standing rigging size calculator Archives. That said, runners and checks play a very important role in stabilising the mast and reducing its stress. My personal opinion is that when offshore racing it is best to avoid easily avoidable risks. One method of seeing this is to take a piece of Dynice Dux (SK75) and cutting it with a very sharp knife, you will get what looks like a single line made up of 12 cells, it holds together that well. From the Rigger: Lets play Name that Stay Forestay (1 or HS) Read more, Question: What can I do to ensure that my Spinlock Deckvest is well-maintained and ready for the upcoming season? NE ropes has STS-HSR. There is nothing more expensive than a cheap boat! The benefits are less windage and less weight aloft. For safety and peace of mind, however, sailboat chainplates require attention and possibly upgrading. Continuous rigging is made up of single pieces of wire that run from the top of the rig to the deck allowing the tuning to be done at deck level. And they often find badly damaged Read more, Question: When your riggers talk about standing rigging, they often use terms I dont recognize. It does seem like some competition is popping up here and there for dux. If we observe the mast we will also notice that this setting will mean that when tightening runners and checkstay there isnt much change in mast shape. Stretch the wire straight and ensure there are no bends in the wire. 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. says the wire was 1/4". And if in doubt, too long is always better than too short! Question When should I replace my standing rigging? Boom Vang - Boom length x 2. Calculate the length of bury. Like your car, your sailboat needs TLC. However we had to make some assumption and one was that each pair of shrouds would be the same length. 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. The numbers in the Toss and Henderson calculations were for a 2.5 safety factor. Once swaged, the terminal cannot be re-used or positionally adjusted. To do this we tighten the runner with the checkstay lashing very short to start with. Usually they are made with dyneema and not just simple polyester. We had created a perfectly straight mast track, an adequate rake and a pre-bend. Raise then the equations of equilibrium will be more easy task. 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. This will help to prevent metal fatigue. Some say 52 diameters, other prefer 72 diameters. The bend instead arises from compression of the mast given by the tension of the V1s, these pull down the mast that bends forward. It is important to understand the influence of stay-V1 on the rake. My experience with 2 different 28.5 footers that I have owned is that 7/32" for headstay, backstay, and upper shrouds are very sturdy. 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. As posted above it seems like synthetic standing rigging is still the wild west. The rake depends on the relationship between the length of the forestay and the shrouds as a whole. 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. 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. If your rigging terminal contains a pin remove the pin and use this as your attachment point. The inner forstay and the staysail come up in about 16 knots of wind. This App is a tool that facilitates the calculation of basic rigging, weights of different profiles, and centers of gravity of composite loads. First of all, we unscrewed the turnbuckles of the V1s, whilst holding the upper threaded part integral together with the turnbuckle. For decades now, however, fractional rigs with swept back spreaders have been increasingly widespread. What does all this mean? Why not schedule annual service as you would with a car? Please read the instructions completely before you start measuring your rig. Generating 3D hull using only picture of boat. This curvature lets you bring the fat of the mainsail forward flattening the sail. Lower Fore St, Beer, East Devon, EX12 3EG. Here are a few suggestions. The IMS data shows a righting moment at 25 degrees of heel as 716 lbs/degree or 17,900 lbs. The tension gauges are especially designed for accurate, repeatable tuning of a sailboat's standing rigging. Unlike the Gerr formula the RM30 formula accounts for shroud base width. As mentioned, runners can be used in different ways. But these are for breaking strength of the wire. T-terminal is a generic term for all the different forms of shroud attachment favoured by mast manufacturers, both current and historic - T, T-Bar, Flathead, T-Ball, Stemball, also known as Elephants Foot, Stemball with Cup, Spoon and Shroud terminalare all variations on this theme. There is no backstay at all, which is common on many modern boats. Seldn estimates the main reef clew force to MSL (maximum in service load)=5.5kN, the reef tack load to MSL=3.5kN (10 Newton=1 Kg f). more expensive!) Take your measurements from pin center to pin center as seen in the diagram. This T-bone, if forgotten closed, supports the mast only at the level of spreaders, leaving the masthead free. Perform routine cleaning/polishing to remove corrosives, identify chafe points and other damage, and properly tune your standing rigging (shrouds, forestay, backstay). With proper measurements (wire diameter, pin sizes, wire lengths), we can give you a very accurate price for the standing rigging itself, but there are often unforeseen complications during the job (bad spreaders, corroded mast bases, hardware that is stripped on the mast, frozen pins, chainplates that are failing, etc. That said, on a nine-tenths rig it is unlikely that you could break the mast tip under spinnaker just because you did not set the runner. We took then tightened the forestay by the same two full turns on the turnbuckle. Its a popular model of Class40, a first generation Akilaria RC1, designed by Mark Lombard, from around 2006. You're right (I need to think about). This will be true for all three of your reef points. By measuring the total length of the turnbuckles and exposed thread, many things could be deduced. Be aware that this is not a simple conversion and can be quite expensive. So we are looking at approx 9300kg breaking strain Dyneema. Please do. That is, if the D1s are too tight and the V1s too, we can even force in an inverse curvature. When I arrived on this boat to check the mast, there were two problems noticeable with the naked eye. Each mast section is fitted with wire or rod sized to accept the loads generated at that section of the spar. Forum posts represent the experience, opinion, and view of individual users. Looking at the Jimmy Green table for all the Dyneema they sell we find that 7mm is good (except Liros dont sell 7mm so it has to be 8mm for the Liros D Pro Xtr [SK99] or 10mm for the Liros D Pro Static [DFM20] ). Both operations improve upwind performance. We are Patreons of Rigging Doctor, the combination of their YouTube channel and website has more practical resources on real world cruising use of Dyneema than any other Ive found. But without mast height I suppose this is only partly covering the shroud angle issue? On some boats a loop with T-bone is is used to shorten the checkstay lashing by a few centimetres. Website created by. I wish the rope companies made the creep properties easier to find. This could happen if theres something inherently wrong with the measures taken that would forced you to work at the limit of the available turns. Ill add Dynice Dux back into the pricing and options. The t-bone extra adjustment will not give you extraordinary gains and advantages upwind as theres only so much extra bend you can put in with a runner and loose checkstay. With the mast and rigging still standing and set to its normal sailing positions, tape or mark all the threads of the studs where they exit the turnbuckles. They have been very helpful in responding to email enquiries. As said, the backstay is simply not there, to make room for the square top mainsail. A sailboat's standing rigging is generally built from wire rope, rod, or occasionally a super-strong synthetic fibered rope such as Dyneema , carbon fiber, kevlar or PBO. 5 languages options can be chosen: English, Spanish, French, German and Portuguese. Z-Spars, Isomat.Opposite UNF thread is very rare and will entail changing the whole turnbuckle to avoid a bespoke solution. With the D2s completeley loose, the D1s were obviously too soft too. If I were only using turnbuckles for tensioning then I might have gone for DM20 to avoid running out of tensioning due to creep. Stainless does not like to be deprived of oxygen, so keep tape off your rigging to avoid anaerobic corrosion. This was not the case before, with a perceptible difference of several degrees. The righting curve is fairly straight line from 0 to 35 or so and the rate is actually decreasing so using the 716 lbs/degree will give a slightly high value at 30 degrees which is nicely conservative. Check the thread size (standard or upsize) Select a turnbuckle which provides articulation e.g. After attempting to sort through the many personal. That said, they play a very important role they help provide additional support for the mast. Those details about the differences of heat stretching at Fibre vs braided level are hard to come by. Put one end of the tape on the pin at the terminal held in the turnbuckle on deck, then stretch out the tape until you reach the terminal holding the eye to the tang up the mast. By now, I would say, even on cruising boats it is one of the most common rig arrangements. The wire diameter I see DSM is coming out with DM20 which is a heat treated pre stretched fiber. 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. We also set runners and checkstays just for safety. This means that when the main halyard is released, the boom falls onto the coach-roof. This table shows the normal UNF thread sizes for each wire diameter: This table shows the normal Metric sizes for each wire diameter: Note that there is no natural metric equivalent to 7/16" i.e. Herb suggests under 15% or even better under 10%. 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 rig of this boat is not particularly extreme or delicate, being the Class40s designed for great ocean navigation. Jimmy Green have 100m drums of 8mm in all 3 types of Dyneema from Marlow: Marlow Excel D12 Max 78 (SK78) is 1,145Marlow Excel D12 Max 99 (SK99) is 1,400Marlow M-Rig Max (DM20) is 1,337, LIROS D-Pro-XTR (SK99) is 868LIROS D-Pro Static (DM20) is 1,140, The Hampidjan (recommended by Colligo) 8mm rope is. The pre-bend, at a given a setting of the V1s, is controlled by the tension of the D1s and D2s. So unless you had to do a short inshore event with light airs predicted changing the setting for each and especially longer races makes no sense. 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. If you are replacing your turnbuckles, make sure the existing turnbuckles are adjusted to their normal set position for sailing before taking your measurements. The Supajust Eye Toggleand Swage (bottom) is a high specification stainless steel open body turnbuckle. 119 316 grade stainless steel Wire Rope (1 group of 19 wires, very stiff with low stretch) is standard on most sailboats. The listed prices for standing rigging by model reflect the rigging shown in our diagrams. By giving the D1s a few symmetrical left-right turns we were able to straighten the lower part of the mast. The picture below reveals the variation in thickness and head angle to the swage. There is no one-size-fits-all with running rigging. It is your responsibility to assure that the slings you use are appropriate for your application. - MyR: software for the calculation of masts and rigging. If you can get the cap, Colligo, Colligo, Colligo. Then it made a bend to the right and then back to the left between the second set of spreaders to the masthead. Check for anomaliesThe stud terminal on the end of the wire is normally right hand thread, while the bottom part connecting to the deck is normally left hand.We do occasionally come acrossa rig where the thread direction on the existing fittings is opposite to normal.Opposite rotation is an odd featurewhich sometimes occurs with metric thread on some French built mastse.g. The flogging of a loose shroud can actually be harder on wire than steady pressure. If you need to replace a halyard, please dont pull it out of the mast. The only downside to Dynice DUX is that it is quite stiff when new, and will take a few days of sailing to soften up. The Event, its name, logo, website, social media pages and all their content are the sole property of Marco Nannini LTD. All rights, title, intellectual property, Copyright, contractual and other entitlements of and relating to the Event, its name, logo, website, social media pages and all their content, vest in and are retained by Marco Nannini LTD. Still, as we will be doing the splicing ourselves, it isnt the end of the world if we need to shorten the shrouds once or twice in their life. This especially with loose D2s that do not prevent the section above from bending forward. This is why Marlow recommends DM20 for standing rigging, even though the elastic stretch in DM20 is so much more. One of the most frequently asked questions we hear is: How do I measure my sailboat standing rigging? Since this boat is sailed in the Mediterranean we must have a good light wind setup and be able to intervene on the shape of the sail as the wind increases. Effect of angle on capacity. They are adjustable both to raise the boom in port and to put them at rest during navigation. Therefore, with a strong breeze, we can intervened on the backstay to reduce the forestay sag and flatten the mainsail. However, between the sites we have found at least four ways of deciding what size is needed. If your running rigging leads back to the cockpit . And word of warning jobs often get expensive because the customer decides, once the mast is down, to add furlers, masthead units, new sheets and halyards, etc. I would suggest using larger than 1/4" dyneema. That is, it is no longer one of the elements of the standing rigging (albeit adjustable). 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. You can use the righting moment and rig geometry to calculate rig loads. Staying within elastic limits gives safety factors of 2.5, 2 and 1.9 respectively. This is our highest recommendation to make sure your rig fits properly. Know the sizes and lengths you need? They are not included in our estimate. All standing rigging is manufactured right here in our rigging shop -- the way it's been since 1984. Rust and discoloration can indicate the location of a crack or crystallization of the metal. We are happy to accommodate your requests, but the cost of your job will escalate quickly. https://www.ebay.ca/itm/5-13mm-HampiKl3MW1P7_hTkTw. From Marlow Ropes we have this: Others refer to Elastic Stretch, Constructional Stretch and Creep. This is the figure I used in the formulas below. 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. ). lol. Replacing your turnbuckles. Heat stretching is a bit like work hardening so if the fiber is already work hardened then the heat stretching at the braided level does not produce the Densest braided structure that you can get if the Dyneema fiber is not heat stretched before braiding. We will talk here specifically about boats with swept back spreaders. On this boat only the V1s on deck are adjustable, the rest of the shroud is of fixed length. Despite the absence of a backstay its not runners or checkstays that keep the mast up. You agree that your ultimate purchase and use of Lift-All slings must be determined by you to be appropriate for your specific applications. 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. for a mid 20 ft boat, the same change in riggin saved as little as 50 lbs. 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. This development has become more and more marked with boats with very wide spreaders and without backstay. They show up on your doorstep ready to use. From the Rigger: First, if your old rope served its purpose but needs replacing, we recommend duplicating it as closely as possible to ensure that the replacement is the correct length and works with your existing clutches, winches, etc. For example, port upper shroud (fig 3) or forestay (fig 1). I.e., that the problems were only in the adjustments of the turnbuckles. Shaking the furled headsail gives an idea of the tension of the forestay. We have chosen a Class40, a sister-ship of the boat with which I competed in the Global Ocean Race 2011/2012. This is considerably less expensive than a full re-rig and, again, may identify issues before they become catastrophic. As you size up creep and stretch will always be reduced. Check the thread type (UNF or Metric) the thread size (standard or upsize) and, just to make sure, the thread direction. 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).