P

A loop-shaped fitting used to secure a line to some part of the boat. An urgent radio-announced message regarding the safety of people or property. A mayday call is used when there is an immediate threat to life or property. A pan-pan situation may develop into a mayday situation. Pan-pan and mayday messages have priority on radio channels and should not be interrupted. In the case of a less urgent safety message, the securite signal is used. Parachute Anchor (Sea Anchor) A large...

Decision Parameters

When deciding between purchasing one or the other catamaran it helps to evaluate objectively and score each parameter. Since Safety is the most important characteristic its rank should be multiplied by a factor of two. In this example the X-cat might be a new, well-built production catamaran, which is compared to a Z-cat, a pre-owned less expensive alternative. Y-cat might be a new semi-custom high-tech boat, whose score lies somewhere between the two other vessels. crewmember. Don't consider a...

Leopard

Recondition Battery Guide

The Leopard 40 (the charter version is called the Mooring 40) is the newest addition to the popular line of South African catamarans built by Robertson & Caine. Due to her careful construction and standard accommodation features, this catamaran has become sought after by charter companies and cruisers alike. The rigid hardtop spans the entire width of the cockpit and incorporates a sliding section, which allows the helmsman to view the sails from the steering position. Generously...

Tensile Strength

Various building materials possess different strength characteristics. It is interesting to note how their durability to cycling loads change as they weaken with use. Composites, such as carbon fiber or aramid layups, show the highest strength even after millions of cycles. Aluminum, which starts out as the strongest boat building material, loses two thirds of its strength after seven million test cycles, whereas carbon fiber is hardly affected. next page bottom An advantage that building with...

Sails

All sails (Dacron-Polyester, Spectra, Composites) are sensitive to salt and the ultraviolet rays of the sun. Keep them covered unless sailing. Rinse as often as possible with fresh water. Sails should always be protected by a cover or lazy bag when not in use and ideally should be flaked when dry. Change the chafe guards, in particular at the batten-pockets (annually). Change the UV covers every 2-3 years as necessary. Disassemble the jib furling drum before each winter lay-up. Store in a dry...

Anchoring

Battery Reconditioning Review

A shallow-draft multihull is a joy to anchor. Usually the ground tackle is ready to deploy, either located on the forward crossbeam, or even better, at the central mast bearing beam, closer to the center of the boat. A bridle can be pre-rigged and one simply has to attach it via a snap shackle to the anchor chain after the anchor has set. Bridles will absorb the loads and distribute them via triangulation to both bows. In tight anchorages care must be taken as catamarans might have different...

Introduction

Over the past decades they have established themselves in the charter industry and proven themselves as capable liveaboard cruisers. They can now be found in every harbor - from beach cats to 140-foot monster multihulls. Today the fastest sailboats are catamarans, clocking more than 700 miles per day. From circumnavigating vessel, to luxury yacht or passenger ferry -the multihull concept works The evolution within the boating industry has matured sailors and their...

P I

A typical view of a Caribbean sunset from a stately Privil ge 495 catamaran, made by French builder Alliaura Marine. Copyright 2006, 2008 by Gregor Tarjan. Click here for terms of use. hull shape, underwater appendages, rig type and construction. Let's look at each of them in detail and see how they affect the dynamics and design of a multihull.

T

Recondition Battery Guide

The Yapluka 70 belongs to a select group of extraordinary yachts meticulously built to Bureau Veritas specifications in the North of France. Undoubtedly this aluminum masterpiece represents the highest craftsmanship, design and engineering incorporated into a luxury catamaran. The Yapluka 70's pure lines are beautifully integrated into her trademark bimini, which is a visual continuation of the streamlined saloon-coachhouse. The interior rivals any top class custom furniture builder and is...

B

Catamaran Design Ratios

Finite Element Analyses and computer modeling are used to analyze complex engineering structures. This is a simulation technique whereby a mathematical model of a multihull is subjected to known loads and consequently properly engineered composites can be determined. Complex structures such as catamarans are suitable subjects for this clever method. Finite Element Analysis, which just recently made its way into the mainstream of pleasure boating, basically determines which areas of a multihull...

Noteworthy Multihulls

N the following chapter I have attempted to objectively present and illustrate some of the popular cruising catamarans which are available today. Purposely omitting custom boat builders, the multihulls in this section represent about 90 of today's production cats. My company, Aeroyacht Ltd., an international dealership specializing in multihulls ranging from 35'-200', has seen several new builders come and go over the past few decades the following yards seem to have passed the test of time....

Info

Let's say you are driving north at 55 mph, arm stretched out the window and the True Wind is blowing from the north at 55 mph. You guessed it. You would be struggling to keep your arm straight, as your hand would experience a storm-force wind of 110 mph. But at the next exit ramp you decide to get off and go back south where you came from. Driving south at the same speed your hand would experience no wind at all. Correct Zero wind, although it is still blowing a good 55 mph...

Bimini Solid Cover For Catamaran

The Manta 42 is an evolution of the successful 40-footer which established the Florida company at the forefront of the US cruising catamaran market. Perfectly adapted to short-handed sailing, she features a unique camber-spar jib which is self-tacking. Unlike most production multihulls the Manta 42 has a laminated forward crossbeam, which is arched well over the waterline to reduce impacts in heavy seas. A very substantial stainless-steel aft-arch structure is available, which acts as antenna...

Draft

Recondition Battery Guide

Many of the planet's most beautiful anchorages and harbors lie in the remotest regions and most can only be accessed by vessels with a 4' or less draft. This is one of the reasons monohull designers have gone through great efforts to shave inches off 7' plus keels. On one hand they try to preserve the necessary stability yet need to balance it with the need of a shallower draft. The multihull does not need a deep ballasted fin to remain upright and can get away with twin low-aspect-ratio keels...

Oib

Safety lines running along the deck used to attach a tether from a safety harness. A triangular sail attached to the headstay. A jib that extends aft of the mast is known as a Genoa. Jibe (also gybe) To change direction when sailing in such a manner that the stern of the boat passes through the eye of the wind and the boom changes sides. Careful control of the boom and mainsail are required when jibing to prevent a violent motion of the boom when it switches sides. A sheet used to control the...

Jaguar

Battery Reconditioning Review

The Jeff Schionning-designed Jaguar 36 is another highly popular South African cruising cat. In the last years, she has been built in great numbers and has earned her reputation as a good sailer at a reasonable price. The volume in the saloon rivals that of 40-foot multihulls, thanks to her extra-wide beam. As long as care is taken not to overload the boat, the bridgedeck clearance will be adequate for offshore sailing. A fractional sail plan assures that a couple can master the boat from a...

Catamaran Jib Camber

Cut Away Photo Catamaran

The main driving power of the working sail plan of a multihull is derived from its mainsail. Typically they are fully battened and loose-footed to permit maximum camber adjustment. Due to the higher speeds of multihulls, sails are frequently cut much flatter and, generally, are also of heavier construction than those on a monohull. Mainsails can have large roaches, which increase their area up high, where it counts. Winds aloft usually are stronger, and being able to capture them is of great...

The Magic of Apparent Wind

In order to fully understand key seamanship issues, the phenomenon of Apparent Wind should be recognized, since most of them relate to this fascinating principle. Probably the first thing monohull sailors will notice when sailing a high-speed catamaran is the fact that a large percentage of the time the wind is forward of the beam. The reason is that a multihull is faster and draws the Apparent Wind forward. Apparent Wind is comprised of several components the speed and direction of travel of...

Ph O To C Re Di Ts

Sailboat Reference

Atelier Outremer 12, 32, 44, 69, 74, 77, 1G7, 116,166, 17S, 23G, 231 Bailey, Nic 13S Blubay 65, 7G, S7, 94, 97, 2GS, 2G9 Martin-Raget, Gilles 2, 6, 11, 13, 15, 17, 22, 26, 27, 29, 33, 34, 3S, 39, 41, 42, 45, 51, 54, 57, 59, 63, 64, 66, 73, SG, S1, S3, S5, S6, SS, S9, 9G, 9S, 1G1, 1G3, 1G5, 1G9, 11G, 133, 134, 146, 147, 149, 162, 165, 169, 173, 174, 177, 1S1, 1S3, 1S5, 193, 199, 2G2, 2G5, 216, 217, 249, 259, 265, 267 Multihulls Magazine 19, 21 PDQ 232, 233 Performance Cruising S4, 21S, 219 Scape...

Apparent Wind vs Course

Note how in the diagram the (blue) True Wind vector is always the same length as it represents equal strength on all points of sail. The Apparent Wind (red) however, changes dramatically in strength and direction, especially on an upwind course. This example illustrates why it is often more advantageous to tack downwind rather than sail on a dead run. On a straight downwind course, the Apparent Wind will diminish as the (yellow) Boat Wind will cancel out part of the True Wind. On a reach and...

Seawind

Diy Catboat

The Seawind 1160 is built in Australia and is the newest addition to the fleet of mid size cruisers from Down Under. She has expanded on the concept of an open floor plan - cockpit saloon, but also successfully allows the bridge deck to be closed in and secured by an innovative trifold-mechanism door arrangement, which stows the doors into the fiberglass bimini overhead. As a result one gains an unequaled living space, but at the same time enjoys the security of a conventional catamaran layout....

Procedures for Winter LayUp

Secure and isolate electric circuit. Remove all sails from vessel and have them checked and cleaned by a sailmaker. Arrange bedding and linen in such a way that they are well aerated. Check that entire vessel is well vented. Remove and lift floorboards to vent bilges. Close 12V circuit (except automatic bilge pumps if you are afloat). Check the antifreeze level in your engines. Winterize outboard by flushing with fresh water and spraying appropriate machine oil into...

Catana

Catana Catamaran

The Catana 52 represents a high-tech production catamaran, which is equipped with retractable daggerboards, a rarity on today's market. She is constructed using aramid fibers in her composite skin and her standard gear includes items such as a washer dryer, watermaker and a carbon mast. A smart, passive ventilation system, flat decks, which facilitate getting about the boat, and centralized sail controls are just some of the innovative features of the Catana. Unique design details are her...

Gybing

In contrast to performing this death-defying maneuver on a monohull, gybing is child's play on a catamaran, thanks to its wide traveler. On a monohull gybing can be an act of terror as the boom cannot be braced as well. Often, as a monohull goes through the wind, the sudden heeling and momentum shift caused by the gyration around the keel whips the boat onto the other tack. In extreme conditions monohulls can even broach. Gybing on a monohull in To properly gybe a cruising catamaran, trim the...

S

A device worn around a person's body that can be attached to the ship to prevent the person from being separated from the ship. The shape of a sail, with regard to its efficiency. In high winds, a sail would probably be flatter, in low winds rounder. Other circumstances can cause a sail to twist. Controls such as the outhaul, halyards, sheets and the bend of the main mast all can affect sail shape. The position of the sails relative to the wind and desired point of sail. Sails that are not...

Stall Recovery

Maneuver Power Off Stall

In the worst case scenario you can stall during a tack, when there is not enough momentum, or did not sheet in the jib quickly enough. This is not a disaster, as a catamaran can be sailed backwards smartly. All you have to do is release all sheets and, as the multihull is pointing into the breeze, the wind will push you back as if reversing a car. With the wheel turned to point the bows onto above The aft sun porch is a place for the entire family, and conveniently houses everything from...

Dolphin

The Dolphin 46 is a cruising catamaran, built in Brazil. Her interior is richly finished with local hardwood trim, teak-type flooring, and finely fitted cabinetry. Her twin daggerboards help her point going to windward and reduce resistance when sailing off the wind. She sports a semicircular saloon table, providing space for 8, while the cook has an unobstructed view from his forward facing galley. Nearly vertical saloon windows help reduce heat radiation from the tropical sun and her built in...

Blubay

Hemisphere Catamaran

With the recent introduction of Allures in Cannes, France, the first of the Blubay 100 series of super cats has been launched. This mega catamaran can only be described in superlatives, as no expense has been spared to create not only one of the most beautiful and comfortable, but also the fastest superyacht in the world. Allures will be able to travel in excess of 35 knots rivaling any vessel at sea. Daggerboards can reduce her draft, providing access to shallow harbors, which would normally...

Roll Angle vs Human Effectiveness

Studies by Warhurst and Cerasini of the Naval Ship R& D Center discovered that at a slight roll and heel angle, a human actually becomes more alert and his performance increases. However, as the roll intensifies, effectiveness and fatigue deteriorate until total incapacitation is approached beyond 45 degrees. Roll behavior of monohulls is quite different than that of catamarans. As waves are traveling from left to right, the multihull strictly conforms to the slopes, whereas the ballasted...

Catamaran Blueprints

Recondition Battery Guide

The Maine Cat 41 is a little masterpiece, built in Maine by craftsmen who have also produced the popular Maine Cat 30. The new 41-footer maintains the tradition of an open bridgedeck design, good sailing performance and a practical and exceptionally well-finished interior. This daggerboard-equipped cat can easily be single-handed from a central wheel and navigation station located in the forward part of the cockpit. In inclement weather the entire bridge deck can be converted into an enclosure,...

Objective Mission Profile

My mentor and part-time lecturer Dick Newick, a personality whom I regard as one of the most prolific multihull designers of all time, summed it up Space, Efficiency (low price) and Performance. You cannot have all three characteristics in a multihull. Two out of three, yes. For instance, you will soon find that a fast and spacious multihull will be expensive but, consequently, you can find a well-performing catamaran that will not break the bank but has little room. A multihull with a huge...

Outremer

Catamarans

The Outremer line of catamarans belongs to one of the most proven and tested multihulls in the world. More than 160 of these performance-daggerboard cats have been constructed in a period of 25 years by the specialist builders from the south of France. Throughout virtually millions of ocean miles Outremers have demonstrated their seaworthiness and ability to safely sail through the worst weather. Centered weight, high bridgedeck clearance and efficient hulls provide excellent performance under...

Index Of Illustrations And Tables

Airflow & Sail Turbulence, 172 Apparent Wind & Acceleration Curves, 175 Apparent Wind vs. Course, 180 Articulating Underwater Appendages, 121 Asymmetric Spinnaker Controls, 180 Barber Hauler to Provide Better Headsail Shape, 174 Basic Catamaran Configurations, 93 Beaufort Scale, 263 Best Upwind Course VMG, 168 Catamaran Stability Considerations, 104 Catamaran Stall Recovery, 188 Course & VMG Cosine, 47 Decision Parameters, 38 Deliberate Raising of Daggerboards, 124 Displacement vs....

Efficiency

The efficiency of a sailboat can be best expressed in how certain performance levels are achieved. We will compare the Displacement Length Ratio, Sail Area Displacement ratio and see how the all-important stability is achieved in both mono and multihulls. The Power to Weight ratio (or Sail Area Displacement Ratio) is one of the most important efficiency indicators in a sailboat. The higher the number the faster the boat will sail. The driving power of any sail-driven craft is the energy of the...

Acknowledgements

Catamarans

There are many individuals who contributed to Catamarans. Most are mentioned below. However, there are countless people who, in one way or another, developed my sense for multihulls and the sea, either by having taken me out for a sail or sharing ideas that I would never have come across otherwise. Sailing is an art and it is the hands-on experience of these people and various mentors that gave this book its invaluable reference content. We must never forget that we all profit from their...

Hull

Catamarans

A boat's hull shape and the distribution of volume are key factors in determining how it will behave in varying wind and load conditions. The underwater characteristics of a vessel are responsible for allowing a multihull and its cargo to travel through the water. The faster and more effortlessly the twin hulls can displace the surrounding fluid, the less resistance and more efficient a catamaran will be. Typically modern catamaran designs have sharp bows to drive the vessel through the seas...

Rudders

Recondition Battery Guide

While mini keels and daggerboards provide lateral resistance to leeway, rudders allow directional control and steerage. Catamarans always have twin rudders which contribute to their safety. Having reliable steerage on any cruising boat is essential and cannot be overestimated. Twin rudders provide positive redundancy, superior tracking, and reduce the loads on autopilots. Just as the majority of today's cruising catamarans are mini keelers, 90 of them are also equipped with fixed spade rudders....

Fountaine Pajot Eleuthera

Catamaran Appendages

Starting from her introduction in the Fall of 2004, the Eleuthera 60 became Fountaine Pajot's flagship and instant success. As one of the largest one-piece infusion composite structures in the world, this catamaran not only enjoys the 30-year experience from the world's oldest multihull builder, but also a bulletproof construction, which will assure longevity and good resale value. As with all Fountaine Pajot cruising catamarans, emphasis is placed on excellent sailing performance, reliability...

Safety

Catamarans

The fact that well-designed and constructed cruising catamarans are unsinkable makes them - at least in my mind - the safest platforms to cross oceans in. Usually their higher average speeds, shallower draft will also provide you with an active safety margin and their stable - non-heeling - platforms create a more secure operating environment. All these vital safety characteristics, essential to ocean cruising are lacking in a monohull. below The author's 43' catamaran, beached at low tide to...

St Francis

Francis Cruiser Versions

St Francis Marine is one of the oldest boatyards in South Africa that manufactures catamarans, having built the first boat back 1988. Last year the yard celebrated its 50th launch with its new flagship, the St Francis 50, considered a high-quality world cruiser. She features the same attention to detail as her smaller sistership, the popular 44. The yard's innovative thinking in designing basic gear, such as the retractable boarding ladder, self-stowing cockpit gate, multi-functional cockpit...

Pdq Antares

Privilege 495

The Antares 44 is the flagship of PDQ Yachts of Canada. Well known for their popular 32' and 36' models, the Antares combines good sailing characteristics with a spacious, liveaboard interior. Extra volume has been achieved by raising the topsides of the hulls, and although this might create more windage and give the boat a boxy look, the space gained is considerable. As with the earlier vessels the boat features a hard, full-width bimini, which supports the main traveler and twin solar panels....

Daggerboards

The majority of today's cruising catamarans are equipped with mini keels for reliable and hassle-free operation. There are fewer than a handful of production daggerboard catamarans, which provide the sailor slightly more pointing ability and other advantages as illustrated in previous chapters. Their operation is generally straightforward via either a single uphaul line in case the board is heavier than water, or by an additional downhaul to keep the foil lowered, in case it is more buoyant....

Space

Antares Pdq Catamarans

Usually the very first comments boat show visitors make when stepping aboard a large cruising catamaran is related to the vast amount of room as compared to an equivalent length monohull. Close to ideal cockpit shelters, large amounts of storage, and 360-degree saloon views are just some of the space and layout advantages of multihulls. Thanks to the wide beam of a multihull its volume is much more than meets the eye. We all know that for every additional foot in length, the interior of a...

Desirable Attributes

Below Gennaker sailing at its best This large headsail can be quickly furled and provides instant horsepower when needed. Gennakers, also known as screachers, can even be flown in fresh conditions when running downwind. Safety and seaworthiness, as Czeslaw A. Marchaj describes in his great book Seaworthiness - the Forgotten Factor, should be one of the most important considerations when shopping for a boat. There will be many parameters to consider when buying a particular cruising multihull,...

Present Environment

Team Philips Catamaran

So do they flip Long gone are the days when monohull sailors asked that question. At today's boat shows it is more an issue of How many does she sleep The global charter industry, which is a multibillion dollar enterprise, has embraced the multihull as a profitable platform. The notion of solo sailors pushing their giant catamarans or trimarans across the ocean has proven them not only as blindingly fast competitors, but also has demonstrated the multihulls' toughness in the worst sea...

Composite Aluminum

Pvc Production Airex

Would rather take a boxy, heavy, but well-constructed boat to sea than a dubiously assembled fast racer. In fact, I would prefer to cross the bay in a well-built monohull before risking my life on an inadequately built catamaran. Most sailors will agree that careful construction, especially when it comes to multihulls, cannot be underestimated. Any boat venturing into the ocean must be built by exacting engineering principles and construction methods. Wide beamed catamarans will experience more...

History Abbreviated

Polynesians and Micronesians as far back as the 1700s used double canoes, and these were the forerunners of today's catamarans. In 1778 Captain James Cook wrote in his logbook about the enormous sailing craft that 'could carry a hundred warriors.' Indeed, there were all kinds and sizes used in inter-island travel. Some were small dugouts with single or double outriggers others were 15 meters 50 feet long. Captain Cook recorded sighting a war canoe in Tahiti, estimated at about 110 feet long and...

Heavy Weather Tactics

Scores of books have been written about heavy weather sailing, but few of them address the particulars of multihulls and their individual considerations. Monohulls have more commonalities as a group, therefore there are more general guidelines. Storm tactics for multihulls will depend more on the capabilities of crew and vessel than any other factors. Barreling along at 18 knots in strong winds can be thrilling and is a highlight of multihull sailing. Making no seamanship errors will be as...

Airflow and Sail Turbulence

Barber Hauler Catamaran

Downwind, when wind angle is the greatest, turbulent zones behind and on the perimeters of the sails are the greatest. With proper sail adjustment, airflow is smoothest on a reach, running nearly parallel with the boom angle. This is also the point of sail where forward momentum is maximized. Upwind the wind is compressed by the jib and mainsail resulting in smaller pressure vortexes to leeward. Except on a downwind course, telltales are the best indicators for proper trim. it there until you...

Sailhandling Monohull vs Multihull

Monohull Multihull

Sailing trim on a catamaran does not differ greatly from that on a monohull, yet to a large extent it will depend on your experience, the actual boat you sail, and your perspective. Since the basic sailing concepts apply to multihulls as well, you'll find the experience similar to monohull sailing with subtle but important differences. Those new to the sport have few preconceptions about how a multihull should perform. They find multihulls relatively easy and forgiving boats to learn on as they...

Appendages

Daggerboard Trumk

Charter industry has a pronounced influence on the requirements and design of their fleet, setting standards for cats intended for private ownership. Design parameters for these vessels are often centered around 2-week multiple family vacations in the steady Trade Winds and daysails between closely spaced islands of the Caribbean. Obviously, the features of these keel catamarans put less demand on pure sailing performance or extreme upwind sailing characteristics instead they please by offering...

Voyage

Sailboat Reference Pictures

The Voyage 500 design is an evolution of the Norseman 43 that has been around for several years. Built in South Africa, the boat has vacuum-bagged, PVC-cored hulls with watertight compartments forward in both hulls, as is typical for modern cruising catamarans. Displacing 23,200 pounds, the 500 is not the lightest cat in the cruising fleet, but having fairly narrow hulls and a decent sized sailplan, allows the boat to move well, even in light winds. The interior styling of the 500 is clean and...

Atlantic

Catamaran Design Ratios

The Atlantic series of catamarans are the original center-cockpit, aft-pilothouse design multihulls. Designed by Chris White in 1984 they have gone through 22 years of continuous development and provide cruising sailors with a blend of comfort, safety and sailing performance. Construction is modern epoxy glass carbon composite and the boat is built in Cape Town, South Africa. The outstanding feature of the Atlantic 55 is her center cockpit, situated ahead of the saloon coachhouse. Although one...

Downwind

Colorful Spinnakers

Generally, the spinnaker and gennaker are the two types of sails which are utilized for downwind or reaching conditions. Which sail to choose will depend on your intended course, wind speed and sea state. Both types can be very powerful so they should be treated with respect, especially when one is sailing short-handed. The ability to furl them at any time is imperative. In speeds varying from 5 to 20 knots true, the gennaker or screacher , depending on the cut, can be utilized to sail as close...

Switch

Pvc Catamaran Plans

The new Switch 55 is built in the South of France by Sud Composites and is intended for comfortable bluewater sailing with a small crew. The hulls are molded using vinylester, PVC-sandwich composite for light weight and stiffness, while the interior furniture and bulkheads are made of balsa-sandwich panels with hardwood veneers. Reminiscent of the lines of the older Lagoon 47, she carries a cutter rig and a bowsprit arrangement for the asymmetrical spinnaker or gennaker. This practical sail...

Catamaran Design Guide

Catamaran Proportions

Spectacular sunsets in the Pacific turn the horizon into a brilliant spectrum of gold and orange colors. Copyright 2006, 2008 by Gregor Tarjan. Click here for terms of use. performance, yet desire high daily averages and passage times, which should be as short as possible. When choosing a large multihull, sailors look, above all else, for safety and comfort, long before the consideration for flat-out speed comes into the discussion. Nevertheless, performance is a highly important design...

Catamaran vs Monohull

Mono Hull Catamaran Advantages

Below An Outremer 50S tuning before the start of the famous La Route du Rhum. In order for us to appreciate the advantages of a catamaran it is important to be aware of their different attributes as compared to their ballasted counterparts. Although both types of vessels rely on watertight hulls to safely separate seawater from precious cargo on the inside, their stability is achieved via totally different means. Data of a typical 45' monohull will be compared to a 45' cruising catamaran,...

K

Kanter, Charles E., Cruising in Catamarans, Sailco Press, Key Largo, FL, 2002 Kanter, Charles E., Cruising on more than One Hull, Sailco Press, Key Largo, FL, 1992 Kanter, Corinne C., The Galley K.I.S.S. Cookbook, Sailco Press, Key Largo, FL, 1987 Kelsall, Derek, Catamaran Sailing, The Crossword Press, London, UK, 1992 Kinney, Francis S., Skene's Elements of Yacht Design, Dodd, Mead amp Company, NY, 1981 Knox-Johnston, Robin, A World of My Own, W.W. Norton amp Comp., NY, 1970 Kotsch, William...

Gunboat

Gunboat Project

The Gunboat is built in South Africa, out of high-tech aramid composites and introduces a fresh, new concept to performance sailing. The idea of separating the social from the steering cockpit is not a new idea, yet Peter Johnston and his company have taken it one step farther. Low resistance hulls and ultra-low displacement allow 300-mile-per-day runs in ideal conditions, distances which only large racing yachts achieve. Although the interior is not as plush as comparable cruising catamarans',...

Docking Under Power

Aft Docking Catamaran

Maneuvering a multihull under sail in tight anchorages, or around docks, requires some practice, particularly with cruising cats that lack good crisp response to the helm. Give yourself some additional time and distance to turn, and be aware of how quickly a multihull can accelerate in a gust or come to a stop once headed into the wind. Play your main and jib just as you would with a monohull. However, it is best to approach a dock under power, with all sails dropped for maximum control. below...

Design Dynamics

Sailcraft Cherokee Catamaran

Amultihull, just as any other type of boat, presents a series of compromises, and this applies to overall hull, deck and configuration as well. Concessions often have to be made because of space, performance or construction costs. In addition, the intended usage will be a significant factor in determining the shape and size of the vessel. Successful cruising designs will balance all parameters and only you, as a sailor, will know which type of catamaran will be suitable for your needs. A...

Reefing

Catamarans

The reliability of a simple reefing system is imperative. As much as they are a great help to monohulls, rarely do we see in-boom furlers or in-mast reefing systems on multihulls. Their higher loads and the fact that most multihulls have fully battened mainsails, which makes even in-boom furling complex, don't lend themselves to any other way of reducing sail except the slab or jiffy reefing system. This is by far the mostly reliable and best system to reduce the size of a catamaran's mainsail....

Configuration Types

Catamaran Biplane Rig

Sailing in strong winds, deeply reefed, is one of the great pleasures of multihull sailing. With a properly reduced sail plan your boat might feel undercanvassed, yet will still show stellar performance. In contrast, a monohull might experience wild rolling and gusts will flatten her on her beam ends. A catamaran's easily driven hulls and highly stable platform have required designers to adapt the sail plan for a variety of operating conditions. Wide beam has great advantages of holding up the...

Is Sailcraft Cherokee A Blue Water Catamaran

Cherokee Catamaran

Above A Pahi 31, one of the many hundreds of James Wharram-designed catamarans sailing throughout the world. want to be left behind. They invented their own ocean races, the best known being La Route du Rhum, Saint Malo to Guadeloupe. It is run every four years, alternating with the British races. Other major races are the Qu bec-to-Saint Malo race, and the La Boule-to-Dakar Race. These events attract hundreds of thousands of sailing fans at the starting and finish lines and millions of TV...

Hill

International Marine McGraw-H i 11 Camden, IVlaine Lisbon -London San Juan - S - New York Chicago - San Francisco IVladrid - Mexico City - IVlMan - Mew Delhi eoul - Singapore - Sydney - Toronto Copyright 2006, 2008 by Gregor Tarjan. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval...

How Are Catamaran Masts Fixed Down

Multihull Free Standing Mast

Most masts on production multihulls are fixed, non-articulating, aluminum extrusions and are therefore preferred for their reliability. above Yves Parlier's radical Hydraplaneur showing her advanced stepped hulls and biplane rig. Note how the masts are stepped on the crossbeams and not on deck this reduces compression loads and allows a lighter build. Shroud, forestay and leach tensions are counteracted by the compression of the mast on the central crossbeam, necessitating this critical zone to...

VMG vs Boat Heading

Performance sailors use the acronym VMG Velocity Made Good to express boat speed relative to the direction of the wind. The concept holds that for any given sailing condition and desired course, there is a single combination of boat speed and true wind angle that equates to the optimum VMG. On any point of sail -upwind or down - the longer we can maintain the best VMG, the better our cumulative performance. VMG boat speed x cosine angle sailed to the true wind . In this particular example, it...