Lay out the wire and attach one end of your wire segment to a secure fixed point. Finally, should you decide to sail with that old rigging, consider checking out the Ask the Rigger article titled Rigs Fail Are You Ready? at http://rigworks.com/rigs-fail-ready/. Boom Vang - Boom length x 2. 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. 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. The other positive about Dynice DUX is that it is only slightly more expensive than Vectran or Dyneema, vs. PBO which is incredibly expensive. My guess is 3/8". Calculating Dyneema for Standing Rigging - Cruisers Forum Ive taken the stainless breaking limits from the Marlow table off Jimmy Green (see above). So the rake is controlled by adjusting the stay length and the V1s. Having to remember this T-bone day and night in every situation is not the best of proposition. As posted above it seems like synthetic standing rigging is still the wild west. After that I went back to looking at the mast track and, no wonder, the mast was perfectly straight on the left-right axis without any curvatures. This type of rig, nine tenths fractional, has two orders of spreaders. This is mostly a problem if you only use turnbuckles due to their limited range. From the Rigger: Lets play Name that Stay Forestay (1 or HS) Read more, Question: Do you have guidelines for selecting halyards, sheets, etc. 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. When measuring rigging, the convention is to measure from pin center to pin center or from bearing point to bearing point. As we were stationary in port and without sails, I could totally ignore the D2s until the end. So in all fairness, I was trusting my eyes. The eye will serve as your pin center. This especially with loose D2s that do not prevent the section above from bending forward. So, I resorted to trusting my sensorial memory. 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. N.B Selden T terminals are a similar size and shape to the Hasselfors Flat Head design. Despite that, they do all agree that Dyneema needed to be sized for Stretch rather than for Strength. Driscoll Boat Works and Shelter Island Boat Yard are both within walking distance of Rigworks. Before tightening the forestay, however, I wanted to loosen the the V1s a little so as not to induce further compression in the mast. I ran the numbers for the 10M by methods from three sources starting with David Gerr's book "The Nature of Boats." Looking at the mast from the side you could see a beautiful shape without irregularities that gently curved back. Also Marlow describes them all and includes comparison charts. This meant that the V1s tension encountered no resistance to mast compression. RM30 is the force that is required to heel the boat over 30 degrees. We are ruling this one out for us. You can use a large nail or screw on the dock. This on a mast with two sets of spreaders. When I arrived on this boat to check the mast, there were two problems noticeable with the naked eye. They make the information from manufacturers such Marlow rather more accessible. RIGGINGS AND MASTS CALCULATIONS ONLINE RIGGINGS AND MASTS FREE DATABASE: Just in 10 minutes! And both say having lowers at least the same size as uppers is a good idea. Certainly distributing the tension between runner and checkstay greatly reduces the load of the standing rigging. Not only will your rig last longer when properly tuned, your boat will sail better, and who doesnt love that! From Marlow Ropes we have this: Others refer to Elastic Stretch, Constructional Stretch and Creep. On this Class40 the runner was attached to the first pulley and therefore its length was a given and could not be adjusted. A change of about 1.5cm that was well noticeable at a height of 20 meters. 20% is 576kg so if we size at the 10% we get 5760kg (we can simplify the calculation to looking for a Dyneema line that is at least twice the breaking limit of the stainless it replaces). Good question. Spinnaker Sheet / Guy - Boat length x 2. 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.). Know the sizes and lengths you need? Attachment to the Mast, the top terminals. Raise then the equations of equilibrium will be more easy task. Rigging size | SailNet Community On some boats a loop with T-bone is is used to shorten the checkstay lashing by a few centimetres. 1x19 Wire Rigging Stainless Steel 1x19 Wire Rope Rigging is the most popular solution for standing rigging on cruising yachts. Those details about the differences of heat stretching at Fibre vs braided level are hard to come by. 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. Catalina 22 Shroud Sizing | SailNet Community This allows us to run high and increase mast bend with a full mainsail. Choose the profiles, suppliers and materials from the database 3. [End Update]. 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. Thanks, very interesting and helpful. (If you prefer more choices, please see our Running Rigging Builder.) At Colligo Marine, we have now rigged more than 900 boats around the world with our brand of engineered standing rigging and have learned alot from this experience. In our case the mast bent too far forward and the forestay was particularly soft. While I would love to buy Marlow as a British company, they are a lot more expensive. 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. These are boats where you usually an average setting and not touch it before a specific event. 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. However, between the sites we have found at least four ways of deciding what size is needed. In this article we will deal with the tuning of standing rigging of a typical sailboat. 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. How to calculate the necessary support under a crane 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. It is indeed a complicated process in using a braided line for standing rigging. If your rigging includes a shackle with a captive pin, the inside edge of the pin is the bearing point. The price difference of the DM20 lines over SK99 or SK78 is still huge. It is adopted by shipyards such as Jeanneau and Beneteau, even for boats without oceanic ambitions. 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. Chainplates 101: Inspect and Refit | Cruising World After attempting to sort through the many personal. Threaded Bronze Inserts ensure superb adjustment without seizing or galling and the swivel toggle action allows full articulation in two planes. The reality is that Creep, even in SK75, can easily be designed around for standing rigging on a sailboat. more expensive!) That said, they play a very important role they help provide additional support for the mast. If your running rigging leads back to the cockpit . Contrary to popular thought, a slack rig is more punishing on a hull than a properly adjusted, tight rig. Forum posts represent the experience, opinion, and view of individual users. The mysteries of sizing Dyneema standing rigging I have a ketch with 1/4" SS on the main and 3/16" on the Mizzen. First of all, the mast was not straight, it pulled to the left until the first set of spreaders. For decades now, however, fractional rigs with swept back spreaders have been increasingly widespread. Atticus Update 66: Calculating wire size for standing rigging So, in order to avoid any dangers, we set the inner forestay (to double up with the forestay). Replacing Your Standing Rigging - RIGWORKS INC. Speaking of standing rigging we have to open a parenthesis on the types of rigs possible for a sailboat. In our search we have found three sites particularly helpful. 3000 # is not enough to get rid of constructional stretch, and you would need to sustain your load over time. Generating 3D hull using only picture of boat. 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. For a -inch turnbuckle with a -inch toggle, the chainplate should be at least inch thick. 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. 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. He said it looked fine. 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. There seems to be a lack of information on the web about the sizing for standing rigging. This will certainly lead to creep issues and probably re-splicing if you use turnbuckles. 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. This translates into a less dense braided product that produces more constructional elongation when put under a constant load, like pretension in your rig. increasing and consolidating standing rigging size Question: My halyard is binding. There is no backstay at all, which is common on many modern boats. Finally, the role of the D2s in counteracting or favouring the bend between the first set of spreaders and the masthead. Swaged terminals are manufactured using 1 or more of the 4 processes listed above. That is because a Dyneema line the same strength as the Stainless Steel it replaces would be too stretchy to work. Add shackles and splices from our Running Rigging Builder This means that the threads are not screwed in equally. The distance between the halyard and the mast at the boom is your rake. The very fact that the mast remained straight even when runner and checkstay were tightened gave me good confidence that I had already adjusted the D2s correctly. Mast and Rigging calculations | Boat Design Net For more information on rig inspections, visit our prior Ask the Rigger article at http://rigworks.com/the-scoop-on-rig-inspections/. The mast of the Class40s are, pass me the term, quite ignorant, and dont it is not about fine tuning that last half turn. This can be estimated with the boat's beam, ballast, draft, and displacement. 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. 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).