (and as SK99 is stronger than SK78 we should have less creep than the cheapest Marlow option which is SK78). Check the deck around the chainplates and mast for cracking and delamination. Stainless does not like to be deprived of oxygen, so keep tape off your rigging to avoid anaerobic corrosion. My understanding is if you allow for this and pre-stretch your stays you can reduce the need for re-splicing. On this Class40 the runner was attached to the first pulley and therefore its length was a given and could not be adjusted. We would be happy to loan you a tagline (strong and thin) to use as a place holder, or we are always happy to visit your boat and tag it out for you. It can be minimised by keeping static loads as a small % of the breaking strength, so grades of Dyneema with a higher breaking strengths will creep less under the same load. They are not included in our estimate. The bend instead arises from compression of the mast given by the tension of the V1s, these pull down the mast that bends forward. The IMS data shows a righting moment at 25 degrees of heel as 716 lbs/degree or 17,900 lbs. Their sizing post is Sizing for Creep. Get regular rig inspections! For example, low stretch is very important in a halyard but not necessarily in a sheet. So we measured the total length of the left and starboard turnbuckle system for both the vertical shrouds (V1) and the low diagonals (D1). This post has taken an age to research and write. Each complete turn corresponded to approximately 3-4 millimetres in length. Lift-All makes no guarantees that the information provided in the calculator is correct. We had no option but to intervene by shortening the forestay, which in this case was adjustable. This was not the case before, with a perceptible difference of several degrees. I hear about these guys on every forum everywhere. The benefits are less windage and less weight aloft. In the design of the Dyneema chaimplates I mentioned sizing them up, but of course the line is doubled so Ill use the same size for the chainplates as for the shroud/stay attached to them. 3/16" for lower shrouds is also what I had. These are boats where you usually an average setting and not touch it before a specific event. On a Mini 650, to avoid too many lines, and with a boom that weighs a few kilos, nothing replaces the topping lift. 2.5mm 1x19 Stainless Steel Wire Standing Rigging Custom Build 3mm 1x19 Stainless Steel Wire Standing Rigging Custom Build 4mm 1x19 Stainless Steel Wire Standing Rigging Custom Build 5mm 1x19 Stainless Steel Wire Standing Rigging Custom Build 6mm 1x19 Stainless Steel Wire Standing Rigging Custom Build 7mm 1x19 Stainless Steel Wire Standing Rigging Unfortunately lots of the information isnt clear about which they are referring to in their guidance. We are confident that you will look forward to our emails. Lets go up whenever there doubt. For 6mm stainless steel the breaking strength is 2880kg. Both operations improve upwind performance. I have an older Hallberg Rassy 35 (yep, thats the new challenge) - and currently the rigging appears to be 5/16" wire (that's what the local rigger measured, it seemed slightly smaller to me but he probably does a better job at measurment). Good question. The pre-bend, at a given a setting of the V1s, is controlled by the tension of the D1s and D2s. This is especially important for the forestay attachment if it is an integral part of the stemhead fitting. But, the overall curve of the three sections of the mast was not yet regular. They make the information from manufacturers such Marlow rather more accessible. Certainly distributing the tension between runner and checkstay greatly reduces the load of the standing rigging. A customer came into our shop the other day to discuss his 33-year old rigging. They have been very helpful in responding to email enquiries. iPhone. The picture below reveals the variation in thickness and head angle to the swage. In order to confidently specify a replacement for any element of your standing rigging, you will need to know what your existing components are called and how they are measured.Some end fittings have generic names e.g. There is nothing more expensive than a cheap boat! The amount of rake optimal rake is usually provided by the designer so you can do this job with absolute precision. The other positive about Dynice DUX is that it is only slightly more expensive than Vectran or Dyneema, vs. PBO which is incredibly expensive. So, in order to avoid any dangers, we set the inner forestay (to double up with the forestay). It is important to do this while the mast is still up and set for normal sailing as this will be the base line to produce your new rigging. Again, increasing the line diameter reduces the problem as does being able to get enough tension to stretch out the elasticity so that the rig doesnt flop around. Everything was in order throwing in a few tacks confirmed that the boat made sailed the same angle to the wind on both tacks. For 6.5mm stainless steel the breaking strength is 3220kg. From the Rigger: Most boat owners do not climb their masts regularly, but our riggers spend a lot of time up there. We start by calculating the designed tension of the shrouds by assuming it is no more than 20% of the breaking strain of the stainless steel. On DayBoats, Trailer Sailers and small yachts, a standard 1x19 wire can be bent around a stainless-steel thimble and Talurit pressed into position using a copper ferrule. N.B Selden T terminals are a similar size and shape to the Hasselfors Flat Head design. Elastic Stretch is much the same to work with as creep except that it will show up quite quickly, so a few re-tensions in the first few months should sort it. It becomes simply the means to adjust the mast bend and curvature and would be considered and its control line is therefore part of our running rigging. It is important to use a tape measure under tension and that does not stretch. Could someone please speak of the advantages / disadvantages of increasing the. special care should be taken to ensure that there will be sufficient material left on the tang/eye/plate if youintend toenlarge any holes. This development has become more and more marked with boats with very wide spreaders and without backstay. Consider pulling your rig every 5-6 years to inspect the mast base, chainplates, turnbuckles, wire, etc. The Lift-All Sling/Leg Length Calculator has been designed to assist you in selecting the appropriate size slings for your lifting applications. Let us go over your rig from top to bottom and end to end to identify trouble before it gets worse. And if in doubt, too long is always better than too short! We had created a perfectly straight mast track, an adequate rake and a pre-bend. Despite the absence of a backstay its not runners or checkstays that keep the mast up. Select your wire construction KOS 1x19 - this is the standard wire for standing rigging on Cruising Yachts Petersen Compact Strand - for higher strength performance KOS flexible 7x19 - for applications where the wire will be required to turn around sheaves. They replace the topping lift and support the boom. Having worked and checked with runners and checks the sea trial was more for the pleasure of ending the day with some sailing. Standing rigging is the collective term for the system of wires (or rods) that supports the mast, both fore-and-aft and laterally. All rights reserved. From the Rigger: Most boat owners do not climb their masts regularly, but our riggers spend a lot of time up there. So you cant simplify this by saying to keep the working load below a certain percentage of break strength. Whats up? Sounds interesting regardless. Standing rigging has been our specialty for over 40 years. In this case the forestay does not reach the masthead but only up to seven eighths or nine tenths of the mast height and so do the attachments of the shrouds. 1x19 Wire Rigging Stainless Steel 1x19 Wire Rope Rigging is the most popular solution for standing rigging on cruising yachts. From the Rigger: Lets play Name that Stay Forestay (1 or HS) Read more, Question: Do you have guidelines for selecting halyards, sheets, etc. Then we can help you fine-tune your rope selection and length before cutting. Standing Rigging CalculationBack to Rigging By appearances the 10M is a very heavily rigged 33 footer. So the sites we have used are below and for each I have sized replacements for our Mizzen mast (currently 6mm or 6.5mm Stainless Steel cant be sure until we can visit) and our Main mast (currently 8mm we think). Taking the total capacity of the upper and lower shrouds compared to the shroud load calculated using the RM30 formula gives a safety factor of 4.2. But without mast height I suppose this is only partly covering the shroud angle issue? Cruising boat rigs can have up to three pairs of spreaders, depending on a number of factors, including the boat's size and type. If you would like to measure your rigging yourself proceed to step 5. We always look forward to seeing you! (If you prefer more choices, please see our Running Rigging Builder.) The first is the RM30 heeling test to calculate rig loads. Question: My halyard is binding. Establish the thread size, type and directionWire terminals that have a thread for connecting to the next component are known as studs.Stud terminals are denoted first by the wire diameter and then the thread type and size because each wire diameter can have more than one thread option.The thread options are generally referred to as downsize, standard and upsize - these are broadly categorised in the same way by all the manufacturers.UNF thread is the most common in the UK, but Metric is always a possibility - bear in mind that the yacht or the mast may have originally been built in Europe where metric threads are more prevalent.Stud terminals are normally Right Hand thread but it is worth checking, especially if they are metric thread on a French built mast. The eye will serve as your pin center. This yields a shroud load of 6,000 pounds. Lower Fore St, Beer, East Devon, EX12 3EG. If your running rigging leads back to the cockpit . If you cut heat stretched SK90 or 99, you will get 12 strands that fall apart. The curve to starboard between the first and second set of spreaders was attributable to the upper diagonal D2 on the starboard side, which was tighter than the left one. The wire diameter The curvature was accentuated between the first spreaders and the masthead so I went up to the D2s to give a first rough and symmetrical adjustment. Required fields are marked *. Runners attachments seen from the mast top Although the mast is made of carbon rather than aluminium, the rig is the same as that of a Mini 650 Pogo2 from Structures shipyard. The boat was in the water, we first had to avoid the risk of unscrewing a turnbuckle and accidentally unhooking a shroud. Boat Design Net does not necessarily endorse nor share the view of each individual post. So, I resorted to trusting my sensorial memory. When measuring rigging, the convention is to measure from pin center to pin center or from bearing point to bearing point. Stretchy is slightly problematic because there are multiple forms and the terminology used isnt consistent. The boom will rise again when we tension the reef line and this rarely even needs the boom to be helped by hand. Question: Do you have guidelines for selecting halyards, sheets, etc. One area still to be worked out is how much length to allow for creep. There is no one-size-fits-all with running rigging. What is meant when we say they are structural? Staying within elastic limits gives safety factors of 2.5, 2 and 1.9 respectively. To do this we tighten the runner with the checkstay lashing very short to start with. The cost to replace standing rigging obviously varies from boat to boat. You agree that your ultimate purchase and use of Lift-All slings must be determined by you to be appropriate for your specific applications. In addition to this it was clear that when the starboard runners and checkstay were tensioned, the mast deteriorated in shape. This especially with loose D2s that do not prevent the section above from bending forward. That's a little high because it's using the combined capacity of the lowers and reality will have them loaded differently. Lets be very conservative and assume we are looking at existing stainless 6.5mm for the mizzen and 8mm for the main (will check as soon as we are allowed to visit the boat). We also attached spinnaker halyards one to the left and one to starboard to an eyebolt. I.e. This is the same both on Mini 650s and on Class40s. Ill add Dynice Dux back into the pricing and options. The wire is inserted into the hollow terminal and pulled through a set of roller dies. A high-performance racer might require a lighter, stronger, lower stretch (i.e. We have a huge rope wall at Rigworks and are very proud of our selection and expertise. See other options in diagram to the right. If a rigging screw is supplied as part of a finished wire, the measurement will be made with the screw two thirds open as shown below. Raise then the equations of equilibrium will be more easy task. Its a popular model of Class40, a first generation Akilaria RC1, designed by Mark Lombard, from around 2006. The mast of the Class40s are, pass me the term, quite ignorant, and dont it is not about fine tuning that last half turn. As a quick side note people often ask if they should switch from rod to wire rigging or vice versa during the re-rig (usually from rod to wire as rod is much more expensive per foot). One of the most frequently asked questions we hear is: How do I measure my sailboat standing rigging? Question When should I replace my standing rigging? This is because upwind mast is fully loaded at just 15-16 knots after which you need to reduce sail. Marlow recommend one thing, Colligo another, they both swear by the logic! [Update]See the first comment below from John Franta, Colligo Marine where he explains the difference between heat stretching at Fibre level (SK78 and SK99) vs at the Braided level (SK75). Confirm Hole Diameters and Pin SizesIt is critical to the load bearing capacity of the rig that the holes and clevis pins are closely matched together without any play.Ordering terminals with pins that are too large fortheir allotted holes onboard will either mean some awkwarddrilling/reaming or starting the ordering process again.N.B. If the D2s are set correctly setting each pair of runners and checks in turn should not produce any curvature either side from the first spreader to the masthead. What makes this even more complicated is that a) there are lots of variations of Dyneema available, also b) each rope manufacturer has their own ways of treating Dyneema (eg pre-stretch, heat treatments, and coatings) which makes comparisons even more difficult. Why not schedule annual service as you would with a car? Before adjusting them, however, we could use them to do a test on the adjustment so far of our mast. It is important to understand the influence of stay-V1 on the rake. In our case it was evident that the port turnbuckle had many more turns than the starboard side, compared to the thread of the V1 above. Tensioning the backstay, the central part of the mast advances forward creating a slight C shape of the mast seen from the side.

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