This is why Marlow recommends DM20 for standing rigging, even though the elastic stretch in DM20 is so much more. 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. 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). It was clear, however, that we had moved the mast head forward several centimetres and the excess rake was gone. 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. This explained why the head of the mast pointed to the left after the initial bend. Replacing Your Standing Rigging - RIGWORKS INC. On boats with swept back spreaders, runners and checkstays are not structural. Their role is not simply to contain the main when dowsing it. We forego some fine tuning for safety offshore. 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. This allows us to run high and increase mast bend with a full mainsail. Below are some rough guidelines to help you make an educated purchase. A change of about 1.5cm that was well noticeable at a height of 20 meters. Spinnaker Sheet / Guy - Boat length x 2. says the wire was 1/4". 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 backstay is both an element of the standing rigging but can also be tuned. Z-Spars, Isomat.Opposite UNF thread is very rare and will entail changing the whole turnbuckle to avoid a bespoke solution. But I mean, why dont hey have prices listed on their site?! Chainplates Revisited - Practical Sailor 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). Tapped and Formed:Some Swage and Swageless terminals are made of several components.These partsmay be tapped together like the strap toggles below. So I'm interested in your opinions. Thanks John. Whats up? This type of rig is fitted with a runner at the mast top and a checkstay at the height of the inner forestay. A customer came into our shop the other day to discuss his 33-year old rigging. 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. 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). If they are both too tight the mast becomes straight like a telegraph pole losing its beautiful shape. Not forgetting the compression loads from the stays too. Here are a few suggestions. This yields a shroud load of 6,000 pounds. How To Identify and Specify Your Standing Rigging Components - Jimmy Green 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 port V1 was 2cm shorter than the starboard V1. You're right (I need to think about). In addition to this it was clear that when the starboard runners and checkstay were tensioned, the mast deteriorated in shape. I therefore decided to tighten further the D1s by a turn and the D2s by two. I could measure the rake with a bucket, but I had somewhat of a historical memory of the setting of that mast. 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. My personal opinion is that when offshore racing it is best to avoid easily avoidable risks. With a masthead rigged boat, the backstay can be used to increase forestay tension in high winds. I hear about these guys on every forum everywhere. All in all it will probably only change your solent to staysail switch point by a knot of wind or two. Our calculator is easy and simple to use. Question: My halyard is binding. 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. - MyR: software for the calculation of masts and rigging. 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. After attempting to sort through the many personal opinions on appropriate wire size for Atticus, Jordan decided to study up on the scantling equations for mathematically determining for ourselves the safest yet most economical size for our rig. The direction of the thread is only of vital importanceif you are planning to change the stud terminal, but keep the existing turnbuckle.Take a close look at the two different threads in the picture below.Thehigher sidedenotes thedirection of the thread. Driscoll Boat Works and Shelter Island Boat Yard are both within walking distance of Rigworks. 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. 5 languages options can be chosen: English, Spanish, French, German and Portuguese. The Bluewave turnbuckle (bottom) is for racing enthusiasts who want to easily adjust settings on the water. If your running rigging leads back to the cockpit . Jusben Engineers is a major B-BBEE engineering, construction, and maintenance contractor, delivering complex . 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? 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. Keeping your existing turnbucklesCheck the thread type (UNF or Metric) the thread size (standard or upsize)and, just to make sure, the thread direction. 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. The benefits are less windage and less weight aloft. Check that everything is straight and true. And they often find badly damaged Read more, Question: When your riggers talk about standing rigging, they often use terms I dont recognize. Having to remember this T-bone day and night in every situation is not the best of proposition. Want to prolong the lifespan of your rigging? Website created by. The tension gauges are especially designed for accurate, repeatable tuning of a sailboat's standing rigging. Label all wire segments indicating their position. 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. Shaking the furled headsail gives an idea of the tension of the forestay. 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. This was not the case before, with a perceptible difference of several degrees. 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. 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. Adjusting the rigging of a sailboat is less complicated than you imagine. How to use Tension Gauges - Loos & Company, Inc. That is with the forestay and backstay attached to the masthead as fixed standing rigging that create traction in the opposite direction. 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. We removed two more turns from the V1s and took them back at the forestay. Stainless Steel Wire Rigging and Wire Rope - Jimmy Green Hi Dave, Thanks for your very thorough synopsis of using Dyneema for standing rigging. This is the same both on Mini 650s and on Class40s. If you would like to measure your rigging yourself proceed to step 5. Is it maybe, just maybe possible that they have cornered the market on synthetic standing, Colligo, Colligo, Colligo. The mysteries of sizing Dyneema standing rigging We were thinking LIROS D-Pro-XTR (SK99) as by far the cheapest option (and as SK99 is stronger than SK78 we should have less creep than the cheapest Marlow option which is SK78). If you need to replace a halyard, please dont pull it out of the mast. Designers typically specify standing rigging and attachments, including bolts, that are 1.3 to 1.4 times stronger than the calculated load. Looking at the mast from the side you could see a beautiful shape without irregularities that gently curved back. The fittings and wire gradually reduce in size going up the mast as the loads decrease. And if in doubt, too long is always better than too short! directly with the yard of your choice. When measuring rigging, the convention is to measure from pin center to pin center or from bearing point to bearing point. It is important to use a tape measure under tension and that does not stretch. But these are for breaking strength of the wire. I have an older Hallberg Rassy 35 (yep, thats the new challenge) - and currently the rigging appears to be 5/16" wire (that's what the local rigger measured, it seemed slightly smaller to me but he probably does a better job at measurment). Once the sail was lowered and the retaining bolts were unscrewed, it was possible to raise the drum and access the forestay turnbuckle.