Junk rig sail design software

The chinese sailing rig design and build your own junk rig derek van loan on. 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. We believe it is the easiest to use and most productive sail design software available and integrates flawlessly with our automation process. 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. Tystie has had a singlemasted junk rig for half of her sailing, 40000 miles. 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. Designing and building a junk rig adventures with meps n. 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. 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 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. The junk rig is a wonderful cruising rig because it is simple. 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. 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. Voyager explains junk rig choice ocean navigator january. For more details of the junk rig, visit the junk rig association at. 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.

The chinese sailing rig design and build your own junk rig. Words and drawings clearly explain in detail concepts that have been successfully used for millenia in the orient. 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. Since we arrived in vero beach at christmas, my job has been to design some sails to put on her. Over the thousands of years in which the chinese rig has been evolving, there have been numerous variations on the theme. But junk rigs are definitely rife with attributes and many modern hull designs are candidates for retrofitting. This rig is noted for its easy handling, low cost, and low maintenance. Use it to study the aerodynamics of sail crosssections and planforms. Alan boswell has designed over 250 junk rig conversions for individual owners. And with most junk rig conversions the mast will need to be positioned forward of the bermudan mast position. Issues with the design of the rig are identified and discussed, and the results are compared against data from literature for alternative rig designs. Specify the sails overall dimensions, luff, foot, leech etc.

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. 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. Virtually unlimited numbers of shaping chords and precise digital information is always shown, giving you complete design control. The multihull designer nigel irens with his new romily lug sail design has done it. I was already drawn to the uniqueness of the sail design and wanted a look different from most other sailboats. Alternatively, as a term of art, it refers to the way such vessels are rigged as discussed below. 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. Modern junk rigs are capable of creditable windward performance and can often outreach and outrun boats fitted with more conventional sail boat plans. 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. 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. In a heavy blow, the ease of reefing will give the junk rig a clear advantage.

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. The rig is easy to balance and especially powerful in reaching conditions. I am a mildly capable autocad lt user, but i have been lofting my sails. I played around with free airfoil evaluation software exploring this. The junk rig appeals to shorthanded sailing crews for many reasons, especially because the rig reefs very easily. In high winds, the flatness of the junk sails is a benefit, where the modern rigged boat will require reefs. However, the basic parameters of the rig are well established and any design work that remains will probably consist of minor adjustments. Theres probably no rig more fascinating than the junk rig. The junk rig association i build a tool for designing.

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. I started this website to help promote, educate and bring together people interested the junk rig. As a young yacht designer, in the 1960s, i did the first versions of what became a whole range of our sailing dory designs. Toms designs typically are stayed but a lot of them are hybrid rigs, a conventional jib and 2 junk sails. 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. When cruising, many sailors seek the trade winds and maximize their downwind routes. 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. Sailpack, the most efficient sail design and production solution. The junk is predicated upon sails that are fully battened, a characteristic. Use a previous design or select from one of our samples over 100 sample designs are included.

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. The junk rig battens are lightly loaded because they are supported on both ends and only have a small amount of sail to control. Part 3 will discuss some particulars about sail panel design and construction. The original sailcut was a basic program developed by robert laine in 1978. For western sailors used to sails with a lot of draft it is hard to know when a junk sail is properly trimmed. The key is to consider the catenary curve as the span increases, the tension to hold a given deflection increases exponentially. 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. Sail design with sailpack is basically a three layer process. The second important consideration was the rig s simplicity. 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. Foremost was the certainty that i would be voyaging and not racing. 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.

I first had a dream of building a junk rigged sailboat almost twenty years ago. The diagram below of the junk rig describes the basic configuration of the western version of the chinese sail. 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. As with any rig, there must be correct balance, and sufficient sail area, with an efficient plan form given to the sails. These direct airflow over the main part of the panels abaft the mast. Software design and navigation open source, freeware, and shareware. The most common rig fitted is the colvin designed junk rig. 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. An analysis of the sailing efficiency of the junk yacht.

Junk rigs boat building plans kits sailboats steel aluminum. On doublemasted junk rigged boats, the sails can be flown wingandwing i. My shortgaff sail plans are meant to address the shortcomings of the traditional types of gaff rig sail plan when used on smaller craft say under around 60 feet. 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. The chinese sail previously unpublished 1960 article on the junk rig by. 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. 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. 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.

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. Regards amities robert laine free sails design open software. Junk rigs bruce roberts boat building boat plans boat designs custom boat. In exchange for the added complexity of rigging, gaff topsls ordinarily provide little gain in terms of usable sail area. 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. Sailpackaravanti, an advanced fsi simulation software. Sail design software free download sail design top 4 download. Choosing a chinese junk rig snowbird from bavaria medium. This part discusses the split junk rig and why im excited about it. Sailcom, a tool dedicated to salesmen for sail and rig measurements and project presentation. When running, the junk sail rig shows its advantage. 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.

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. The junk rig is well suited to downwind travel with its working sails. Junk rig sail design the woodenboat forum is sponsored by woodenboat publications, publisher of woodenboat magazine. 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. A junk rigged sailing canoe design and construction. The design of soft wing sails for cruising boat design net. Here is a video of a junk rigged compac 19 with a cambered panel sail.

Sailcut cad list sailcutusers archives sourceforge. 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. Given proper design, there is no reason the junk rig cannot be adapted to performance oriented cruising boats. There you will find a wealth of information and becoming a member is well worth it. Design and build your own junk rig is a stemtostern guide for the western sailor who wants to junk rig any hull. My decision to buy a chinese junk rigged schooner was shaped by several factors. Because of the nature of the rig a junk sail works best on an unstayed mast.