If your end terminal is a threaded stud measure to the end of the stud; include the length of the threaded portion, note whether it is left or right handed, and the thread size. So 716 * 30 gives an RM30 of about 21,500 lbs. As posted above it seems like synthetic standing rigging is still the wild west. To calculate the load on a particular sling leg proceed as follows: Take the total weight of the load and divide this by the number of legs supporting the load. I have to study the correct way to approach this problem. If we follow the table they include from Marlow for their DM20 line (Marlow M-Rig Max) then sizing is huge: 11 or 12mm for the Mizzen and 15mm for the main. Your email address will not be published. The rake depends on the relationship between the length of the forestay and the shrouds as a whole. The boom will rise again when we tension the reef line and this rarely even needs the boom to be helped by hand. My personal opinion is that when offshore racing it is best to avoid easily avoidable risks. Add shackles and splices from our Running Rigging Builder Is it maybe, just maybe possible that they have cornered the market on synthetic standing rigging through a, Location: Bas Caraquet, New Brunswick, Canada. They are adjustable both to raise the boom in port and to put them at rest during navigation. 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. a toggle fork at the bottom end. 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). The initial task is totake some basic measurements.A good tape measure combined with a good eye may be sufficient, but vernier scale calipers will guarantee an accurate result.Digital versions are now available at a very affordable price and they make the process very simple to read and record. 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 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. 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. Not forgetting the compression loads from the stays too. If you would like to measure your rigging yourself proceed to step 5. Our preferences are going to be to tune the rig for a bit higher performance and sail a bit harder than they do but it is still be best source of information we have found. Continuous rigging is more common on older and more traditionally rigged boats, while newer boats and performance-oriented sailboats often have discontinuous rigging. Standing rigging definition, rigging remaining permanently in position as a means of steadying various spars, shrouds, stays, etc. On some boats a loop with T-bone is is used to shorten the checkstay lashing by a few centimetres. For more information on rig inspections, visit our prior Ask the Rigger article at http://rigworks.com/the-scoop-on-rig-inspections/. 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). This T-bone, if forgotten closed, supports the mast only at the level of spreaders, leaving the masthead free. Diameter and performance are determined by your boat length, the function of the rope, and the style of sailing that you do. With a masthead rigged boat, the backstay can be used to increase forestay tension in high winds. Condition of sling - passes all inspection criteria. Lift-All makes no guarantees that the information provided in the calculator is correct. Everything was in order throwing in a few tacks confirmed that the boat made sailed the same angle to the wind on both tacks. This characteristic of heat stretched SK75 is indeed the reason that Hampidjan is still using this old chemistry of Dyneema and not moved on to the new stuff. chunkier appearance than forged parts because the internal grain of the material remains parallel, requiring some faces to be longer to retain strength. Each mast section is fitted with wire or rod sized to accept the loads generated at that section of the spar. So the rake is controlled by adjusting the stay length and the V1s. This is the figure I used in the formulas below. I have a 1988 Catalina 22'. special care should be taken to ensure that there will be sufficient material left on the tang/eye/plate if youintend toenlarge any holes. 1/2beam is half of the shroud base width In our search we have found three sites particularly helpful. This on a mast with two sets of spreaders. A high-performance racer might require a lighter, stronger, lower stretch (i.e. Not only will your rig last longer when properly tuned, your boat will sail better, and who doesnt love that! This especially with loose D2s that do not prevent the section above from bending forward. 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. The forestay turnbuckle in this case, and like on many other boats, was inside the furling drum. Spinnaker Sheet / Guy - Boat length x 2. Our riggers can also tune your rig, either at the dock or under sail. It is your responsibility to assure that the slings you use are appropriate for your application. The goal is to give the mast a beautiful shape that does not have strange kinks in its curvature and especially any inversions etc. We progressively lengthen the checkstay lashing until we get to a setting where, when tightening runner and checkstay there is a similar tension on both. That said, runners and checks play a very important role in stabilising the mast and reducing its stress. This explained why the head of the mast pointed to the left after the initial bend. I have a ketch with 1/4" SS on the main and 3/16" on the Mizzen. Runners attachments seen from the mast top Although the mast is made of carbon rather than aluminium, the rig is the same as that of a Mini 650 Pogo2 from Structures shipyard. N.B Selden T terminals are a similar size and shape to the Hasselfors Flat Head design. Shaking the furled headsail gives an idea of the tension of the forestay. All the vertical tension turned into compression and bend. Get regular rig inspections! For example, for ocean-crossing boats, runners and checkstays help stabilise the mast and prevent it from pumping or bending. 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. So I am going to be adding Hampidjan DynIce Dux into my calculations and it is cheaper than the LIROS D-Pro-XTR, plus available in more sizes. The current shrouds are 5/32" diameter. The original spec. For example, assume a 2,000 pound load is to be supported by 2 legs of a sling. Stretch the wire straight and ensure there are no bends in the wire. 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. The swept back spreaders ensure that the mast can stand up even without the backstay, which is no longer structural. 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 meant that the V1s tension encountered no resistance to mast compression. Rust and discoloration can indicate the location of a crack or crystallization of the metal. Add splices, shackles, and whipping with a single click. Check the thread type (UNF or Metric) the thread size (standard or upsize) and, just to make sure, the thread direction. You can use the righting moment and rig geometry to calculate rig loads. I jibed without runners in 50 knots of wind and nothing happened. So, with or without your old rope in hand, stop by and chat with our staff. 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. Effect of angle on capacity. Staying within elastic limits gives safety factors of 2.5, 2 and 1.9 respectively. NE ropes has STS-HSR. First, we multiply the load by 1.5 to approximate the rest of the righting moment beyond 30 degrees, and divide by half of your 10-foot beam. There is nothing more expensive than a cheap boat! Search by manufacturer's part # or brand. Question When should I replace my standing rigging? As a side note, alot of people have miss-diagnosed constructional elongation for creep. https://www.ebay.ca/itm/5-13mm-HampiKl3MW1P7_hTkTw. We wont be re-rigging the main until after the 2021 season so have plenty of time to measure properly. for my sailboat? If you cut heat stretched SK90 or 99, you will get 12 strands that fall apart. The line denotes the measurement point used bythe Jimmy Green Rigging Team. If your standing rigging does not match our diagram, or has been modified, then the quoted price is not applicable to your boat. If you are replacing your turnbuckles, make sure the existing turnbuckles are adjusted to their normal set position for sailing before taking your measurements. Tapped and Formed:Some Swage and Swageless terminals are made of several components.These partsmay be tapped together like the strap toggles below. Their role is not simply to contain the main when dowsing it. Lets consider the mast of a Class40, with two orders of swept back spreaders and its standing rigging. Differences emerged immediately, the D1 on the left was about 1cm shorter than the one on the right. The Loos tension gauges take the guesswork out of cable or rod tension adjustment. After attempting to sort through the many personal. The other positive about Dynice DUX is that it is only slightly more expensive than Vectran or Dyneema, vs. PBO which is incredibly expensive. Seen from the side, the mast showed excessive rake and pre-bend that needed correcting. That is with the forestay and backstay attached to the masthead as fixed standing rigging that create traction in the opposite direction. I think that's the real problem to solve. However we had to make some assumption and one was that each pair of shrouds would be the same length. This is especially important for the forestay attachment if it is an integral part of the stemhead fitting. Add that amount for each splice (it won't amount to even 36 feet in either case), plus the distance around the thimble. First we wanted to take care of putting the mast straight and solve the problem of its excessive rake. Is it maybe, just maybe possible that they have cornered the market on synthetic standing, Colligo, Colligo, Colligo. I would suggest using larger than 1/4" dyneema. He said it looked fine. That's a little high because it's using the combined capacity of the lowers and reality will have them loaded differently. He asked Isnt the industry standard just a ploy by manufacturers to sell more wire. Excuse me the question, stays should be placed in a "free-standing mast"?. The influence of forestay-V1 and D1 on the bend of the mast up to the first spreader. From the Rigger: We are so glad you asked! 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. 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. Running Rigging Calculator All you do is select your boat model and our calculator instantly specs the size and lengths that will work for you. Decide which you want (no doubt Colligo has a guide for bury amounts of their DUX). The most popular choice is the Stalok version (top) which utilises a chrome-plated, forged bronze body. 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). I need to do some more study and number crunching. The numbers in the Toss and Henderson calculations were for a 2.5 safety factor. Unstep the mast and remove the rigging from the boat. 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. 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. 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. On this Class40 the runner was attached to the first pulley and therefore its length was a given and could not be adjusted. To preserve the left-right adjustment symmetry, we unscrewed the V1s turnbuckles two full turns each side. All in all it will probably only change your solent to staysail switch point by a knot of wind or two. The eye will serve as your pin center. For #1, you might be able to lower the keel 1/4 of an inch, depending upon the size of the boat. For 8mm stainless steel the breaking strength is 4640kg. It is indeed a complicated process in using a braided line for standing rigging. Give us a call, and we can give you a rough quote. The wire is inserted into the hollow terminal and pulled through a set of roller dies. When I run my training centre I used to say that they were not part of the standing rigging but that for good practice we would treat them as such. The first is the RM30 heeling test to calculate rig loads. Although we work closely with the boatyard during the job, you will need to negotiate yard fees (crane, mast lay days, etc.) 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. The spring-loaded ones suitable for adjusting the shrouds of a Mini 650 are useless. For an average 40-foot boat, Cockerill estimates about $100 per foot to re-rig with wire rigging ($4,000), as well as the round-trip cost to haul and launch the boat and unstep and step the rig (an additional $2,500 or so). While I would love to buy Marlow as a British company, they are a lot more expensive. Sizes .172 to .375 and 4.4mm to 9.5mm. But without mast height I suppose this is only partly covering the shroud angle issue? The port V1 was 2cm shorter than the starboard V1. There seems to be a lack of information on the web about the sizing for standing rigging. Maintain your standing rigging! Then we choose what percentage of the breaking strength of the Dyneema we want this to be. 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. I.e., that the problems were only in the adjustments of the turnbuckles. Threaded Bronze Inserts ensure superb adjustment without seizing or galling and the swivel toggle action allows full articulation in two planes. If you need to replace a halyard, please dont pull it out of the mast. 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.). Balancing the risks and benefits, at the end of the day, on my boat I decided to eliminate the T-bone and seek for a medium setting. Their page (from 2015) Before Ordering Your Colligo Dux Rigging links to a PDF table for sizing. Yes, doing it yourself will theoretically save money. The spreaders are not perpendicular to the fore-aft axis but swept towards the stern on the horizontal plane. The mast of the Class40s are, pass me the term, quite ignorant, and dont it is not about fine tuning that last half turn. We are not experts but just trying to show our thinking processes. 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. Asymmetric Spinnaker Sheet - Boat length x 2.5 to 3. From Marlow Ropes we have this: Others refer to Elastic Stretch, Constructional Stretch and Creep. One area still to be worked out is how much length to allow for creep. If you have any questions, please dont hesitate to call or email us and we would be happy to help you. Attachment to the Mast, the top terminals. The simplest and quickest way is to use a rig-tension meter, such as the Loos gauge. The tension gauges are especially designed for accurate, repeatable tuning of a sailboat's standing rigging. I can do the reverse test and see if the opposite set causes bend to leeward. 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. And PLEASE do not buy a used boat without a professional rig inspection! 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. Please read the instructions completely before you start measuring your rig. 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. How to Measure Standing Rigging 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. As a quick side note people often ask if they should switch from rod to wire rigging or vice versa during the re-rig (usually from rod to wire as rod is much more expensive per foot). 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. Their role is to prevent the mast from bending to leeward between the first and second spreader levels, especially upwind. 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 also set runners and checkstays just for safety. I wish the rope companies made the creep properties easier to find. Check the deck around the chainplates and mast for cracking and delamination. The Supajust Eye Toggleand Swage (bottom) is a high specification stainless steel open body turnbuckle. First of all, the mast was not straight, it pulled to the left until the first set of spreaders. Keeping your existing turnbucklesCheck the thread type (UNF or Metric) the thread size (standard or upsize)and, just to make sure, the thread direction. Driscoll Boat Works and Shelter Island Boat Yard are both within walking distance of Rigworks. Contrary to popular thought, a slack rig is more punishing on a hull than a properly adjusted, tight rig. 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.
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