The chinese sail previously unpublished 1960 article on the junk rig by. An analysis of the sailing efficiency of the junk yacht. My goals in doing the original design work are very similar to what led annie and pete hill to choose our 34 sailing dory design to build their voyager, badger. Sailpackaravanti, an advanced fsi simulation software. The forum is a free service, and much like the free content on public radio, we hope you will support woodenboat by subscribing to this fabulous magazine. Reading up, there are a number of choices, and then once a particular design is selected, there are more choices, including sailcloth, batten material and method of attachment, and specifics of overall rigging. As a young yacht designer, in the 1960s, i did the first versions of what became a whole range of our sailing dory designs. Sailcut cad list sailcutusers archives sourceforge. I played around with free airfoil evaluation software exploring this. We believe it is the easiest to use and most productive sail design software available and integrates flawlessly with our automation process.
These direct airflow over the main part of the panels abaft the mast. Alan boswell has designed over 250 junk rig conversions for individual owners. Modern junk rigs are capable of creditable windward performance and can often outreach and outrun boats fitted with more conventional sail boat plans. Emmelene has a split junk rig, which means about a third of the sail area is ahead of the mast and formed of conic sections called jiblets. Voyager explains junk rig choice ocean navigator january.
Design and build your own junk rig is a stemtostern guide for the western sailor who wants to junk rig any hull. The junk is predicated upon sails that are fully battened, a characteristic. There you will find a wealth of information and becoming a member is well worth it. My decision to buy a chinese junk rigged schooner was shaped by several factors. Over the thousands of years in which the chinese rig has been evolving, there have been numerous variations on the theme. Toms designs typically are stayed but a lot of them are hybrid rigs, a conventional jib and 2 junk sails. At the moment i have read van loans book and have sketched up a few different sails, and am in the process of reading haslers wellknown treatise on the junk rig. Now, consider the fact that a single sail is almost always more efficient than multiple sails, then youve pretty much eaten the efficiency deficit by. Jan 01, 2003 voyager explains junk rig choice jan 1, 2003. Any sailor familiar with a marconi rig probably wont be able to hop aboard a junk rigged boat and sail it well without first practicing for a while. It is flexible enough in its design to follow the constant demand and evolution of the sail making industry.
For western sailors used to sails with a lot of draft it is hard to know when a junk sail is properly trimmed. This part discusses the split junk rig and why im excited about it. Theres probably no rig more fascinating than the junk rig. The junk rig, also known as the chinese lugsail or sampan rig, is a type of sail rig in which rigid members, called battens, span the full width of the sail and. I was already drawn to the uniqueness of the sail design and wanted a look different from most other sailboats. The original sailcut was a basic program developed by robert laine in 1978. The junk rig is a wonderful cruising rig because it is simple. Junk rigs boat building plans kits sailboats steel aluminum.
The junk rig appeals to shorthanded sailing crews for many reasons, especially because the rig reefs very easily. A modern schooner rig, with 3 cambered panels and a transitional panel in each sail, giving an extra batten in the heads of the sails to better support them in heavy. The junk rig has been used for its safe easily handled single handed qualities and the design has been set up so that virtually all operations are controlled from the security of the doghouse. Hello i was wondering are there any problems with useing junk rig sails i believe i read somewhere that james wharram does not like this rig for catamarans because of flutttering sails causing wear along the leach then i also read of a solution to this problem by sewing on the leach 3 ply rope along the edge relieves this problem. I contacted and visited sunbird marine to decide which type of junk rig will be the best for our tiki46 and finally i ordered the sail plan of an advanced junk rig with wishbones and double sails. Rig design database our database of boats which have been rigged or converted to junk rig, compiled by georg warnecke and updated by alan boswell, can be found here. Words and drawings clearly explain in detail concepts that have been successfully used for millenia in the orient. I first had a dream of building a junk rigged sailboat almost twenty years ago. The junk rig association i build a tool for designing. Add to this type of hull a simple box ballast keel filled with scrap iron and cement and you have a very seaworthy, inexpensive and quickly built design. A junk rigged sailing canoe design and construction. Sailpack, the most efficient sail design and production solution. Choosing a chinese junk rig snowbird from bavaria medium. Some of the advantages of the junk rig are, easy to reef, low initial and maintenance costs, lack of standing rigging less to go wrong, and a certain beauty.
Software design and navigation open source, freeware, and shareware. Unlike the confusing numbers based systems, sailmaker consistently presents you with your choice of clear, accurate graphical displays to design your sail shapes by use of the mouse. Sail design with sailpack is basically a three layer process. Use a previous design or select from one of our samples over 100 sample designs are included. Since we arrived in vero beach at christmas, my job has been to design some sails to put on her. And with most junk rig conversions the mast will need to be positioned forward of the bermudan mast position. It seems that one way forward for the modern cruising boat sail rig is not to add more complexity and cost to the sixty year old bermudan rig, but to add insight and modern materials to the over millenia evolved traditional rigs. I ended up designing a stack of master sails, where the batten panels are within 3% in sail area, and with the needed helping lines in place. Sail design software free download sail design top 4 download offers free software downloads for windows, mac, ios and android computers and mobile devices. The most common rig fitted is the colvin designed junk rig. So, before you start to design the sail you need to check your boat for a suitable position mast, then design the sail plan to suit. An excellent combination is also the use of a fairly traditional hull form with the junk rig.
The key is to consider the catenary curve as the span increases, the tension to hold a given deflection increases exponentially. The chinese sailing rig design and build your own junk rig derek van loan on. This rig also has the benefit that fewer controls are necessary to control it, thus putting less reliance on crew skill to create the fastest shaped sail and more on the sailmaker, in other words, its an. As with any rig, there must be correct balance, and sufficient sail area, with an efficient plan form given to the sails. A sail plan is a set of drawings, usually prepared by a naval architect which shows the various combinations of sail proposed for a sailing ship. I have been interested in the junk sail for many years, and after my son experimented with this type of sail we made a four foot long model of a schooner to test sail it. Junk rig sail design the woodenboat forum is sponsored by woodenboat publications, publisher of woodenboat magazine.
In high winds, the flatness of the junk sails is a benefit, where the modern rigged boat will require reefs. Ezzy basic sail design theory kevin pritchard on the panther elite on any given sunny or wickedly stormy day, when we step our feet onto our sailboards and with our booms in our grasp, sheet in, and the wind fills our sails, we start to move. Long before columbus time, early as the 10 th century, the chinese were making their way through the oceans with a rig that has amazingly stood the test of the time. In exchange for the added complexity of rigging, gaff topsls ordinarily provide little gain in terms of usable sail area. The multihull designer nigel irens with his new romily lug sail design has done it.
The design of soft wing sails for cruising boat design net. This rig is noted for its easy handling, low cost, and low maintenance. The junk rig is well suited to downwind travel with its working sails. If you know of any boat missing from this list, please let alan, or the webmatser, or both know so that we can keep this list up to date. Specify the sails overall dimensions, luff, foot, leech etc. There are many who feel that this very old but very innovative sail plan is superior. Junk rigs bruce roberts boat building boat plans boat designs custom boat. Tystie has had a singlemasted junk rig for half of her sailing, 40000 miles. The slot effect helps the air stick to the back of the mains and so increases the stall angle, and thus how high you can point. After sailing on a bermuda rigged boat, and watching a big gaff rig go up, we got on a junk rigged boat and saw for ourselves how incredibly easy these sails are to raise, lower and especially reef. Nov 04, 2018 after a long search, we bought the plans of the tiki46 n2 after a visit to the builders of the tiki46 n1 in uk. Regards amities robert laine free sails design open software. The diagram below of the junk rig describes the basic configuration of the western version of the chinese sail.
For more details of the junk rig, visit the junk rig association at. Designing and building a junk rig adventures with meps n. On doublemasted junk rigged boats, the sails can be flown wingandwing i. Sailcom, a tool dedicated to salesmen for sail and rig measurements and project presentation. I am a mildly capable autocad lt user, but i have been lofting my sails.
This resulted in a rig like that used on the merlin rocket dinghy since the early 1950s and can be seen on, for example, the strider design. Sail design software sailpack is an innovative sail design software that is both more productive and more accurate than any other software on the market. I started this website to help promote, educate and bring together people interested the junk rig. The second important consideration was the rig s simplicity. Part 3 will discuss some particulars about sail panel design and construction. The chinese sailing rig design and build your own junk rig. Issues with the design of the rig are identified and discussed, and the results are compared against data from literature for alternative rig designs. Sailcut cad is a sail design and plotting software which allows you to design and visualise your own sail and compute the accurate development of all panels in flat sheets. The junk rig battens are lightly loaded because they are supported on both ends and only have a small amount of sail to control. The jra junk rig association, formed in 1980, aims to further the development of the junk rig and to create an international community of people interested in such rigs to share experience and ideas. But junk rigs are definitely rife with attributes and many modern hull designs are candidates for retrofitting.
When cruising, many sailors seek the trade winds and maximize their downwind routes. Because of the nature of the rig a junk sail works best on an unstayed mast. Here is a video of a junk rigged compac 19 with a cambered panel sail. Use it to study the aerodynamics of sail crosssections and planforms. We then joined the junk rig association and went on some of the rallies, which gave us the opportunity to sail on a number of junk rigged yachts. The rig is easy to balance and especially powerful in reaching conditions.
Given proper design, there is no reason the junk rig cannot be adapted to performance oriented cruising boats. For the last four years ive been planning to build a junk rig for flutterbyeven before we had looked at her as a possible boat to buy. Virtually unlimited numbers of shaping chords and precise digital information is always shown, giving you complete design control. Alternatively, as a term of art, it refers to the way such vessels are rigged as discussed below.
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