Question: Do you have guidelines for selecting halyards, sheets, etc. Re-rigs - Petersen Custom Rigging That said, runners and checks play a very important role in stabilising the mast and reducing its stress. My personal opinion is that when offshore racing it is best to avoid easily avoidable risks. 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. In the design of the Dyneema chaimplates I mentioned sizing them up, but of course the line is doubled so Ill use the same size for the chainplates as for the shroud/stay attached to them. Maybe the 10M is not so over-rigged as it appears. If your rigging terminal contains a pin remove the pin and use this as your attachment point. This especially with loose D2s that do not prevent the section above from bending forward. In addition, runners reach the masthead. Taking 70% of the lower shroud capacity gives a safety factor of 3.4. If I were only using turnbuckles for tensioning then I might have gone for DM20 to avoid running out of tensioning due to creep. Continuous rigging is more common on older and more traditionally rigged boats, while newer boats and performance-oriented sailboats often have discontinuous rigging. I will analyze your calculations carefully. 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. The original spec. Give us a call, and we can give you a rough quote. We've reduced the choices to a minimum to make ordering as simple as possible. This is the same both on Mini 650s and on Class40s. Two full turns lengthened the V1s by 7-8mm and the impact was visible to the naked eye. That said, they play a very important role they help provide additional support for the mast. The picture below reveals the variation in thickness and head angle to the swage. 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. We will talk here specifically about boats with swept back spreaders. The goal is to give the mast a beautiful shape that does not have strange kinks in its curvature and especially any inversions etc. From the Rigger: Most boat owners do not climb their masts regularly, but our riggers spend a lot of time up there. In our case it was evident that the port turnbuckle had many more turns than the starboard side, compared to the thread of the V1 above. The pre-bend, at a given a setting of the V1s, is controlled by the tension of the D1s and D2s. Calculate the length of bury. To fix a mast like this, with multiple problems, you need to have a method to get to a satisfactory result. On this Class40 the runner was attached to the first pulley and therefore its length was a given and could not be adjusted. Sort by: Here are a few suggestions. 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. For example, port upper shroud (fig 3) or forestay (fig 1). 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. This type of rig is fitted with a runner at the mast top and a checkstay at the height of the inner forestay. If you need to replace a halyard, please dont pull it out of the mast. A change of about 1.5cm that was well noticeable at a height of 20 meters. 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. Beam Load Calculator It is important to understand the influence of stay-V1 on the rake. That is, if the D1s are too tight and the V1s too, we can even force in an inverse curvature.