The rake shifts the sail centre aft and the bend in the mast flattens the sail, both of which we do not want in light winds. 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. I ran the numbers for the 10M by methods from three sources starting with David Gerr's book "The Nature of Boats." I replaced 3/16 rigging with 5/16 dynex dux and it's still ok after 10 years. We do support educated do-it-yourself sailors if you are confident and understand the rigging process. If I were only using turnbuckles for tensioning then I might have gone for DM20 to avoid running out of tensioning due to creep. If you are in any doubt about replicating your existing T terminals, please take some close-up photos with dimensions - the width, shoulder length and overall depth of the T shape. After this introduction, lets move on to a practical case. All the vertical tension turned into compression and bend. Be aware that this is not a simple conversion and can be quite expensive. This means that when the main halyard is released, the boom falls onto the coach-roof. But have you ever seen a boat so rigged? Designers typically specify standing rigging and attachments, including bolts, that are 1.3 to 1.4 times stronger than the calculated load. 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. Diameter and performance are determined by your boat length, the function of the rope, and the style of sailing that you do. Simple. Their page (from 2015) Before Ordering Your Colligo Dux Rigging links to a PDF table for sizing. 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. They are all full re-rigs from 119 wire with new rigging screws (please note all examples given are for supply only): By completely eliminating the backstay from the the list of elements constituting our standing rigging, which presented itself as an obstacle to increasing the roach of a mainsail, it is now possible to have all the roach we want and even square top mainsails. So I'm interested in your opinions. This fudge factor is intended to offset the fact that, regardless of the material used, it will degrade over time with aging and a lack of maintenance. 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). By giving the D1s a few symmetrical left-right turns we were able to straighten the lower part of the mast. There is no backstay at all, which is common on many modern boats. As for the adjustments to runners and checkstays, I leave them last, as we will see there are various options on how to use them. Then it made a bend to the right and then back to the left between the second set of spreaders to the masthead. The standard seems to be 2.5 to 3.0. 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. Check the thread size (standard or upsize) Select a turnbuckle which provides articulation e.g. The picture below shows the most common rigging terminals used at Jimmy Green Marine.From left to right, Talurit Thimble Eye, Fixed Eye, Shackle Toggle, Stud, Stemball (Elephants foot), Toggle Fork, the toggle fork on the bottom of a rigging screw, Fixed Fork, Hamma Spoon, and Flat Head. Once swaged, the terminal cannot be re-used or positionally adjusted. 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. 50 or so lbs up in the air, which translated to 200 less rail meat lbs! A change of about 1.5cm that was well noticeable at a height of 20 meters. They make the information from manufacturers such Marlow rather more accessible. The standing rigging is all rod on this boat. Overall, if you think you have a part that is not listed here, email a photo to the Jimmy Green Rigging Sales team and we will take a look. This will certainly lead to creep issues and probably re-splicing if you use turnbuckles. Can you break it down for me? If they are both too tight the mast becomes straight like a telegraph pole losing its beautiful shape. But these are for breaking strength of the wire. Therefore, with a strong breeze, we can intervened on the backstay to reduce the forestay sag and flatten the mainsail. And if in doubt, too long is always better than too short! There are additional developments of these three concepts: T-terminals areperhaps the trickiest identification recognition issue that you will face and it is also extremely important to get it right, so that your new terminals seat properly in their appropriate mast slot.The fittings may look similar, but if they are not specified correctly, theymay not fit the slot properly.Even though it may not immediately be apparent, incorrect seating can lead tostainless steel fatiguewhich, in turn, may cause premature failure.If your existing fittings don't seem to matchthe replacements that are available, it will be prudent to fit new, matching plates on the mast. To reduce the bend we had to reduce tension of the V1s but also monitor the tension of the D1s. But the disadvantages are cost (not just the line but also the thimbles) and windage (but we have a big boxy wheelhouse so are not exactly aerodynamic). Having worked and checked with runners and checks the sea trial was more for the pleasure of ending the day with some sailing. From the Rigger According to industry standards, the anticipated lifespan for stainless steel rigging is 10-12 years for wire and 15-20 years for rod. My personal opinion is that when offshore racing it is best to avoid easily avoidable risks. If you measure a pre-stretched line before splicing then you can stretch it after and by measuring know if you have removed the constructional stretch. Find a flat surface large enough that you can fully stretch your rigging out for measurement. The Pogo 2, designed around 2003-2004 is the Mini 650 with most boats built. Label all wire segments indicating their position. The tension of the low diagonals D1s controls the angle up to the first set of spreaders of the overall curvature that the mast takes up to the masthead. If it does not rotate, spray some WD40 but never twist the rod rigging. If you put your hands on the standing rigging without following a sequence and without knowing what you are doing, you end up like a dog chasing its tail. If you would like to measure your rigging yourself proceed to step 5. 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. For the Main Im thinking 12mm (larger than either the Colligo and Rigging Doctor calculations) and the largest size of Liros D-Pro-XTR available). There is nothing more expensive than a cheap boat! The numbers in the Toss and Henderson calculations were for a 2.5 safety factor. Although we work closely with the boatyard during the job, you will need to negotiate yard fees (crane, mast lay days, etc.) Since it was not me who had mounted the mast, I could not be sure that the turnbuckles had been inserted correctly, i.e. Their role is not simply to contain the main when dowsing it. Question: Do you have guidelines for selecting halyards, sheets, etc. Lets consider the mast of a Class40, with two orders of swept back spreaders and its standing rigging. Braided line density is the key to eliminating constructional elongation over time. Add shackles and splices from our Running Rigging Builder I have a 1988 Catalina 22'. We wont be re-rigging the main until after the 2021 season so have plenty of time to measure properly. At first, you will only see fields for two loads (Load 1 and Load 2), but once you enter a value for \small x_2 x2, the fields for Load 3 will show up . The Dyneema sizes can all be 10mm except the Liros D Pro Static [DFM20] which would need to go upto 12mm (no 11mm available). Reefing Line (reef 1) - Boom length x 2.5. Want to prolong the lifespan of your rigging? This will help to prevent metal fatigue. Like your car, your sailboat needs TLC. Remove any pins from your terminal ends before taking measurements. With the boat in the water and not wanting to take any risk, we didnt want to get to unhook any turnbuckle. The current shrouds are 5/32" diameter. To bring everything back to zero tension, I went up to the first set of spreaders and loosened the D2s which I would then adjusted last. I.e. Set sail with the benefit of Team Jimmy Green expertise. If you are replacing your turnbuckles, make sure the existing turnbuckles are adjusted to their normal set position for sailing before taking your measurements. UNF is the normal thread for standing rigging turnbuckles.Metric threads are possible on European manufactured masts - replacements are available.Switching to UNF is a good idea if you are replacing a complete stay because replacement components will be easier to procure.Imperial size wire is also quite rare in Europe, but is readily available in North America.Imperial components can be sourced but will generally attract a bespoke quote and much longer lead times. 37K views 7 years ago Jordan freshens up on his high school math to calculate what wire size we should order for our new standing rigging. If your rigging includes a shackle with a captive pin, the inside edge of the pin is the bearing point. They replace the topping lift and support the boom. For example, many chainplates are too thin to grip clevis pins correctly. Once you know the diameter of the wire, it will give you the load both in kg and as a percentage of its breaking strain. Effect of angle on capacity. Your email address will not be published. The checkstay, on the other hand, usually points where the foresail forestay attachment is located. Adjusting the rigging of a sailboat is less complicated than you imagine. 1/4" is usually 7/16" or 1/2". First we wanted to take care of putting the mast straight and solve the problem of its excessive rake. In addition to acting as a support for the mast in general, it allows you to decrease forestay sag without adding compression to the mast. We have had many customers who have found a great deal on a used boat only to discover that they need to spend a small fortune on new rigging. So the 3 different calculations give us (for the Liros D-Pro-XTR), Colligo (SK75): 7mmMarlow from Jimmy Green (DM20): 12mmRigging Doctor for SK99: 8mm, Colligo (SK75): 11mmMarlow from Jimmy Green (DM20): 15mm (but 13mm is pretty close)Rigging Doctor for SK99: 10mm. Lets go up whenever there doubt. On a boat like yours with single uppers and double lowers, the uppers see about 45% of the load and . Keeping your existing turnbucklesCheck the thread type (UNF or Metric) the thread size (standard or upsize)and, just to make sure, the thread direction. Many of our do-it-yourself customers with continuous rigs order their rigging with a swaged terminal at the top of the mast and a Sta-Lok or Hi-Mod mechanical fitting for the bottom so they can fit the rigging on site. 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). For the moment I wanted to see the mast without no tension in the D2s. That said, runners and checks play a very important role in stabilising the mast and reducing its stress. This will help to prevent metal fatigue.Check the dimensions of the fixing points for your shouds and stays, traditionally known as Chain Plates: The picture below shows a swageless eye terminal (top), a Talurit eye (middle), and a swageeye terminal (bottom).Swageless terminals are characterised by a short overall length and a relatively wide body diameter.Taluritis the process ofpressing the wirein a soft copper ferrule.Swages are slim and relatively long overall. For 6.5mm stainless steel the breaking strength is 3220kg. I will analyze your calculations carefully. The wind was not much but enough to load the mainsail close-hauled and verify that the mast remained straight. These work laterally to support the mast. Unfortunately lots of the information isnt clear about which they are referring to in their guidance. That is, it is no longer one of the elements of the standing rigging (albeit adjustable). Using our beam load calculator. Rigging Doctor for SK99: 8mm Main 8mm Stainless: Colligo (SK75): 11mm Marlow from Jimmy Green (DM20): 15mm (but 13mm is pretty close) Rigging Doctor for SK99: 10mm The choices get more tricky as Liros don't make every size (no 7, 9 or 11mm). The tension gauges are especially designed for accurate, repeatable tuning of a sailboat's standing rigging. After attempting to sort through the many personal. The slightly more expensive Petersen Stainless version (top) is machined from aluminium bronze bar with the open centres offset drilled from both sides making it 20% lighter than forged equivalents and equally strong. Website created by Primeconsulting. Those methods give a guide to sizing the wire for the 10M. Photos will help, but detailed dimensions are essential to ensurecorrect identification.If practicable, send a sample fitting or wire stay to the Jimmy Green Rigging Team.We can then relieve you of the responsibility by positively matching your existing terminal to the correct replacement. there is no M11 size. The distance between the hole and the top of the fitting - check that the new fork fitting has enough depth to accommodate the chain plate without obstruction. However, DynICE Dux is now back in the running, and with the possibility of 9mm for the Mizzen for about the same price as the 8mm Liros D-Pro-XTR. lol. It also has a module for calculating continuous beams and large facilities for manage the various materials used in the construction of modern boats. - MyR: software for the calculation of masts and rigging. We have a huge rope wall at Rigworks and are very proud of our selection and expertise. We had no option but to intervene by shortening the forestay, which in this case was adjustable. 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. 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. So, with or without your old rope in hand, stop by and chat with our staff. The lazy rigger screws the turnbuckle on deck a few turns so that he has only to hook the vertical shroud, the V1. It is your responsibility to assure that the slings you use are appropriate for your application. a toggle fork at the bottom end. Let us go over your rig from top to bottom and end to end to identify trouble before it gets worse. We highly recommend you hire a professional rigger if you are not familiar with this process. This is considerably less expensive than a full re-rig and, again, may identify issues before they become catastrophic. The amount of rake optimal rake is usually provided by the designer so you can do this job with absolute precision. special care should be taken to ensure that there will be sufficient material left on the tang/eye/plate if youintend toenlarge any holes. The boat was in the water, we first had to avoid the risk of unscrewing a turnbuckle and accidentally unhooking a shroud. Gerr and Toss both note that the lowers get more load than that and when there is more than one each should be capable of handling the full load. . The benefits are less windage and less weight aloft. What is meant when we say they are structural? I wish the rope companies made the creep properties easier to find. That is, the turnbuckles had not been hooked and tightened at the same simultaneously on lower and upper thread. Rig designers will calculate the optimum length of the unsupported lengths, or . We gave the forestay one more turn and removed a turn from the V1s and we were satisfied. rope than a cruiser. 3000 # is not enough to get rid of constructional stretch, and you would need to sustain your load over time. However, in long race, especially single-handed, offshore, it has some human contraindications. 100m of the 8mm should be plenty for the Mizzen with enough spare to replace several shrouds.Possibly from our back of the envelope calculations 150m of the 12mm for the Main should also give enough for several replacements. Tightening the left runner-checkstay pair seemed more or less ok. Starboard we clearly had a problem, the mast would bend to windward at the height of the second set of spreaders. It is indeed a complicated process in using a braided line for standing rigging. a) we need to replace the mizzen rigging before we launch b) there is no dock or anything at the boatyard so difficult to do c) Im not sure how this would work for a mizzen mast as it is shorter and so far aft, therefore it would be very difficult to heel the boat that far with just the mizzen and not very typical of the mizzen usage. I think that's the real problem to solve. Despite that, they do all agree that Dyneema needed to be sized for Stretch rather than for Strength. At the same time, by vertical compression of the mast, tensioning the backstay causes a bending of the mast that flattens the main. The wire diameter When measuring rigging, the convention is to measure from pin center to pin center or from bearing point to bearing point. If you need to replace a halyard, please dont pull it out of the mast. I.e the mast will go backwards to the first level of spreaders then stard bending forward from there to the masthead. For example, low stretch is very important in a halyard but not necessarily in a sheet. Having to remember this T-bone day and night in every situation is not the best of proposition. If your running rigging leads back to the cockpit, remember to account for that in your length. Differences emerged immediately, the D1 on the left was about 1cm shorter than the one on the right. Continuous rigging is more common on older and more traditionally rigged boats, while newer boats and performance-oriented sailboats often have discontinuous rigging.