standing rigging size calculator

The fittings and wire gradually reduce in size going up the mast as the loads decrease. 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. Having to remember this T-bone day and night in every situation is not the best of proposition. 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. So 716 * 30 gives an RM30 of about 21,500 lbs. be exactly level with the same number of turns on the upper and lower par. 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. Both are based on the this formula: RM30 is the righting moment at 30 degrees heel The overall shroud load is divided up between your shrouds. That said, runners and checks play a very important role in stabilising the mast and reducing its stress. With the D2s completeley loose, the D1s were obviously too soft too. The Pogo 2, designed around 2003-2004 is the Mini 650 with most boats built. a toggle fork at the bottom end. At the same time, by vertical compression of the mast, tensioning the backstay causes a bending of the mast that flattens the main. Good question. I'm not sure that the distribution of the force on the sail, in force at the top and on the boom, is correct. On some boats a loop with T-bone is is used to shorten the checkstay lashing by a few centimetres. 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? 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. For an idea of the costs involved to replace your standing rigging, here are some examples of sets of rigging we have made for customers in the past 12 months (prices as of Sept 2022). Not only will your rig last longer when properly tuned, your boat will sail better, and who doesnt love that! 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. We wont be re-rigging the main until after the 2021 season so have plenty of time to measure properly. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Dont trust us for the sizing of your own rig! Choose the profiles, suppliers and materials from the database 3. They are not included in our estimate. Seen from the side, the mast showed excessive rake and pre-bend that needed correcting. The influence of forestay-V1 and D1 on the bend of the mast up to the first spreader. But I have seen many badly adjusted masts and not by just a little. A high-performance racer might require a lighter, stronger, lower stretch (i.e. - MyR: software for the calculation of masts and rigging. standing rigging size calculator - jusben.com Before tightening the forestay, however, I wanted to loosen the the V1s a little so as not to induce further compression in the mast. Lift-All makes no guarantees that the information provided in the calculator is correct. Boom Vang - Boom length x 2. I am not aware of any such cases among Class40s. 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. As we go through the sizing calculations comparisons are difficult as they dont use the same version of Dyneema. We will talk here specifically about boats with swept back spreaders. The wire is inserted into the hollow terminal and pulled through a set of roller dies. For a -inch turnbuckle with a -inch toggle, the chainplate should be at least inch thick. Take your measurements from pin center to pin center as seen in the diagram. He is the engineering, construction and project management specialist company's chief rigging engineer. The Gerr method seems to go a bit smaller but all of them are smaller than the OEM rigging on the 10M. 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. Tapped and Formed:Some Swage and Swageless terminals are made of several components.These partsmay be tapped together like the strap toggles below. 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. 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. Those details about the differences of heat stretching at Fibre vs braided level are hard to come by. Search by manufacturer's part # or brand. With this expedient you can shorten the checkstay relative to the runner to the point that you set the checkstay and the runner remains effectively loose. A DIY Solution to Tired Standing Rigging - Sail Magazine That is, if the D1s are too tight and the V1s too, we can even force in an inverse curvature. says the wire was 1/4". Standing Rigging - Cable Loft But have you ever seen a boat so rigged? iPhone. 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. Usually they are made with dyneema and not just simple polyester. Each complete turn corresponded to approximately 3-4 millimetres in length. Hey all, I'm going to do my standing rigging myself with Dyneema using thimbles and dead eyes. In addition to this it was clear that when the starboard runners and checkstay were tensioned, the mast deteriorated in shape. Tensioning the backstay, the central part of the mast advances forward creating a slight C shape of the mast seen from the side. Running rigging - SailboatOwners.com I see DSM is coming out with DM20 which is a heat treated pre stretched fiber. Not forgetting the compression loads from the stays too. I found the Colligo information less helpful, it feels to me that they have stayed with the same materials despite the new developments. 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. The standing rigging is all rod on this boat. The cost to replace standing rigging obviously varies from boat to boat. So you cant simplify this by saying to keep the working load below a certain percentage of break strength. Since you're doing lashings, an inch either way won't matter: what's more important is cutting all your lowers the same length so the deadeyes all line up and look symmetrical. What does all this mean? Using Colligo's stretch calculator it looks like I should go with 5/16 and 1/4" Dyneema respectively. Looking at the mast from the side you could see a beautiful shape without irregularities that gently curved back. 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. This is a very inexpensive investment (by yachting standards ) to ensure that your rig is in sound condition. Therefore, except in exceptional cases, starting from this assumption is more than reasonable. This T-bone, if forgotten closed, supports the mast only at the level of spreaders, leaving the masthead free. On boats with swept back spreaders, runners and checkstays are not structural. In terms of suitability for us, we have got that down to this list of basic Dyneema variations (we havent found a comparison between the different ways of treating the same type of Dyneema): Rigging Doctor describes all these (and others that we are not considering), not much has changed since that was written in 2015 apart from the gradual introduction of Bio-based Dyneema (expected to reach 60% of all Dyneema by 2030) and a reduction in the premium pricing for DM20 and SK99. To fix a mast like this, with multiple problems, you need to have a method to get to a satisfactory result. Despite that, they do all agree that Dyneema needed to be sized for Stretch rather than for Strength. As we were stationary in port and without sails, I could totally ignore the D2s until the end. Find a flat surface large enough that you can fully stretch your rigging out for measurement. So, with or without your old rope in hand, stop by and chat with our staff. Unfortunately lots of the information isnt clear about which they are referring to in their guidance. The Dyneema sizes can all be 10mm except the Liros D Pro Static [DFM20] which would need to go upto 12mm (no 11mm available). As mentioned, runners can be used in different ways. And they often find badly damaged Read more, Question: When your riggers talk about standing rigging, they often use terms I dont recognize. 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. 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. That is, it is no longer one of the elements of the standing rigging (albeit adjustable). Threaded Bronze Inserts ensure superb adjustment without seizing or galling and the swivel toggle action allows full articulation in two planes. The best bet is to shop with your old rope in hand. With a masthead rigged boat, the backstay can be used to increase forestay tension in high winds. Beam Load Calculator 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. Does anyone know if 5/32" is the factory size? 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). There isnt even a topping lift to support the boom when reefing. Label all wire segments indicating their position. As a side note, alot of people have miss-diagnosed constructional elongation for creep. Of course, a number of factors affect a rigs lifespan including load, sailing conditions, mileage sailed, age, fatigue from cyclic loading, environmental influences such as salinity and contamination, and frequency of care and maintenance. If your standing rigging does not match our diagram, or has been modified, then the quoted price is not applicable to your boat. One of the most frequently asked questions we hear is: How do I measure my sailboat standing rigging? 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. This can be measured by hanging a full bucket of water on the main halyard and letting it hung just above the deck. Check the thread type (UNF or Metric) the thread size (standard or upsize) and, just to make sure, the thread direction. Calculate the length of bury. This is why Marlow recommends DM20 for standing rigging, even though the elastic stretch in DM20 is so much more. Website created by. I could measure the rake with a bucket, but I had somewhat of a historical memory of the setting of that mast. Do it yourself Standing Rigging Quotes - Jimmy Green 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.

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