The distance between the hole and the top of the fitting - check that the new fork fitting has enough depth to accommodate the chain plate without obstruction. Save my name, email, and website in this browser for the next time I comment. Lets consider the mast of a Class40, with two orders of swept back spreaders and its standing rigging. On some boats a loop with T-bone is is used to shorten the checkstay lashing by a few centimetres. Taking the upper and a single lower of 5/16" gives a safety factor of 3.1. 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. Our calculator is easy and simple to use. This will certainly lead to creep issues and probably re-splicing if you use turnbuckles. The standard seems to be 2.5 to 3.0. The curve to starboard between the first and second set of spreaders was attributable to the upper diagonal D2 on the starboard side, which was tighter than the left one. The checkstay, instead, was tied to the first pulley with a lashing so that it could be adjusted in length. From them we get either 7 or 9mm for the Mizzen and 11mm for the main. I will analyze your calculations carefully. 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 Hamma Spoon and Petersen Shroud terminals are designed as direct replacements for the discontinued Navtec T-terminal. Effect of angle on capacity. I have a 1988 Catalina 22'. 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. Of course, you are welcome to label all your rigging, pack it up and send it to us to replicate.If you live near enough, you can bring the rigging yourself and discuss it with our Rigging team, it will be well worth the trip :-). Using a fiberglass or steel tape measure, measure the distance from pin-center to pin-center or bearing point to bearing point as applicable. This yields a shroud load of 6,000 pounds. This especially with loose D2s that do not prevent the section above from bending forward. We always look forward to seeing you! The picture below reveals the variation in thickness and head angle to the swage. This App is a tool that facilitates the calculation of basic rigging, weights of different profiles, and centers of gravity of composite loads. At first, you will only see fields for two loads (Load 1 and Load 2), but once you enter a value for \small x_2 x2, the fields for Load 3 will show up . For example, port upper shroud (fig 3) or forestay (fig 1). A change of about 1.5cm that was well noticeable at a height of 20 meters. RIGGINGS AND MASTS CALCULATIONS ONLINE RIGGINGS AND MASTS FREE DATABASE: Just in 10 minutes! This type of rig, nine tenths fractional, has two orders of spreaders. I ran the numbers for the 10M by methods from three sources starting with David Gerr's book "The Nature of Boats." That has two ways of calculating the size. 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. Check your spreaders, chainplates and turnbuckles for cracking, fatigue, missing cotter pins/rings, etc. 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. We are confident that you will look forward to our emails. When the T-bone is undone, the runnner has more relative tension than the checkstay as by undoing the T-bone we have effectively lengthened the checkstay. Sizes .172 to .375 and 4.4mm to 9.5mm. 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. Maybe I was being a bit hyperbolic when i said that dude was 3x the amount of competitors. Boom Vang - Boom length x 2. Check that everything is straight and true. 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). The goal is to give the mast a beautiful shape that does not have strange kinks in its curvature and especially any inversions etc. Be aware that this is not a simple conversion and can be quite expensive. 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. Taking 70% of the lower shroud capacity gives a safety factor of 3.4. This is because upwind mast is fully loaded at just 15-16 knots after which you need to reduce sail. 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. Get the full sizing and inventory of: - the standing rigging - the running rigging - the mast section with weight and size - gravity center localization - and mast tuning report 4. The numbers in the Toss and Henderson calculations were for a 2.5 safety factor. Others, such as Mr. E.Sponberg, make other distribution of forces. All standing rigging is manufactured right here in our rigging shop -- the way it's been since 1984. If these are too soft the mast will sag to leeward between the first spreader and masthead. Could someone please speak of the advantages / disadvantages of increasing the. So these are the sites Ive found most useful in working sizes for our boat. One seemingly easy option is to over-size. 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. The curvature was accentuated between the first spreaders and the masthead so I went up to the D2s to give a first rough and symmetrical adjustment. Know the sizes and lengths you need? Forum posts represent the experience, opinion, and view of individual users. All you have to do is input the span of the beam, the magnitude of the point loads, and their distances from support A. Most lines are pre-stretched. So you cant simplify this by saying to keep the working load below a certain percentage of break strength. We have also said that the mast of a Class40 is not quite so bendable and adjustable. What does all this mean? Jimmy Green Marine commonly supply 3 types of rigging screw for standing rigging.These are sometimes referred to as bottle screws or turnbuckles. We repeated the exercise for the low diagonals D1s. A customer came into our shop the other day to discuss his 33-year old rigging. You may need to apply pressure to stretch the wire straight, you may find it helpful to use a line or block and tackle. Our riggers can also tune your rig, either at the dock or under sail. The Bluewave turnbuckle (bottom) is for racing enthusiasts who want to easily adjust settings on the water. 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. And yet I have read that once stretched to its working load, regular Dyneema will stabilize and then experience even less creep than DUX. These guidelines are particularly useful when estimating the cost of a project. Both operations improve upwind performance. The spring-loaded ones suitable for adjusting the shrouds of a Mini 650 are useless. I.e., that the problems were only in the adjustments of the turnbuckles. 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. If in doubt, get a professional opinion. The boom will rise again when we tension the reef line and this rarely even needs the boom to be helped by hand. 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? Replacing your turnbuckles. This turnbuckle features calibration, one extra-long stud and a fold-out arm to facilitate easy adjustments. The boat was in the water, we first had to avoid the risk of unscrewing a turnbuckle and accidentally unhooking a shroud. 119 316 grade stainless steel Wire Rope (1 group of 19 wires, very stiff with low stretch) is standard on most sailboats. Stretch the wire straight and ensure there are no bends in the wire. Having worked and checked with runners and checks the sea trial was more for the pleasure of ending the day with some sailing. 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. Keeping your existing turnbucklesCheck the thread type (UNF or Metric) the thread size (standard or upsize)and, just to make sure, the thread direction. The fittings and wire gradually reduce in size going up the mast as the loads decrease. 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. https://www.ebay.ca/itm/5-13mm-HampiKl3MW1P7_hTkTw. This is mostly a problem if you only use turnbuckles due to their limited range. When I arrived on this boat to check the mast, there were two problems noticeable with the naked eye. Why not schedule annual service as you would with a car? The Lift-All Sling/Leg Length Calculator has been designed to assist you in selecting the appropriate size slings for your lifting applications. All rights reserved. You understand that the calculator provided is for general sling length and size suggestions. For example, assume a 2,000 pound load is to be supported by 2 legs of a sling. I need to ensure that the lashing length is enough for me to still tension the shroud at the end of its life. Thanks, very interesting and helpful. Check the thread type (UNF or Metric) the thread size (standard or upsize) and, just to make sure, the thread direction. The reality is that Creep, even in SK75, can easily be designed around for standing rigging on a sailboat. 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. Remove any pins from your terminal ends before taking measurements. Swaged terminals are manufactured using 1 or more of the 4 processes listed above. If you are in any doubt about replicating your existing T terminals, please take some close-up photos with dimensions - the width, shoulder length and overall depth of the T shape. But have you ever seen a boat so rigged? I would suggest using larger than 1/4" dyneema. 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. We will talk here specifically about boats with swept back spreaders. 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. They have been very helpful in responding to email enquiries. Creep will mean your rig needs re-tensioning over time. The standing rigging is all rod on this boat. The bend instead arises from compression of the mast given by the tension of the V1s, these pull down the mast that bends forward. From the Rigger: Lets play Name that Stay Forestay (1 or HS) Read more, Question: Do you have guidelines for selecting halyards, sheets, etc. 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. Unstep the mast and remove the rigging from the boat. Lets be very conservative and assume we are looking at existing stainless 6.5mm for the mizzen and 8mm for the main (will check as soon as we are allowed to visit the boat). Once you know the diameter of the wire, it will give you the load both in kg and as a percentage of its breaking strain. Looking at the Jimmy Green table for all the Dyneema they sell we find that 7mm is good (except Liros dont sell 7mm so it has to be 8mm for the Liros D Pro Xtr [SK99] or 10mm for the Liros D Pro Static [DFM20] ). Lets go up whenever there doubt. The Supajust Eye Toggleand Swage (bottom) is a high specification stainless steel open body turnbuckle. We use the highest quality standing rigging components available, and we won . The Pogo 2, designed around 2003-2004 is the Mini 650 with most boats built. My understanding is if you allow for this and pre-stretch your stays you can reduce the need for re-splicing. These additions add up quickly and affect the cost of parts, labor, special order shipping, taxes, 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. 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. All rights reserved. With a fractional rig they provide extra support, and become partially structural in reducing the workloads of the last part of the mast not reached by the shrouds. This means that when the main halyard is released, the boom falls onto the coach-roof. ). Their sizing post is Sizing for Creep. Required fields are marked *. If your rigging includes a shackle with a captive pin, the inside edge of the pin is the bearing point. Imagine bearing away, removing the genoa and hoisting a large spi. Stainless Steel Wire Rigging and Wire Rope, Guard Wires, Guardrails and Guardrail Webbing, Replacing your Standing Rigging - a step by step guide, Sta-Lok Rigging Terminal Fitting Instructions, Why choose Compacted Strand for your Standing Rigging, Stainless Steel Wire - Quality Control and Care, Stainless Steel Wire Break Load Comparison, LIROS 3 Strand Lashing, Lacing and Lanyards, LIROS Braided Lashing, Lacing and Lanyards, Running Rigging Rope Fibres and Construction Explained, Dyneema Rope - Cruising and Racing Comparison, Running Rigging - LIROS Recommended Line Diameters, Running Rigging Break Load Comparison Chart, Selecting the right type of block, plain, roller or ball bearing, Custom Build Instructions for Sheets, Halyards, Control Lines, Comparison and Review of Dyneema Soft Attach Low Friction Ring Products, Bending and Hoisting Methods for Sailing Flags, Courtesy Flags Identification, Labelling and Stowage, Glossary of Flag Terms and Parts of a Flag, Petersen Stainless - Upset Forging Information, Thimble Dimensions and Compatible Shackles, Guard Wires - Inspection and Replacement Guidance, Webbing Jackstays - Custom Build Instructions, Danbuoy Instructions - 3 piece Telescopic - Offshore, Man Overboard Equipment - World Sailing Compliance, Safety Marine Equipment List for UK Pleasure Vessels, Helly Hansen Mens Jacket and Pant Size Guide, Helly Hansen Womens Sailing Jacket and Pant Size Guide, Clearance 1kg Automatic ABC Dry Powder Fire Extinguisher, August Race eco-Shotz - Boat Cleaning Kit, Clearance A5 Polyform Heavy Duty Buoy Fender, Strap Toggle - also known as a Toggle Fork, development of the fixed fork - features a transverse bar withan articulating fork attached- for attachment to a mast plate with a hole drilled through it, also known as a mast tang, Shackle Toggle - development of the simple eye featuring a permanently attached D shackle- for attachment to a mast tang.
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