mainsail reefing systems

To this end, the upper part of the cover 5 constituting the fixed end of the boom 1 comprises a hump 48 fitted with two flat sides parallel to the plane situated in the axis of the boom 1 and mast 11. In order to avoid the maneuvering cordage sliding on the notched pulley, use is made of two pulleys which bring the cordage back against the notched pulley, as well as two pulleys which direct the two strands of the maneuvering cordage towards another notched pulley which is operated by means of a handle. Single line reefing essentially means that the outboard and inboard reef cringles use one line to tuck (or haul down) both ends of the sail. For further advice and support please feel free to contact us at support@upffront.com. This system is based on the proven reliability of the CDI Flexible Jib Furler. 1. If your lines lead back to the cockpit and you have a single-line reefing system, the process is straightforward. Experience has proved that, even if the recess is maintained vertically above the area for winding the bolt rope onto the winding device, the bolt rope does not necessarily wind in the axis of the recess, thereby causing a pressure stress at the entrance to the recess capable of hindering and wearing, or even jamming the bolt rope between the lips of the recess. Then, in 1975, the first in-mast furling system, the Hood "Stoway," was introduced, followed years later by Selden and other notable brands still active today. When the sail is subjected to the action of the wind, major friction stresses are also exerted between the bolt rope of the sail and the recess, which makes it difficult for the bolt rope to slide in the recess. To activate the Karver KHR reef hook, simply haul down on the mainsail to get the reef point close to the hook. An In-Boom Reefing System which is ideal for fast and efficient reefing when sailing single handed or short crewed. Found inside – Page 116Hood Yacht Systems' Stoway® Mast mainsail reefing and furling system makes big boat handling simpler and safer. Stoway offers complete control of the mainsail from the safety of the cockpit, and gives you the ability to match the size ... Then, cleat it off. With more options and methods of reefing available, it can be important to pick the system that best fits your needs. The bolt rope thus exerts friction stresses at the level of the lips at the lower end of the recess and tends to jam between them if the bolt rope is subjected to a high degree of tension. In-mast furling systems have come a long way. On the other hand, irrespective of the location of the drive means used, it can be observed that the recess maintaining the bolt rope is not situated vertically above the area for winding the bolt rope about the winding tube. This is OK until Mother nature gets angry and you have to deal with what she hands out to you out there. In order for the bolt rope 34 of the mainsail 10 to be maintained parallel to the mast 11 and therefore for the mainsail 10 to be able to be wound without any folds around the winding tube 2, and despite the position of the drum 8 at the head of the boom, the bolt rope 34 is fed into the longitudinal recess 17, 18 of a profiled member 20 which is secured to the mast 11 by means of supporting parts 23, 34 so as to leave a slot 12 between the mast 11 and the profiled member 20. We also show how to set a reef using the single-line system. The first in a series on sail handing systems, Quantum's expert David Flynn dives into the options for keeping - or getting - a handle on your mainsail. HRC REEFING LOCKS : SECURE THE REEFING. The most common choice for modern yachts is slab reefing, in which there are typically three reefs that are progressively pulled down to shorten sail as the wind increases. The mainsail can be furled from the cockpit as easily as furling the jib. For ease of handling it is slightly more complex than In Mast furling but still lots easier than using a conventional mainsail. In very closed angles (close to the wind), the slot can be seen to have virtually no effect. > Secure the mainsail reefing by encircling the boom. Conversely, at conditions closer to running, on curve C2, the lift Cz is considerably enhanced in the presence of a slot and the drag Cx is slightly reduced in relation to curve C1. The friction stresses opposing the mainsail winding or unwinding maneuvers are thus significantly limited. The CDI Mainsail Reefing System is intended to reef and furl mainsails or mizzen sails easily and safely. Before that, on a Trapper 500, I had the old rotating boom system, which was dreadful. Found insideReefing a dinghy It is possible to 'reef' the sails (reduce the sail area) on many learner and recreational dinghies. ... no shrouds and a luff tube mainsail – such as the Topper or Pico – have a simple reefing system that is dependent ... An ingenious addition to their portfolio, Karver’s KHR Reef Hook offers an unconventional way to reef your mainsail. 1, the sail reefing system embodying the invention is mounted inside the boom 1 which is comprised of a tubular member 13 closed off at each of its ends by tubular covers 4, 5 fixed to the tubular member 13, e.g. Mainsail reefing is an important part of mainsail trim. The efficiency gain of the sail obtained by means of the slot 12 is illustrated in FIG. Then it is run up through a jiffy grommet on the leech above the clew and down to a bullet block on the other side of the boom. Colin fully updated this post in February 2015. The boom was turned with a crank to wrap the main around the boom and reduce sail. This is a three-part story by itself, but in sum a reefing system needs to exhibit the following properties: a) Be easy to set and shake out; b) Hold the sail's shape when set, and; c) The reefing lines ought to run clear of anything that will chafe them. elliptical cross-section comprising two flattened lateral flanks 43, 44 ended on one side by a full edge (leading edge 15) and on the other side by a longitudinal slot 16 providing access to two internal longitudinal recesses 17, 18 each serving to receive the bolt rope 34 of the mainsail 10. Even so, the mainsail remains a challenge. Both lines can be operated remotely - from the cockpit or mast step. The reefing system must pull the clew out along the boom, like an outhaul, as well as pulling down. There are lots of benefits that make a reef hook more advantageous than a traditional pennant reefing system: No line stretch - Textiles stretch under load. An efficient and effective mainsail reefing system will make any sailing boat - whether a small weekender, offshore racer or ocean cruiser - easier to handle, faster and safer. The system makes reefing your mainsail a quick and easy operation. For more information or to place an order call 949.642.9530. 3. 1. Found inside – Page 109Hood Yacht Systems' Stoway® Mast mainsail reefing and furling system makes big boat handling simpler and safer. Stoway offers complete control of the mainsail from the safety of the cockpit, and gives you the ability to match the size ... The best online source Harken and Tides Marine/Strong Track Mainsail Luff Systems at the best price. In certain cases, the boom is of tubular structure housing the winding tube, this structure being open in its upper part by way of a longitudinal slot to leave room for the sail to pass. The boom was turned with a crank to wrap the main around the boom and reduce sail. A lot of people know these by one sailmaker's product name Stack Pack, but generally these are open-top mainsail covers that are supported by lazy jacks. These curves were obtained by using a sail and slot area equal to the area of the sail without a slot. This system is designed to accommodate all wind and sea conditions. Found inside – Page 68If that is not possible, it may be time to consider fitting in-mast or in-boom mainsail reefing systems that can handle the mainsail from the cockpit so that the need to work at the mast is much reduced. Such a bolt rope guide enables all wear, hindrance or risk of jamming of the bolt rope to be eliminated. When the sail is not in the axis of the recess, it also rubs against one lip of the recess, which further hinders or even prevents the bolt rope from sliding in the recess. Found inside – Page 253There are a number of reefing systems available; the most popular on modern boats is slab reefing (below). An alternative is roller reefing where the mainsail is rolled around the boom, or its modern version where the sail is rolled up ... According to another feature of the invention, the device comprises two pulleys integral with the profiled member, placed at the top of the mast, the groove of the first pulley being placed at a tangent to the axis of rotation of the profiled member, while the second pulley is placed so as to bring the halyard vertically above the eyelet for fastening the halyard to the mainsail. Also, no need for lazy jacks or mainsail cover or lazy bag. Sometimes referred to as jiffy reefing. In FIGS. Thus, by way of the slot 12, the mast behaves like a flap on the leading edge of an aircraft wing. 4, the fishplate 41 is therefore of bulged shape 68 which corresponds to the inner shape of the leading edge 15. The running rigging moves about the boat, or can be moved. No line stretch - Textiles stretch under load. Reducing sail in a timely manner is important not only to the comfort of the crew but for the safety and efficiency of the vessel as well. With the common slab reefing system, reefing is fairly simple, though it's a skill that requires some practice. Accordingly, in order to achieve these results, there is provided a mainsail reefing system comprising a winding tube mounted rotatably parallel to the boom and a means for rotatably driving the winding tube, mounted coaxially with the tube end situated on the end of the boom secured to the mast, the mainsail being slidably mounted on the mast by means of a bolt rope integral with the sail and sliding in a recess extending over the entire length of the mast. As a result, say goodbye to big, high load reefing lines and high load jammers. As represented in FIG. Found inside – Page 17Make sure you understand your reefing system and maintain it appropriately to minimise this risk. If a jam does happen with the ... Mainsail. furling. systems. The shape of a furling mainsail will never be as good as a slab-reefed sail. Found inside – Page 164The NEW Furlex Jib System Roller Reef The Mainsail Just Like Your Jib s Furlex introduces a whole new way to sail with the add-on Furlex mainsail system. The same ease of handling and safety you gain with headsail roller reefing can now ... The linkage part 33 is then fitted, followed by the upper section of the profiled member 20, onto the protruding part of the fishplate 41 until these elements meet end to end. Technical support at Vela Sailing Store. Then there were rotating booms, around which a sail could be wound to achieve the same effect - roller reefing, in fact. There are lots of benefits that make a reef hook more advantageous than a traditional pennant reefing system: In addition, sailors that have sailed with the Karver Reef Hook have stated that its simplicity and high performance make it an efficient reefing system with provides complete satisfaction out at sea, never letting a reef drop out. In FIG. This is where modern mainsail reefing systems come into their own. Privacy Policy Some systems have a furling drum, rather like those on a furling headsail, on the leading edge of the mast, from which a furling line can be led aft to a manual or electric winch in the cockpit for simplified reefing. Accessories and options have been developped by Facnor to assist you in setting up Facnor tracks and cars, or to simplify mainsail handlings (Mainsail reefing locks or reefing rings,…). Ease the main topping lift. Thus, the friction stresses opposing the maneuvering of the winding device are substantially reduced. The reef points along the belly of the sail are used only to tie up the loose body of the sail; they should not carry any load. We are constantly reporting on the latest innovations in the marine industry which offer weight savings whilst, at the same time, increasing safety factors. 8, the profile 20 recess lips can be seen to have been eliminated up to the position P of the entrance 89 to the recess 17, from which the bolt rope 34 must penetrate the recess, the rollers 84, 85 being fixed tangentially to the recess 17 so as to guide the bolt rope 34 in the axis of the recess 17. In this way, only one pulley 35 is needed to bring the maneuvering cordage 9 towards the rear of the boat where the cockpit is situated. Found inside – Page 32The PROFURL IN-BOOM MAINSAIL REEFING FURLING SYSTEM 5 designed to be fit on most aluminum masts without stepDing the mast. From the comfort of your cockpit, simply pull on your halyard * furling line a to deploy your mainsail. A list of production yachts at the Annapolis Boat Show using Slab reefing include; Impression, Dufour , Southerly, Outbound, Fingulf, Valiant, Delphia, Grand Solie, X41, … You might want to think about a single line jiffy reefing system. This will cause the mainsail to luff, stabilizing the boat by reducing heel and easing the tension on the mainsail making it easier to drop. Found inside – Page 21Indeed, this produces the best of all worlds because such a jib will invariably set better than the deeply rolled genoa. It can therefore be used routinely for heavy weather sailing. In-boom mainsail reefing systems now exist which are ... Advantageously, the profiled member 20 is pivotally fixed to the supporting parts 23, 24 by means of linkage parts 33, while being subjected to the movements of the boom 1 in a plane perpendicular to the mast 11. GP14 REEFING SYSTEMS Oliver L. Shaw Major Revision, 21st January 2019 Minor Further Revisions 28 th September 2019 and 6 th March 2020 This paper describes simple and practical ways to reef the genoa and mainsail on a GP14 dinghy. … The Reefing system. The action of the wind on the sail tends to spread apart the lips of the recess. If this is not done correctly, the outhaul or foot of the sail cannot be adjusted without the use of a hydraulic ram. Found inside – Page 249There are a number of reefing systems available; the most popular on modern boats is slab reefing (below). An alternative is roller reefing where the mainsail is rolled around the boom, or its modern version where the sail is rolled up ... 8; and. While slowly easing the main halyard, take in the reefing control line. Location of the cleats is coordinated w/ location of cleats and eyestraps on my lazy jack system. Two separate reefing lines are used for each reef; one pulls down the leech of the sail and the other pulls down the luff. Mainsail Reefing System . 6A and 6B show the shape of the airstreams around the profiles of the mast 11 and mainsail 10, 10'. Found inside... back on course Tidy up reef points when the boat is sailing and more stable (although some proprietary slab-reefing systems make this unnecessary) Except on the smallest of yachts, slab reefing the mainsail is likely to involve some ... Please contact us. Thus, the boom 1 is pivotally suspended from the supporting part 23, and the cap 45 follows the rotating motion of the boom 1 in the plane perpendicular to the mast 11.

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