standing rigging size calculatorstanding rigging size calculator

A UK Chartered Engineer and Fellow of the Institution of Mechanical Engineers he has, since 2001, managed the rigging engineering group at Bechtel. I have a ketch with 1/4" SS on the main and 3/16" on the Mizzen. The lazy rigger screws the turnbuckle on deck a few turns so that he has only to hook the vertical shroud, the V1. When the T-bone is undone, the runnner has more relative tension than the checkstay as by undoing the T-bone we have effectively lengthened the checkstay. standing rigging size calculator Archives. This turnbuckle features calibration, one extra-long stud and a fold-out arm to facilitate easy adjustments. He asked Isnt the industry standard just a ploy by manufacturers to sell more wire. The Dyneema sizes can all be 10mm except the Liros D Pro Static [DFM20] which would need to go upto 12mm (no 11mm available). The price difference of the DM20 lines over SK99 or SK78 is still huge. Assuming it fits in our racks and we have room, we may be able to avoid mast lay day charges by storing your mast here at Rigworks. We will talk here specifically about boats with swept back spreaders. So 716 * 30 gives an RM30 of about 21,500 lbs. This type of rig is fitted with a runner at the mast top and a checkstay at the height of the inner forestay. Attachment to the deck, the bottom terminalsDecide whether you are going to replace the turnbuckles (rigging screws) or just the end terminals.If the turnbuckles are the same age as the rest of the standing rigging, or they show any signs of fatigue, it will be prudent tostart afresh with all new components. I see DSM is coming out with DM20 which is a heat treated pre stretched fiber. That's a little high because it's using the combined capacity of the lowers and reality will have them loaded differently. The picture below reveals the variation in thickness and head angle to the swage. Reefing Line (reef 2) - Boom length x 3. To reduce the bend we had to reduce tension of the V1s but also monitor the tension of the D1s. Maintain your standing rigging! The Dyneema sizes can be the same as for the 6mm Stainless above except that the Marlow M-Rig Max (DM20) might be better in 8mm. Graham Radford Yacht Design, STABILITY DISCUSSION, total shroud breaking strength (1.2 * disp). Ill add Dynice Dux back into the pricing and options. chunkier appearance than forged parts because the internal grain of the material remains parallel, requiring some faces to be longer to retain strength. 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. 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 replace the topping lift and support the boom. For example, port upper shroud (fig 3) or forestay (fig 1). 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. Taking 70% of the lower shroud capacity gives a safety factor of 3.4. Heat stretched SK75 really performs better under a constant load. By giving the D1s a few symmetrical left-right turns we were able to straighten the lower part of the mast. This is a very inexpensive investment (by yachting standards ) to ensure that your rig is in sound condition. Everything was in order throwing in a few tacks confirmed that the boat made sailed the same angle to the wind on both tacks. https://www.ebay.ca/itm/5-13mm-HampiKl3MW1P7_hTkTw. Since we also stand to gain when you replace your rigging, let us say that many insurance companies will not insure sailboats with aged rigging. So the rake is controlled by adjusting the stay length and the V1s. This allows us to run high and increase mast bend with a full mainsail. A high-performance racer might require a lighter, stronger, lower stretch (i.e. Designers typically specify standing rigging and attachments, including bolts, that are 1.3 to 1.4 times stronger than the calculated load. Search by manufacturer's part # or brand. says the wire was 1/4". Boat Design Net does not necessarily endorse nor share the view of each individual post. Each mast section is fitted with wire or rod sized to accept the loads generated at that section of the spar. Therefore, with a strong breeze, we can intervened on the backstay to reduce the forestay sag and flatten the mainsail. Check the thread type (UNF or Metric) the thread size (standard or upsize) and, just to make sure, the thread direction. Using our beam load calculator. Mast and Rigging calculations | Boat Design Net Taking into account boat length and sailing style, the attached chart suggests rope diameter and type for each piece of running rigging: Rope Diameter and Type. Our calculator is easy and simple to use. Others, such as Mr. E.Sponberg, make other distribution of forces. 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. 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] ). 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. Of course what we have not been able to compare fully is the performance of Marlow vs Liros in heat treatment, pre-stretch and coatings. For example, low stretch is very important in a halyard but not necessarily in a sheet. The wire diameter Chainplates Revisited - Practical Sailor You understand that the calculator provided is for general sling length and size suggestions. The reality is that Creep, even in SK75, can easily be designed around for standing rigging on a sailboat. 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. But I have seen many badly adjusted masts and not by just a little. But these are for breaking strength of the wire. We have a huge rope wall at Rigworks and are very proud of our selection and expertise. 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. Chainplates 101: Inspect and Refit | Cruising World These guidelines are particularly useful when estimating the cost of a project. Seen from the side, the mast showed excessive rake and pre-bend that needed correcting. All standing rigging is manufactured right here in our rigging shop -- the way it's been since 1984. Plus there will be more spare strength if there is UV or Chafe damage. Staying within elastic limits gives safety factors of 2.5, 2 and 1.9 respectively. There is nothing more expensive than a cheap boat! Therefore, except in exceptional cases, starting from this assumption is more than reasonable. Creep will mean your rig needs re-tensioning over time. The boom will rise again when we tension the reef line and this rarely even needs the boom to be helped by hand. The benefits are less windage and less weight aloft. The wire is inserted into the hollow terminal and pulled through a set of roller dies. Lets consider the mast of a Class40, with two orders of swept back spreaders and its standing rigging. 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. Before tightening the forestay, however, I wanted to loosen the the V1s a little so as not to induce further compression in the mast. There is no one-size-fits-all with running rigging. While I would love to buy Marlow as a British company, they are a lot more expensive. One other very important comment on sizing for creep: Material creep is a function of length, long sections will have more creep than short sections. Replacing your turnbuckles. The Pogo 2, designed around 2003-2004 is the Mini 650 with most boats built. only available on wire up to 6mm diameter, because larger diameters are not flexible enough to turn around the tight radius of a thimble without detrimental deformation, the most economical method for professional wire termination, Ideal for fittingonto oversized pins andattachment points with the additionofa stainless steel thimble, can also be used to form a loop for masthead attachment. For a rod of the size we were adjusting we needed a large and very expensive tension measurement tool. These are boats where you usually an average setting and not touch it before a specific event. With a bent mast the first thing really is to understand was why it is so. Replacing Your Rigging | Cruising World Whats up? The spreaders are not perpendicular to the fore-aft axis but swept towards the stern on the horizontal plane. This explained why the head of the mast pointed to the left after the initial bend. 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. 1/4" is usually 7/16" or 1/2". The checkstay, on the other hand, usually points where the foresail forestay attachment is located. 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). Like your car, your sailboat needs TLC. N.B Selden T terminals are a similar size and shape to the Hasselfors Flat Head design. Do it yourself Standing Rigging Quotes - Jimmy Green If it does not rotate, spray some WD40 but never twist the rod rigging. 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. Check your spreaders, chainplates and turnbuckles for cracking, fatigue, missing cotter pins/rings, etc. 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. But without mast height I suppose this is only partly covering the shroud angle issue? You can use a large nail or screw on the dock. Load Calculator - Stren-flex Stainless Steel Wire Rigging and Wire Rope, Guard Wires, Guardrails and Guardrail Webbing, Replacing your Standing Rigging - a step by step guide, Sta-Lok Rigging Terminal Fitting Instructions, Why choose Compacted Strand for your Standing Rigging, Stainless Steel Wire - Quality Control and Care, Stainless Steel Wire Break Load Comparison, LIROS 3 Strand Lashing, Lacing and Lanyards, LIROS Braided Lashing, Lacing and Lanyards, Running Rigging Rope Fibres and Construction Explained, Dyneema Rope - Cruising and Racing Comparison, Running Rigging - LIROS Recommended Line Diameters, Running Rigging Break Load Comparison Chart, Selecting the right type of block, plain, roller or ball bearing, Custom Build Instructions for Sheets, Halyards, Control Lines, Comparison and Review of Dyneema Soft Attach Low Friction Ring Products, Bending and Hoisting Methods for Sailing Flags, Courtesy Flags Identification, Labelling and Stowage, Glossary of Flag Terms and Parts of a Flag, Petersen Stainless - Upset Forging Information, Thimble Dimensions and Compatible Shackles, Guard Wires - Inspection and Replacement Guidance, Webbing Jackstays - Custom Build Instructions, Danbuoy Instructions - 3 piece Telescopic - Offshore, Man Overboard Equipment - World Sailing Compliance, Safety Marine Equipment List for UK Pleasure Vessels, Helly Hansen Mens Jacket and Pant Size Guide, Helly Hansen Womens Sailing Jacket and Pant Size Guide, Clearance 1kg Automatic ABC Dry Powder Fire Extinguisher, August Race eco-Shotz - Boat Cleaning Kit, Clearance A5 Polyform Heavy Duty Buoy Fender, Strap Toggle - also known as a Toggle Fork, development of the fixed fork - features a transverse bar withan articulating fork attached- for attachment to a mast plate with a hole drilled through it, also known as a mast tang, Shackle Toggle - development of the simple eye featuring a permanently attached D shackle- for attachment to a mast tang. Write down the number and move on to the next stay. With a masthead rigged boat, the backstay can be used to increase forestay tension in high winds. 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. Lift-All makes no guarantees that the information provided in the calculator is correct. Differences emerged immediately, the D1 on the left was about 1cm shorter than the one on the right. This will be true for all three of your reef points. After attempting to sort through the many personal. Can you break it down for me? 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. Boom Vang - Boom length x 2. 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. Of course, you are welcome to label all your rigging, pack it up and send it to us to replicate.If you live near enough, you can bring the rigging yourself and discuss it with our Rigging team, it will be well worth the trip :-). document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. By now, I would say, even on cruising boats it is one of the most common rig arrangements. Check the thread size (standard or upsize) Select a turnbuckle which provides articulation e.g. Im least concerned about Constructional Stretch or bedding in. Want to prolong the lifespan of your rigging? Each complete turn corresponded to approximately 3-4 millimetres in length. Sizes .172 to .375 and 4.4mm to 9.5mm. This post has taken an age to research and write. This system with T-bone on the checkstay give you maximum flexibility and is obviously suitable for those who know how to use it. Stainless Steel Wire Rigging and Wire Rope - Jimmy Green Does anyone know if 5/32" is the factory size? Yes, doing it yourself will theoretically save money. That said, they play a very important role they help provide additional support for the mast. Rig designers will calculate the optimum length of the unsupported lengths, or . This is possible because the rod shroud is free to rotate inside its T-Cup at the spreader. Then we choose what percentage of the breaking strength of the Dyneema we want this to be. RIMAST - Masts and Riggins Calculations The pre-bend, at a given a setting of the V1s, is controlled by the tension of the D1s and D2s. Beam Load Calculator The boat was in the water, we first had to avoid the risk of unscrewing a turnbuckle and accidentally unhooking a shroud. For a C&C 115, making the mast out of carbon and going with somthing other than SS wire, save IIRC from a magazine article. Simple. Lower Fore St, Beer, East Devon, EX12 3EG. 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. How to calculate the necessary support under a crane A DIY Solution to Tired Standing Rigging - Sail Magazine This is the same both on Mini 650s and on Class40s. Continuous rigs require fewer terminal fittings which reduces costs and allows for easier inspection of terminals. One area still to be worked out is how much length to allow for creep. After this introduction, lets move on to a practical case. 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 original spec. We had created a perfectly straight mast track, an adequate rake and a pre-bend. So, in order to avoid any dangers, we set the inner forestay (to double up with the forestay). The Bluewave turnbuckle (bottom) is for racing enthusiasts who want to easily adjust settings on the water. Global Solo Challenge Copyright 2022. be exactly level with the same number of turns on the upper and lower par. A rig inspection beforehand can minimize surprises. Suddenly you run the risk that with enough wind the checkstay could even cause the mast to reverse its curvature with the masthead going forward and the lower part held back by the tight checkstay. Our riggers can also tune your rig, either at the dock or under sail. Speaking of standing rigging we have to open a parenthesis on the types of rigs possible for a sailboat. 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. This was not the case before, with a perceptible difference of several degrees. Required fields are marked *. Then it made a bend to the right and then back to the left between the second set of spreaders to the masthead. Can Galvanised Steel be used with Stainless Steel? Forged:Some Petersen Stainless terminals are manufactured using a process known as electrical upset forging.The electrical current used internally aligns the grain structure of the stainless steel.The result is a stronger, lighter fitting that is also more resistant to loading fatigue.The picture shows a machined eye (top) which is slightly larger than the relatively minimal forged eye (bottom) for the same size wire. This is our highest recommendation to make sure your rig fits properly. We deal directly with the manufacturers of the sailboat standing rigging components that we sell, and we know the product because we use the product. However, in long race, especially single-handed, offshore, it has some human contraindications. We have chosen a Class40, a sister-ship of the boat with which I competed in the Global Ocean Race 2011/2012. You're right (I need to think about). only hand tools are required for installation, can also be completely disassembled and reused (some models require inner cone replacement) providing great longevity, can be manufactured to very precise tolerances, the waste material can be recycled to create further parts. On a Mini 650, to avoid too many lines, and with a boom that weighs a few kilos, nothing replaces the topping lift. I'm a little confused. If your rigging terminal contains a pin remove the pin and use this as your attachment point. Replacing your turnbucklesCheck the thread size (standard or upsize)Select a turnbuckle which provides articulation e.g. The most popular choice is the Stalok version (top) which utilises a chrome-plated, forged bronze body. Despite the absence of a backstay its not runners or checkstays that keep the mast up. Taking V1s and D1s and shaking them, hitting them, you get a feel for their. Once on deck I noticed that the mast was much better already, the forestay was tighter, even though we hadnt touched the V1s at all. 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. When measuring rigging, the convention is to measure from pin center to pin center or from bearing point to bearing point. This type of rig, nine tenths fractional, has two orders of spreaders. 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. I replaced 3/16 rigging with 5/16 dynex dux and it's still ok after 10 years. Re-rigs - Petersen Custom Rigging 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. I wish the rope companies made the creep properties easier to find. 50 or so lbs up in the air, which translated to 200 less rail meat lbs! If you cut heat stretched SK90 or 99, you will get 12 strands that fall apart. Raise then the equations of equilibrium will be more easy task. Those methods give a guide to sizing the wire for the 10M. It is important to use a tape measure under tension and that does not stretch. This is mostly a problem if you only use turnbuckles due to their limited range. If your design includes lashings (which are normally setup to have plenty of adjustment) then there is only the inconvenience of a tightening a few times initially if you didnt get rid of all the constructional stretch. Rigging Math | SailNet Community They make the information from manufacturers such Marlow rather more accessible. In fact, if the D2s had been too soft, when tightening the checkstay the mast would bend to windward. Add that amount for each splice (it won't amount to even 36 feet in either case), plus the distance around the thimble. Its a popular model of Class40, a first generation Akilaria RC1, designed by Mark Lombard, from around 2006. Remove any pins from your terminal ends before taking measurements. Standing rigging: step by step guide on how to tune it on your sailboat From the Rigger: First, if your old rope served its purpose but needs replacing, we recommend duplicating it as closely as possible Read more, http://rigworks.com/maintaining-your-standing-rigging/, http://rigworks.com/wp-content/uploads/2016/03/Standing-Rigging-Care.pdf, http://rigworks.com/the-scoop-on-rig-inspections/. On a boat like yours with single uppers and double lowers, the uppers see about 45% of the load and . This development has become more and more marked with boats with very wide spreaders and without backstay. Member Album by TANSL | Boat Design Net https://www.boatdesign.net/gallery/albums/member-album-by-tansl.4186/, TANsl https://www.boatscantling-iso-12215.net/, (You must log in or sign up to reply here.).