Aft mast rig Building the aft mast rig. Unfortunately Wild Oats XI had to retire, but was being led by Comanche at the time. Development of a sailing rig which discards the inefficient mainsail, and replaces it with two clean leading-edge headsails, acting in a parallel, harmonious fashion with a mizzen sail creatively added and the mast stepped aft in the cockpit area and canted forward 10 degrees. The numbers I entered show an increase of less than 10% in compressive mast loads in the mainluff stay rig. So here I present some variations of the mast-aft rig configured with a wishbone/bipod mast column. 9 KB Views: 285. I’ve not found that really enthusiastic person willing to spend the money (not that much really) on the in-depth force mapping study I had hoped to conduct to search for the most optimum configuration. Fore-and-aft rigs include: Rigs with one mast: the proa, the catboat, the sloop, the cutter; Rigs with two masts: the ketch, the yawl; Rigs with two or more masts: the schooner; Barques and barquentines are partially square rigged and partially fore-and-aft rigged. I tried to push the customer to conventional rig, but he is too impressed by writings of 'aft mast dreamers'. Aug 2, 2016 · The majority of modern boats have their mast raked between 0. Really I need a 20' center hull with 5 feet of boat behind my aft mast mounting step. It is the typical configuration for most modern sailboats. These diamonds are rigged to maintain compression in the leeward spreader. It will be good to test it, but I do not expect excellent windward performance. A mast-aft rig is a sailboat sail-plan that uses a single mast set in the aft half of the hull. May 28, 2002 · There are numerous aft-mast rigs each with a different mast step. I've been posting on rc sailboat forums, but not found much interest or expert advice. A ketch is a two-masted sailboat whose mainmast is taller than the mizzen mast (or aft-mast), [1] and whose mizzen mast is stepped forward of the rudder post. For this comparison, the step is located so the mast bisects the main triangle. In every case I can find what evolved was a larger main, smaller jib fractional rig. Something that takes into all factors, like reefing, good points, cost, simplicity or otherwise, bad points, like how much does the C of E change when reefing etc etc, It is a long thread, 15 pages, to find a summary make take a long time. In other words I lost zero aft support by putting the mast way in the back. Nov 6, 2024 · A ketch rig features two masts: a main mast and a mizzen mast (a smaller mast located aft or towards the back of the boat). Back to the subject of our thread. The purpose is to cause a bit of fore and aft mast bend, so the mast acts a little more like a spring than a compression post. May 28, 2002 · As to what is commonly called the 'Prout' rig (cutter rig with mast stepped well aft by the companionway bulkhead), there have already been discussions of the relative merits of the rig in another thread on this site - I suspect it was in relation to some of the new Broadblue cats where there was a choice of rigs. May 28, 2002 · When rigged for a Bermuda rig, my aft-leading side stays were 17 feet behind a 79 foot mast. 75 and 1. jpg File size: 579. My mainsail dropped weight. Many people really ‘connect’ with my mastaft rig suggestions. A mast-aft rig is a sailboat sail-plan that uses a single mast set in the aft half of the hull. There has not yet been a vessel built utilizing my specific mast-aft design. And doesn't look half bad either. 5 degrees being the conventional upper limit. I don't claim to be a designer, but even for a headsail only rig I'd have thought it would make more sense to have the mast base further forward, in the normal position, and have the mast raked aft to move the mast head to the same position as the drawings. The following are some of the most notable characteristics of the yawl rig: Offers good upwind performance; Can be easily reefed for heavy weather May 28, 2002 · So the drag of the mast in a conventional rig is much less than the same mast standing by itself in a mast-aft rig. May 28, 2002 · Converted my remote control "Nirvana" sailboat into an aft mast rig and gave it a test run today. May 25, 2012 · I am looking for day cruisers or family cruisers sailboats with mast aft rig. The yawl rig is known for its excellent balance and ability to handle heavy weather. Unlike a traditional cutter, the mainsail is a wingsail, and thus doesn't have the "shadow" of the mast to contend with. Jan 21, 2017 · Typically, for proper tension, the shrouds should be tightened using these guidelines; uppers are the tightest, and then fwd. A little about I do. May 28, 2002 · The point I am slowly coming to is all about the cut of the sail used in an aft mast rig. Mast is close to vertical, frame stucture for transverse stiffness. Comparing these two boats side by side you can see quite a difference in how designers think the mast should cant. [19] When set fore-and-aft, the spars extend forward of the mast by about a third of their lengths. Lastly there're the structural considerations. It is set up pretty much the way you describe, except in much smaller scale. May 28, 2002 · So the rig should be fine on such boats for the same reasons (IE lagoons etc). At the bleeding edge, some of the fastest boats do have the foils well ahead of the CG and use a lot of aero tricks and automation to control pitch instability. A cutter is a single masted vessel, differentiated from a sloop either by the number of staysails, with a sloop having one and a cutter more than one, or by the position of the mast, with a cutter's mast being located between 50% and 70% of the way from Nov 1, 2022 · 1. Aft Mast Ketch Rig: tallboy: Multihull Sailboats: 37: 24-10-2016 09:04: Practical aspect of sizing solar panels? Delancey: Marine Electronics: 20: 17-03-2014 00:36: For Sale: New, never used, aft-mast, self-tacking, big-rig foresail: pbmaise: Classifieds Archive: 2: 14-03-2014 17:10: For Sale: Fiberglass Mast Collar with Pulley for Leading May 28, 2002 · I have noticed on many of these aft mast rigs that there is not a lot of horizontal separation between the mast base and the rear stay. This is a rig whereby the mainsails are arranged in a horizontal Dec 6, 2014 · Finally, the short boom (another result of the aft position of the mast) calls for a taller rig to replace the lost sail area. I was just trying to illustrate that it is not the perfect rig design, like everything, it is a compromise. Nov 1, 2007 · The mast aft rig does seem like it will be easy to handle, just expect performance on a reach will be a bit worse than the standard Bemuda rig, but it might be worth is fro ease of handling. May 28, 2002 · I’ve promoted this aft-mast rig for a significant number of years, without a great deal of success in getting it into a full-scale application. May 28, 2002 · Aft mast remote control sailing boat Converted my remote control "Nirvana" sailboat into an aft mast rig and gave it a test run today. May 28, 2002 · I'm 65 (now 73), and I could sail this 65 foot cat by myself with this aft mast rig. Oct 3, 2023 · Aft-mast Origination & Justification Over the past number of years I have attempted to make a positive case for my aft-mast {mast-aft} sailing rig configuration, both within, and aside of the technical discussions of sail aerodynamics. A mast aft rig, especially one that is inclined forward, makes it very difficult to maintain adequate tension in the forestay, leading to lots of sag. This, therefore, beckons the question: is this an efficient and practical rig? May 28, 2002 · This is exactly what we found when using this aft mast rig - impossible to provide forestay tension. May 28, 2002 · the aft-mast rig concept initially sprouted. [1] The main mast is the second and taller of the two masts. The most common way to completely screw up a rig tune is to confuse rake and bend, so let’s start by getting that sorted: Rake is the amount the top of the mast is further aft than vertical. May 28, 2002 · Either way, you are looking at rig failure. Share this: Twitter May 28, 2002 · Aft Mast Alternative on Big Trimaran Aft Mast Alternative on Big Trimaran Several years ago I was asked by a gentleman to come have a look at a big Kurt Hughes trimaran he was building, a 63 footer he had stretched to 65, if I remember correctly. The mast supports fore-sails that may consist of a single jib, multiple staysails, or a crab claw sail. Recent Posts. Mast-aft rigs are uncommon, but are found on a few custom, and production sailboats. May 28, 2002 · There is an interesting sailboat concept called the Universal Hull that uses an aft-mast rig and a single staysail. So I did. Wire luff rigs cannot do this. We're not talking racing rigs but cruising rigs where performance parameters vary enormously. On top the mast offers Jun 10, 2019 · A yawl is a two masted sailboat where the aft mast is shorter than the forward mast. May 28, 2002 · But I do agree that for many charter style cats a rig that goes well to windward is a waste as the hull wont do it anyway. Jan 11, 2016 · Interesting to note that Comanche, which just won line honours in the 2015 Rolex Sydney Hobart Yacht Race, is an aft mast rig. What these studies often fail to point out is the effectiveness of the jib comes from its interaction with the main. To take into account any amount that the mast head sheave extends aft from the face of the mast. May 28, 2002 · Aft mast setups come from Kenya, the philamons have been using it for YEARS there and they have trade winds they sail downwind in only. Mother nature, g forces, and a possible faulty ANSI 54-3 conspired to cut the dyneema back stay on my aft mast rig. Lateen rig is commonly used in the Indian Ocean and the Mediterranean. I remember this one that was brought up a number of years back (2006), on this subject thread. Fore-and-aft tune involves tweaking rake and prebend. Oct 14, 2022 · It appears to have an aft-mast rig something like that of a Prout, but much better stayed/rigged. Explore the unique AFT-mast rig sailboat design with blue and white colors and orange details. lowers, then the aft lowers and intermediates should be hand tight plus just a turn or two. Maybe I've got too much boyancy but I get the feeling if the windspeed picks up enough one could well see a planing displacement hull (or three). is fitted with fore and aft lowers the mast will also be kept from moving fore and aft. Despite the similarity of its appearance to western square rigs, the tanja is a fore-and-aft rig similar to a lugsail. Sep 8, 2015 · What’s in a Rig Series #5 – the Yawl. Do you suppose they might have had storm sails to set? Smaller and heavier constructed? May 28, 2002 · Sure, some rules have banned some things at some times - but mast-aft rigs, rotating masts etc have always been legal in many classes. May 28, 2002 · The points I was trying to make for my aft-mast rig with its big genoa is that I was trying to meet a big variety of conditions with a limited sail inventory (my 3 sails are the only ones I have onboard, and are set up to be reduced in size by roller furling, not hoisted or replaced by alternatives). Or a new larger mainsail could be constructed for the mast that could be extended upward (taller), but still stepped in same location. The dumb f idiot at the Vaal never saw me sail in and out of his marina the three days we were there. Likewise, the mast of the mainluff bisects the foretriangle. There are hundreds of thousands of boats that have been built to rules that allowed mast-aft rigs, full battens, rotating masts, solid forestays etc - how much more opportunity to you need? May 28, 2002 · I'm 65 (now 72), and I could sail this 65 foot cat by myself with this aft mast rig. Jan 24, 2019 · Barry Winiker/ Photodisc/Getty Images. If you wish to get somewhere fast, Motor!. The most common type of small-to-midsize sailboat is the sloop. May 28, 2002 · Others simply are not convinced by the supposed efficacy of the aft-mast rig (a viewpoint that can be backed by the years of experiments with such sails) or are fascinated by other developments that create faster or more refined rigs. A brigantine is a two-masted sailing vessel with a fully square-rigged foremast and at least two sails on the main mast: a square topsail and a gaff sail mainsail (behind the mast). I hear the rig can be easily controlled from one place and as such it should be ideal for people with disabilities? I would appreciate any comments on this rig system from this perspective and if you can point me to any pictures, videos and plans of sailboats with Jan 1, 2009 · We have done the design of 40-footer with aft mast recently, should be launched soon. Note that the horizontal lines in each of the illustrations represent the centerline of the vessel when viewed from above, so you see the overlap of each of the two sails at each elevation in the rig. For decades, You fool people with advantages of aft-mast rig that has never been tested by You. Can someone help me ID it? I went down to that marina today to see own I might contact the owner, but the office was closed for Fri. He was VERY concerned about handling that big mainsail on that big sloop rig. Components of Rigging. Actually I do not belive in aft mast rig so much advertised by Brian - it has never been built and never proved working. What proved workable in my little experiment was a sail that came to a point down on deck level. For the most part I am content with this being a singular mast column, stepped a little further aft on the vessel, and canted forward approx 10 degrees. Bermuda rig, Bermudian rig, or Marconi rig is a type of sailing rig that uses a triangular sail set abaft (behind) the mast. Mar 5, 2020 · This procedure gets more complicated according to the number of spreaders and the type of rig. Installed through a 1 3/4" x 5/8" slot in the mast, Spreaders fit over the Bar and are pinned straight through the Bar, holding the Bar and Sep 13, 2016 · If I had bothered to rig Lazy Jacks, the whole operation would have been so much easier, but still there would have been the bit with the Tack, the Clew, and bundling. I ended up with a cut dyneema line, and shorter mast to work with. Designers were free to have aft mast all jib sail plans or mast in the bow cat rigs. My sail area is balanced over the pivoting centerboard. Why don't You put big red disclaimer on Your web saying 'this type of rig is not tested'? You are referenced on many multihull websites as as yacht designer - the designer who has never built any boat! May 28, 2002 · That fractional rigged cat with a 90 foot wingmast carries about the same sail area of my mast aft rig with a 73 foot mast. This yard also had to be shifted from one side of the mast to the other, everytime tacks were changed. com France: Seldén Mast SAS • Tel: 33 (0) 251 362 110 • info@seldenmast. May 28, 2002 · The single biggest concern voiced about this mast-aft rig configuration is the large amount of backstay(s) tension it will experience as a result of the geometry and the need to maintain tight forestays, and then the extra compression loading this will impart to the mast. May 28, 2002 · Interestingly, this phenomenon was probably most detrimental to the Prout mast-aft rig. More fore-and-aft bend reduces power since it flattens the sail. The mainsail is a tall, triangular sail mounted to the mast at its leading edge, with the foot of the sail along the boom, which extends aft from the mast. . If using double lowers, make sure the mast remains straight athwartships. May 28, 2002 · Updated Photos of Aft-Mast Rig and Crab Claw Sails Well for your viewing pleasure here is my aft-mast rig and her crab claw sails in production. Acceleration and handling are noticeably better. These rigs evolved in two person boats. fr Some rigs are equipped with diamond shrouds (from the forestay attachment via the spreader tip to the mast heel). What materials are available to make an aft mast that hangs out over the deck and does not flex from the weight of the wind in the sails? Boeing just built a new airliner with carbon spars in the wings. May 28, 2002 · Most, if not all mast head rigs, have what is called a 'mast crane'. In very light air and chop, or in light air and flat water, it is used to add prebend, sometimes as much as 1/4″ to 1/2″. Comparison to Other Single Mast Rigs. Even if both rigs were the same height the sloop will kill the ketch on any upwind course. As Eiland has stated quite often, this rig may not achieve the best speed in light conditions, but who cares. This definition is easy enough to comprehend but a little tricky to put into practice on a yacht in the distance since you can’t see the rudder or rudder post! Sep 4, 2023 · The yawl rig is similar to the ketch rig, but the mizzen mast is located further aft of the cockpit. Nov 21, 2011 · Any study of rig effectivness points out that on a per-area basis, jibs are more effective than mainsails. I think boats like this will accelerate the movement to aft-mast rigs. The mizzen mast stepped forward of the rudder post is what distinguishes the ketch from a yawl, which has its mizzen mast stepped aft of its rudder post. A rig which combines both on a foremast is known as a hermaphroditic rig. Perfect for sailing enthusiasts and those who appreciate cool boats. All sails roller furled for easy single handling. In extreme cases, this prevents mast failure from too much bend. However, the sloop rig is not advisable for boats more than 40ft as the sails will be difficult to manage. pardon the length. By simply dropping the sail (made possible with the Mast-aft Cutter rig), I reason, I eliminate two of these three steps, leaving just the bundling. And my forestay is just slightly longer than his fractional jib forestay. Now if you kept the light weight, daggers etc and used a aft mast rig. View All. I doubt this study, which is constantly being quoted, proves that the mast aft rig is generally superior. That the boat is trimmed correctly fore and aft and not down by the bow or stern (thank you, Eric Klem). The sail was suspended from the upper spar ("yard"), while the lower spar functioned like a boom. Square Rigged. Say for example, that the boat was designed from the very beginning to accept this rig, then perhaps a stern that slopes rearwards would be more suitable, perhaps something along the double ended designs of May 28, 2002 · Would this tri qualify as an aft mast rig Attached Files: 20151207_154324. The ketch rig is often found on cruising boats and offers increased sail area with better balance and more control. 1 to 2 degrees. The mainsail is either small or completely absent. Now, I was always enamored with bi-pod mast rig aboard Olaf Harken’s ‘Procyon’ vessel. Surely putting more bouncy forward ,by lengthening the bows, in a vessel type prone to nose diving, has little to do with the original concept discussed in this thread all those pages ago. So to my knowlegde out of 3 catamarans built with aft mast, at least 2 were sold on secondary market as power catamarans, without mast May 28, 2002 · Don’t get me wrong Mike, I can fully appreciate your concerns for where the drag center is on my bare poled mast-aft rig, particularly in storm conditions. It was 66 kg and is now 33 kg. I've suggested a purely round (bulky) furling foil, which incidently furls the easist. This type of rigging is quite popular due to its great ability to sail upwind and it’s also appropriate for short-handing. The gaff pole helps extend the area of the mainsail. May 28, 2002 · The most evolved sail plan came from classes where sail area was limited but rig design was not. May 28, 2002 · An extreme rig with small main and large masthead genoa has the same loading as an aft mast rig. com Development of a sailing rig which discards the inefficient mainsail, and replaces it with two clean leading-edge headsails, acting in a parallel, harmonious fashion with a mizzen sail creatively added and the mast stepped aft in the cockpit area and canted forward 10 degrees. Again what I so anxiously wanted was even more sail area up front. Their short vertical mast at the aft position resulted in a highly sloped forestay that was both too long for the rig’s overall height, and it could over-exert a forward pulling force on the masthead that was indefensible by the shallow-angled backstays May 28, 2002 · Mast aft wing sail I've just come across this thread and I'm pleased to find a wealth of knowledge on mast aft sails. The ease of handling by single handed sailor, less rigging, etc etc. This actually could become a critical point to consider in designing/deploying this rig, and having the everyday sailor enjoy it. That’s why many tuning guides recommend tightening the rig in heavier air. Key Characteristics: Two masts: The main mast and a smaller mizzen mast. and hinged to fold down for clearing bridges. [1] Puts significant strain on the top of the aft most mast; Schooner Rigging: A schooner has two or more masts, with the forward mast shorter or equal to the aft mast(s). Many mast-aft rigs utilize a small mainsail and multiple staysails that can resemble some cutter rigs. 20151207_154234. A wishbone rig, sometimes also known as fishbone ketch, is a type of rigging on sailboats. The forestay and backstay position the top of the mast, in a fore and aft direction. Amazingly, all of it works on the Lagoon 52: the tall rig is efficient; the mainsail is easy to trim, raise and furl (although the standard electric halyard winch is still essential); the roller-furled headsails behave May 28, 2002 · Now. May 28, 2002 · Also the down force of the bermuda sail rig pushes his leeward hull under the water while the aft mast sail provides so much lift I hardly notice it. Mast Step has provisions for (12) 14mm Mast Step Block Pins, NG3-21, (2) 12mm NG2-21 Block Studs (aft), and a Vang Bail, FM3-20A, for attachment of a soft Boom Vang. This site has a reprint of an article the July issue of the British magazine, "Seahorse" (alas, without the referenced diagrams), but the YouTube video shows good performance from a small rig. 2 KB Views: 281. A typical mast rake ranges from one to one-and-a-half degrees on a cruising masthead rig to as much as four degrees on a fractional racing rig. The boom, leech, and mainsheet act exactly like the backstay and jumper strut of aft mast rigs. If they don't, they porpoise. May 21, 2008 · My mast aft rig on the 65 foot cat is approx 15 feet shorter than the comparible fractional sloop rig of the same sail area on this other 65' foot cat. ~With an in-mast furler it is recommended to tension the aft lower a bit more to promote a straighter spar (fore and aft) for May 28, 2002 · Aft Mast on Trimaran, failure Please note that I am willing to face up any failures of my aft-mast rig concept, and attempt to determine what the problems might be. It is possible to rake the mast forward or aft to the desired amount by the correct adjustment of the forestay and backstay. May 28, 2002 · Common lateen rigs have a small spar on the leading edge of the sail. May 28, 2002 · Concur. May 28, 2002 · Again, the reason for adopting an Aft mast rig is not to win races but more to the liking of long haul cruising. Block Pins and Vang Bail are installed from underside of Mast Step Casting, Mast Step must be removed to install Block Pins or Vang Bail. This blog is about how I turned a desire into reality. There have been in the past a number of experiments with various mast-aft concepts, most of which were unsuccessful due to their placing the mast at the extreme aft end of the vessel, and thus were unable to provide adequate forestay tensions for the larger headsails. Or add a stern spar about 8' long at a 45 degree angle up and over the stern. Give May 28, 2002 · Here are a few illustrations (rough draft) that I made of 3 style rigs, fractional jib, masthead jib, and then aft-mast rig. [1] See full list on improvesailing. May 28, 2002 · I know how I plan to manage the lateen topsail on my aft mast rig. May 28, 2002 · Several experimenters have noted this problem including Bolgers aft mast rig. May 28, 2002 · aft mast - dream or reality? I see Spiv's version of aft mast rather practical. May 28, 2002 · I was wondering if you had a summary of your trial with aft mast rig written up anywhere. Jun 12, 2021 · A sloop rig has a single-mast and a fore-and-aft sail configuration. May 28, 2002 · Maybe they're suggesting that in cruising mode where Lagoons (and other overweight catamarans) have mains'ls the size of hankies and jibs of little consequence, that the aft mast rig provides better possibilities. Let's see, I am sure aft mast rig is only good for downwind sailing. • Tel: +1 843-760-6278 • info@seldenus. And you have brought this issue several times before, so I thought I would reply in greater length…. May 28, 2002 · The biggest problem with a mast aft rig is getting enough support aft, as the mast is so far back. Their short vertical mast at the aft position resulted in a highly sloped forestay that was both too long for the rig’s overall height, and it could over-exert a forward pulling force on the masthead that was indefensible by the shallow-angled backstays Apr 7, 2006 · The mast-aft rig designs I’ve found online are monohulls or cats with the mast placed just in front of the cockpit, at about 2/3 of the LWL, canted forward 10 deg. I also caught your picture of the cat designed by Radius. Amazingly, all of it works on the Lagoon 52: the tall rig is efficient; the mainsail is easy to trim, raise and furl (although the standard electric halyard winch is still essential); the roller-furled headsails behave May 28, 2002 · Thus this rig could be converted to a straight standing cutter rig with the mizzen becoming a more traditional mainsail attached to the aft edge of the mast. ) The lateen rig required a yard that was at least twice the length of that required by a square rig, for the same sail area. The second mast is also set aft of the rudder post. That the forward and aft shrouds, and/or internal head stay and runners are loose enough to remain floppy and do not come tight as we adjust. A cutter is a single masted vessel, differentiated from a sloop either by the number of staysails, with a sloop having one and a cutter more than one, or by the position of the mast, with a cutter's mast being located between 50% and 70% of the way Mar 18, 2022 · Mast rake is a measure of how far the mast is angled aft from a straight vertical. 5 degrees, with 2 to 2. Having the mast vertical, or even raked aft a bit, will do loads to improve the head stay/back stay compression ratio. The rig is one mast and two sails. May 28, 2002 · aft mast gaff cutter Hi, I'm a newbie here, but have been following various threads for a couple of years, particularly this one on aft mast rigs. 3m) gaff rigged cutter, a kit boat built in 2002 and have just recently converted it to be aft masted. Understanding these components is the first step to mastering your rig: Mast: The tall vertical pole that supports the sails. Feb 19, 2021 · That's why an airplane has the lift aft of the CG and uses the empennage to push down and cancel the main wing's nose down moment. I had Tasker make my foresail very much like a jib with a tall luft back end. I'm currently back in Thailand and making some minor modifications to the rigging after the first sea trials. Bend is the amount the centre of the mast is deflected forward from a straight line drawn from masthead to mast butt. USA: Seldén Mast Inc. That leads to the conclusion that rigs would better if they were all jib - hence the mast aft rig. Some references suggest that fractional rigs should have about twice the rake of a masthead rig, say, 2 to 3 degrees vs. Featured Pages. Aft-mast rig -- a sighting (~25 years ago) (Just happened upon this topic -- I know it's old -- and just registered. This would mean the forestay tension would be much higher, backstay tension much less. Now for a cat with its already terrible windage, the addition of daggers, light weight design and an efficient rig, it can now sail to windward quite well. Comparison to other single mast rigs. Take a few turns on the lowers to achieve the right amount of pre-bend. I think a mast head rig would be inherently more rigid. It should be more than with an in-line masthead rig, but a mast should never bend to more than 2% of the height of the foretriangle even with the backstay tensioned (that’s May 28, 2002 · I need to tighten my bow stay more. Aug 17, 2003 · Variations on the Mast Aft Rig Concept By now many of you readers are aware of my affinity for the mast aft or aft mast sailing rig concept. Other considerations. Spreader Bar for #9 Mast w/ 7/32" Aft Lowers: RR 9M-275B-7WA: Aluminum Spreader Bar Assembly for RR #9 Mast is used with Rig-Rite SP275T Spreaders for rigs with aft lower shrouds using 7/32" Wire Stemballs. There are various reasons for this, the main being ease of use. For example, if I had say a 20 ft of fore and aft staying base, I would put my mast no further aft than 13 ft, 8 inches. With the new aft-rig the two new chainplates are 16 feet behind a 62 foot mast. There is a wide based version, and a narrow based one. May 28, 2002 · Materials had to be invented to make Montgomery & Bolger's vision come to fruition in the aft mast designs of the last few decades. Next, a fore and aft spreader, that extends from the mast all the way to just above the chain plate, may well cut such a load in half, at least. And the rig on that 65' trimaran is approx 15 feet shorter as wellsame sail areas. May 28, 2002 · The aft mast rig has three sails, the other rig is a fractional sloop. Still a few bugs to iron out in the rigging, but first impressions were more than encouraging. And with the balance and low power afforded by the smaller 'mainstaysail' I could sail this vessel right off the mooring or maybe right off a side-to-dock slip. I can add a single aft spreader at 19' up and anchor at the mast step. This end of the IOR era sail plan is still better than the aft mast rig because the main acts like a fairing to reduce the drag from the mast. Mar 15, 2021 · Pre-bend is the fore-and-aft bend in the mast of a fractional rig before the backstay is tensioned. I wonder if you have seen it. I've been experimenting with mast aft wing sails on rc model monohulls and multihulls for the last few months. This type of craft is the best selling too! Lagoon noticed, and I like thier aft mast rig. Regardless of the type, all sailboat rigging systems consist of several key components. The point is that (as others have said) mast positions and rig designs are influenced by so many factors that we can't just point to any one design as evidence of broad trends or proof of concept. Rig tuning also keeps the mast shape from changing too much as the wind builds. Lateen Rig - This is a triangular fore-and-aft rig whereby a triangular sail is configured on a long yard that's mounted at a given angle of the mast while running in a fore-and-aft direction. May 28, 2002 · Finally, the short boom (another result of the aft position of the mast) calls for a taller rig to replace the lost sail area. Observe how the peak of a lateen rises well above the mast. In the 19th and 20th centuries Fore-and-aft mast bend. I have a 24' (7. And this wishbone shaped mast rig in my photo gallery also intrigued me. May 28, 2002 · The resulting rig is a hybrid of the cutter (which puts the mast pretty far aft to begin with) and Brian's mast aft rig, with it's mizzen staysail. And a long lateen yard dropped on deck, lowers the rig dramatically in stormy weather. PS Our 40' cat could be converted to normal rig any time. May 28, 2002 · 2. Correct mast tuning is vital to getting the best performance out of your boat. Everything I've read about aft-mast rigs and supposed increases in efficiency are based on steady state conditions. Jan 1, 2010 · The history of the fore-and-aft rig is a fascinating one. Mar 11, 2014 · The mast lever or mast fore and aft control (also known as “mast ram”) is a critical adjustment. Feb 2, 2011 · Again use the main halyard -this time pulled tight against the lower, aft edge of the mast -as a measuring reference. A mast should never be raked forward unless there is something unusual in the boat design (you’ll know if this is the Development of a sailing rig which discards the inefficient mainsail, and replaces it with two clean leading-edge headsails, acting in a parallel, harmonious fashion with a mizzen sail creatively added and the mast stepped aft in the cockpit area and canted forward 10 degrees. Here is what my new rig looks like. Common lateen rigs have correct gust response, the tip flexes and depowers the tip of the sail. Thanks Brian for the great pictures of Hong Kong 40. It is particularly interesting when you realize that two of the earliest fore-and-aft rigs, the lateen sail of the Middle East (Egyptian feluccas and Arabian dhows) and the Chinese junk, have remained largely unchanged over the centuries and are still in use in the areas where they began. Top speed seems higher - I have never outrun the wind waves before. I like to have the fore and aft stay base aft the mast to be roughly one half of that that is before the mast. ) Something like ~25 years ago I saw an aft-mast boat docked in Westport, WA -- apparently being lived-aboard. Personally I was not in favour of that rig, but if customer takes 'aft mast' as his fetish - we had to design it. Mar 12, 2008 · Brian Eiland designed a very interesting aft mast ketch rig Sail Propulsion - Revisiting a Mast-Aft Sailing Rig This rig offers a boomless ketch rig with one mast only (saves weight). Feb 20, 2015 · That mast aft rigs were "BOLD experimentationsomething (other sailors are) they're affraid oftoo conservative" "My prior 'mast-aft ketch' had elicited notable resistance among members of the conservative sailing community" and there's more along that theme. jpg File size: 369. My boat, as modified by me, may well have its rig further aft than any other boat in the entire class, so I'm not saying that mast forward works better. Like, the ketch a yawl is equipped with two masts, a main and a mizzen, but ordinarily on a yawl, the mast is smaller and set behind the rudder post. Next crank up on the backstay until you’ve got a curve in the mast equal to 1/2 to 1 times the fore and aft dimensions of the mast. There are many guides to tuning available online. I met a guy who sailed 38-40' lagoons from France to AU to sell with his own money.