- MILITARY PEDIGREE
- NEWS & MEDIA
M48: PUTTING THE WORLD WITHIN REACH
From its chiseled profile and imposing stance to the amazing combination of speed and range afforded by its high-efficiency catamaran hull design, M48 defies convention at every turn and is like nothing else on the water.
This 48-meter, three-decked, all aluminum catamaran is a rugged and capable purpose-built oceangoing craft enabling global exploration and delivering self-sustaining independence for months on end.
Among the many advantages of Metal Shark’s high-efficiency Incat Crowther catamaran hull design, M48 delivers nearly twice the range of a comparably sized traditional monohull yacht. At a long-range speed of 10 knots, M48 boasts an unbelievable 11,000 nautical mile range. At a 17-knot cruise speed, M48 delivers an impressive 4,500 nautical mile range, and still offers a range of over 2,500 nautical miles at a 23-knot sprint speed, all while offering unparalleled ride, shallow draft capability, and increased stability while at rest.
M48’s unique combination of speed and range opens up myriad opportunities for exploration and adventure on the fly, without need for an elaborately planned itinerary. Travel from New York to Miami in under 48 hours. Cross oceans with ample fuel to accommodate any change of plans. And, wherever your destination may be, you’ll enjoy unmatched independence as M48 becomes its own self-sustaining island, with robust off-grid capabilities that allow you to drop anchor in any harbor and stay for as long as you like.
M48 boasts a sleek and modern elevated interior that imparts the feel of a high-end city apartment. A panoramic window treatment and tasteful, refined interior finishes put the emphasis on the journey, enveloping occupants in spacious, uncluttered surroundings while affording unmatched views of the outside environment. The expansive sun deck is ideal for entertaining, with large wraparound seating and lounging areas affording stunning views from a lofty elevation. An integrated submersible stern platform with a 5,000 capacity and a 3,500 lb. aft deck crane easily launch, retrieve, and stow tenders, toys, subs, and cargo.
Magnet’s appearance is as unique as her mission. The vessel’s assertive styling incorporates chiseled lines inspired by Metal Shark’s military patrol vessels, which are designed to achieve modern naval visual deterrent requirements. Hardware is rugged and overbuilt. Angular brows lend an imposing look while shielding the vessel’s expansive windows from the sun. Exposed architectural elements and an industrial-grade finish, designed for extended operation with minimum maintenance, combine to convey the vessel’s no-nonsense demeanor.
The first M48, “Magnet,” launched in 2020, with a bespoke arrangement designed to meet the unique requirements of her owner. Magnet has been configured with a master cabin, a VIP cabin, and three guest cabins. However, each offering in the Metal Shark Yachts lineup may be fully customized to suit the unique requirements of the owner. With its enormous 393 meters (4,230 square feet) of interior living space, M48 can easily be configured to accommodate additional guests or crew. To begin the process of configuring your very own Metal Shark Yacht, Contact Us today.
KEY SPECIFICATIONS
Principle Dimensions Length: 48 meters / 158′ Beam: 12 meters / 39′ Draft: 2 meters / 6.7′
Performance: Long Range: 11,000 NM @ 10 Knots Cruise: 4,500 NM @ 17 Knots Sprint: 2,500 NM @ 23 Knots Lightship Full Speed: 27 Knots
Propulsion: 2 x MTU 16V2000M96L with SCR (1939 kw / 2600 BHP)
Fuel Capacity: 110,000 Liters / 29,000 US Gallons
Displacement: Lightship: 240 Metric Tons Full Load: 350 Metric Tons
Tonnage: US Gross Register Tonnage: 290 US Net Tonnage: 197 ITC Gross Tonnage: 653 ITC Net Tonnage: 195
Submersible Stern Platform: 2268 kg / 5,000 Lbs Lift Capacity
Download Detailed Specifications
M48 IMAGE GALLERY
Model range, m30 • 30 meters / 100', m48 • 48 meters / 158', m70 • 70 meters / 231'.
Log in or Sign up
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser .
9m Steel Catamaran; thoughts?
Discussion in ' Boat Design ' started by rustybarge , May 20, 2016 .
rustybarge Cheetah 25' Powercat.
Hi All, Can steel make a good materials choice for a small 30' Cat for home building, , and what plus/minus points does 3mm plating pose? http://www.bodenboatplans.com/popup_image.php?pID=23&image=0 http://www.bodenboatplans.com/popup_image.php?pID=23&image=1 BB260 "Steel Catamaran 9 Metre" $595.00 Length 9.0 m Displacement 6500-7500 kg Material Steel Hull Draft 0.85 m LWL 7.9 m Hull Weight 4500 kg steel Beam 3.8 m Max Speed 12 kn Motor capacity 2 x 60 hp Fuel Type Diesel Fuel Capacity 700 litres 100mm x 50 x 3mm cross beams folded plate Fabricated frames 3mm flanged plate. 30 x 3 mm stringers. 2.5 mm superstructure . . A 9 metre steel power catamaran for long distance economical cruising. The alternative way of spacious live a board cruising under power. Also available in aluminium construction and a 4 stroke outboard version in steel or aluminium. An exceptional design. There is nothing else like this seagoing cat on the internet Steel, or steel extended version , also aluminium construction with extended cabin and flybridge Single chine catamaran Hull tunnel to waterline is 300mm loaded and 370mm light Propeller dia 400mm. Fresh water 200 litres. Sewage tank 60 litres. Intended for living aboard for extended periods in the Med. where provisions are available on a weekly basis. This craft was designed so that all nominated fitting out items including tanks etc. were available from the Vertus catalogue, which is readily available world wide. Accommodation is two double berths forward, galley and dinette in wheelhouse saloon. The cockpit is relatively large and is ideal for relaxing outdoors. The shower/toilet space is unusual in that the toiler is located at a lower level on one side and the shower on the starboard side. There is internal entry to each of the machinery spaces with larger maintenance hatched in the cockpit. Sub division with bulkheads make this a very safe boat. The engines shown in the plan are 60hp Dutz as shown in the Vertus catalogue At first we thought that a 9 metre steel catamaran would not be practical. A preliminary design established that providing it was built in 3mm plate,with fabricated frames and tunnel beams,a satisfactory design was possible. The hulls are deep to carry the additional weight and the craft is designed to run at displacement speed with initial estimates indicating a top speed of 14 knots and a very economical cruising speed of 10 knots. Particular attention has been given to the machinery installation with the hull aft designed to accommodate the propellers, reduce draught and enable the catamaran to sit on the bottom. The original craft was designed in 2002 for use cruising the Greek islands. The advantage of steel is that the craft can be built in the open and shot blasted and epoxy painted on completion of the steel fabrication. Click to expand...
Stumble Senior Member
Let's see.... The design displacement is roughly four times what a 30' cat should weigh, and the speed is pretty marginal. Setting aside the difficulty in welding steel this thin, you would be far better buying a 30' fiberglass sailing catamaran and adding bigger engines. It would be pretty inefficient compared to a designed power cat, but still far better than this.... Thing.
Stumble said: ↑ Let's see.... The design displacement is roughly four times what a 30' cat should weigh, and the speed is pretty marginal. Setting aside the difficulty in welding steel this thin, you would be far better buying a 30' fiberglass sailing catamaran and adding bigger engines. It would be pretty inefficient compared to a designed power cat, but still far better than this.... Thing. Click to expand...
fredrosse USACE Steam
Actually no difficulty welding this steel thickness with a wire feed machine. Stick welding would be difficult for me, but I am no professional welder. With a quality MIG machine even I could weld very well for a thin steel hull. Cutting the steel with an abrasive wheel is also easy, with virtually no distortion. Steel weight for 3mm thickness is about the same as 35mm plywood, whereas in plywood you could use 20mm thickness. So the hull plating in steel is considerably heavier than with plywood, but most of us know that already. Steel hulls, with a good coating system, can hold up very well, and if that is your preference, then proceed to get what you want.
fredrosse said: ↑ Actually no difficulty welding this steel thickness with a wire feed machine. Stick welding would be difficult for me, but I am no professional welder. With a quality MIG machine even I could weld very well for a thin steel hull. Cutting the steel with an abrasive wheel is also easy, with virtually no distortion. Steel weight for 3mm thickness is about the same as 35mm plywood, whereas in plywood you could use 20mm thickness. So the hull plating in steel is considerably heavier than with plywood, but most of us know that already. Steel hulls, with a good coating system, can hold up very well, and if that is your preference, then proceed to get what you want. Click to expand...
Richard Woods Woods Designs
I doubt if you will get 14 knots with twin 60hp on a 7.5T catamaran. Has someone achieved that speed with one? I recall you have posted before about the powercat you were building. So I am pretty sure you know my Skoota 28, which is, as Stumble says, nearly a quarter the weight of the steel boat. The hulls are 6mm, the decks 9 and 12mm. Yet has proven to be a successful live aboard cruiser. My Skoota 32 is currently being built and will be under 3T in the water If you think that a steel boat will be cheaper remember to add in the cost of bigger engines and the running costs. I suspect the bridgedeck will slam as heavy boats need higher clearance The 9m Catalac doesn't weigh 7T! Richard Woods of Woods Designs www.sailingcatamarans.com
Richard Woods said: ↑ I doubt if you will get 14 knots with twin 60hp on a 7.5T catamaran. Has someone achieved that speed with one? I recall you have posted before about the powercat you were building. So I am pretty sure you know my Skoota 28, which is, as Stumble says, nearly a quarter the weight of the steel boat. The hulls are 6mm, the decks 9 and 12mm. Yet has proven to be a successful live aboard cruiser. My Skoota 32 is currently being built and will be under 3T in the water If you think that a steel boat will be cheaper remember to add in the cost of bigger engines and the running costs. I suspect the bridgedeck will slam as heavy boats need higher clearance The 9m Catalac doesn't weigh 7T! Richard Woods of Woods Designs www.sailingcatamarans.com Click to expand...
Here's a commercial steel cat, just slightly bigger ...lol. http://nbcommercialboatsales.com.au...ommercial-vessels/24-m-steel-catamaran/133490
waikikin Senior Member
rustybarge said: ↑ My project is to home build a small coastal cruising cat on a small budget. The advantage of steel is easy welding; alloy needs an experienced expert . The materials for a 30' plywood cat come to about $20k using good quality marine ply. Here in Europe steel is at an all time low of £300/ton because of Chinese dumping and oversupply from European mills. I estimate £2k would cover the material costs in steel. Click to expand...
SamSam Senior Member
9m Steel Catamaran; thoughts? Click to expand...
waikikin said: ↑ Rustybarge, Steel wins as a low cost start to fabricate, the other materials soon catch up when you factor in abrasive blasting and paint system....welding consumables/gas/ abrasive discs are a minor add on but add up, then you need to build the interior which generally means lining the habitable areas which in effect is building a thin ply/laminate boat inside much of the steel one. It would be one tough little cat, one was for give away incomplete in Wollongong a few years back. At the other end of the project you would have a tough, comfy, slow piece of paradise..... on resale which you may not care about could be very low. Cecil E was a respected designer of commercial craft and some pleasure craft. If he was designing today in the market available that boat might be very different than presented. I'd never say don't build it but keep your eyes wide open at the big pic. Al the best from Jeff. Click to expand...
SamSam said: ↑ It's in your moniker rustybarge...rust. In thin steel, a corrosive pit is halfway through the skin. The worst is from the inside out, from condensation. I imagine creating and maintaining a protective coating in all the nooks and crannies inside those narrow, deep hulls would be a chore. Click to expand...
rustybarge said: ↑ This problem had occurred to me, especially if there are parts of the frames with doublers . how do you stop corrosion once its got into two thin steel plates spot welded together? I suppose after good layer of two pack paint, some sort of wax treatment like waxoil could be injected into overlapping sections of the steel work. But is plywood any better if it gets wet and starts rotting, and how would you dry it out in narrow hard to get at sections? Click to expand...
whitepointer23 Previous Member
what about alloy glued instead of welding. i read somewhere that alloy boats can be glued together just like plywood. i think the bond is also a lot stronger than glued ply bonds. even a combination of epoxy and rivets like an aircraft.
- Advertisement:
waikikin said: ↑ Well you need to seal weld the perimeter, I'm assuming you're indicating the gussets? lapping the framing. The "secret" with steel or timber for that matter is ventilation and limbering(drainage holes), an effective paint scheme is very important to steel, access to or elimination of void areas as well. The 3K structurally complete cat is fantasy if including coatings even in Pound$. A plywood or composite cabin may be ok if the landing/upstand/coaming is in staino, the fastenings required generally compromise coatings to steel & eventual results blow up with oxygen mixing with steel Jeff. Click to expand...
Designing Stainless Steel Pontoons for a Big Houseboat/Floating House
Where to Source Steel Boat Plans and Introduction
Stainless Steel Pontoons for Houseboat
42 foot steel round bilge sailboat scantlings
steel reinforced fiberglass?
Need help- Lines plan of steel fishing vessel
Steel Hull Insulation Recommendation
From Army idea, 4 mt. Diamond monocoque with Sika adhesived 0.7 mm stainless steel
Study model for 1940's steel Fish Tug, construction details needed
Yrvind 4.2 mt. cold molding adhesived 3 layers of 0.4 mm stainless steel stripes.
- No, create an account now.
- Yes, my password is:
- Forgot your password?
Did You Know That We Offer Contract to Closing Services? Click Here to Find Out More.
Need Marine Financing? Apply Here With Our Partner, First Approval Source
- Catamaran Interviews
- Catamaran Reviews
- Buying Advice
- Selling Advice
- Woods Design Advice
- Admiral 38
- Admiral 40
- Admiral 50
- Americat 3014
- Antares 44
- Aquila 44
- Aquila 48 Power Catamaran
- Aventura 37
- Balance 442
- Balance 482
- Balance 526
- Bali 4.0
- Bali 4.1
- Bali 4.2
- Bali 4.3
- Bali 4.4
- Bali 4.5
- Bali 4.6
- Bali 4.8
- Bali 40 Catspace
- Bali 5.4
- Bali Catsmart
- Beneteau Blue II
- Broadblue 346
- Broadblue 38 Prestige
- Broadblue 385
- Broadblue 435
- Broadblue 46
- Rapier 400
- Rapier 550
- Catalac 10M
- Catalac 11M
- Catalac 12M
- Catalac 8M
- Catalac 900
- Catalac 9M
- Catana 381
- Catana 39
- Catana 401
- Catana 40S
- Catana 411
- Catana 42
- Catana 42 S
- Catana 431
- Catana 44
- Catana 471
- Catana 50
- Catana 521
- Catana 531
- Catana 55
- Catana 581
- Catana 65
- Catathai 44
- Chris White
- Chris White 48 Voyager
- Chris White 55
- Condor 40
- Contour 34
- Corsair F28 R
- De Villiers
- Dean 365
- Dean 400
- Dean 440
- Dean 500
- Dix DH550
- Dolphin 380
- Dolphin 460
- Edel 35
- Endeavour 30
- Endeavour 35 Victory
- Endeavour 36
- Endeavour 44
- Endeavour 44 TrawlerCat
- Endeavour 50 Pilothouse Trawler
- Excess 11
- Excess 15
- F-41
- Fastback 43
- Fastcat 445
- Fisher 28
- Fisher 32
- Fortuna 36 Island Spirit
- Fortuna 401 Island Spirit
- Fountaine Pajot
- FP 32 Maldives
- FP 35 Tobago
- FP 36 Mahe
- FP 37 Antigua
- FP 38 Athena
- FP 39 Fidji
- FP 40 Isla
- FP 40 Lavezzi
- FP 40 Lucia
- FP 40 MY
- FP 40 Summerland MY
- FP 41 Lipari
- FP 42 Astrea
- FP 42 Venezia
- FP 43 Belize
- FP 44 Helia
- FP 44 Orana
- FP 45 Elba
- FP 46 Bahia
- FP 46 Casamance
- FP 48 Salina
- FP 50 Saba
- FP 56 Marquises
- FP 57 Sanya
- FP 58 Ipanema
- FP 60 Eleuthera
- FP Saona 47
- Fusion 40
- Gemini 105
- Gemini 3000
- Gemini 3200
- Gemini 3400
- Gemini Freestyle 37
- Gemini Freestyle 399 Power
- Gemini Legacy 35
- Grainger 420 Mystery Cove
- Gunboat 55
- Hirondelle 7M
- HopYacht 30
- Island Packet
- Island Packet Cat 35
- Kennex 420
- Knysna 440
- Knysna 480
- Knysna 500
- Knysna 550
- Lagoon 35
- Lagoon 37 TPI
- Lagoon 380
- Lagoon 39
- Lagoon 40
- Lagoon 400
- Lagoon 410
- Lagoon 42
- Lagoon 42 TPI
- Lagoon 420
- Lagoon 421
- Lagoon 43 PC
- Lagoon 44 Power Cat
- Lagoon 440
- Lagoon 450
- Lagoon 46
- Lagoon 470
- Lagoon 50
- Lagoon 500
- Lagoon 52F
- Lagoon 55
- Lagoon 560
- Lagoon 570
- Lagoon 620
- Lagoon Seventy 8
- Lagoon Sixty 7
- Leeuwin 42
- Leopard 38
- Leopard 39
- Leopard 39 PowerCat
- Leopard 40
- Leopard 42
- Leopard 43
- Leopard 44
- Leopard 45
- Leopard 45 Classic
- Leopard 46
- Leopard 46 Lion PowerCat
- Leopard 47
- Leopard 47 PowerCat
- Leopard 48
- Leopard 50
- Leopard 51 PowerCat
- Leopard 53 PowerCat
- Leopard 58
- Lidgard 73 Executive
- Looping 50
- Maine Cat 30
- Maine Cat 38
- Maine Cat 41
- Manta 40
- Manta 42
- Matrix 450 Vision
- Matrix 760 Silhouette
- Maverick 400
- Maverick 420
- Maverick 440
- Moxie 61
- Nautitech 40
- Nautitech 40 Open
- Nautitech 44 Open
- Nautitech 442
- Nautitech 46 Open
- Nautitech 47
- Nautitech 47 Power
- Nautitech 475
- Nautitech 65
- Neel 45
- Neel 47
- Outremer 40
- Outremer 45
- Outremer 50 Standard
- Outremer 55
- Outremer 5X
- PDQ 32
- PDQ 36
- PDQ 42 Antares
- Privilege 37
- Privilege 39
- Privilege 42
- Privilege 43
- Privilege 435
- Privilege 45
- Privilege 465
- Privilege 48 Transcat
- Privilege 482
- Privilege 495
- Privilege 510
- Privilege 65
- Privilege Serie 5
- Prout 31 Quest
- Prout 33 Quest
- Prout 34 Event
- Prout 35 Snowgoose
- Prout 37 Snowgoose
- Prout 37 Snowgoose Elite
- Prout 38
- Prout 38 Manta
- Prout 39 Escale
- Prout 45
- Prout 46
- Royal Cape 45
- Royal Cape 500 Majestic
- Royal Cape 530 Majestic
- Sailcraft 30 Iroquois
- Sailcraft 32 Comanche
- Sailcraft 35 Cherokee
- Sailcraft 41 Apache
- Sailcraft 44 Apache
- Scape 39
- Wildcat 350
- Seacart 30
- Seawind 1000
- Seawind 1160
- Seawind 1190
- Seawind 1200
- Seawind 1260
- Seawind 1600
- Simpson 48
- Solaris 36 Sunrise
- Solaris 36 Sunstar
- Solaris 42
- St Francis 44
- St Francis 48
- St Francis 50
- Stealth 11.8
- Sunreef 60
- Sunreef 62
- Sunreef 70
- Sunreef 74C
- Sunreef 82 DD
- Sunreef 88 DD
- Switch 51
- Switch 55
- TRT 1200
- Heavenly Twins 26
- Ocean Twins 38
- Vaan R5
- Vision 444
- Voyage 380 Maxim
- Voyage 400 Norseman
- Voyage 430 Norseman
- Voyage 440
- Voyage 450 Cabriolet
- Voyage 47 Mayotte
- Voyage 480
- Voyage 500
- Voyage 580
- Voyage 590
- Kronos 45
- Wharram 38 Tiki
- AMI 320 Renaissance
- Woods 22 Wizard
- Woods 35 Banshee
- Woods 35 Flica
- Woods 36 Scylla
- Woods 36 Vardo
- Woods 38 Transit
- Woods 40 Meander
- Xquisite X5
- Xquisite X5+
Catamaran Hull Design
- Post author By Rick
- Post date June 29, 2010
- 2 Comments on Catamaran Hull Design
Part 1: Notes from Richard Woods
Since the America’s Cup experimented with going multihull, there’s been a lot of interest in catamaran performance and the catamaran hull designs that define performance. Many guys are investigating whether to buy a catamaran or design and build their dream boat. Let it be said here that building a large catamaran is not for the faint of heart. People begin building 100s of boats a year, yet few are ever completed, as life always seems to have a way of interfering with a good boat build.
Never the less, since the rest of this website is about selecting and buying a boat , it only seems fair to have at least one webpage that covers catamaran design. This page contains notes on boat hull design goals and an accompanying page from Terho Halme has mathematical formulas used in actual catamaran hull design. It has become a popular research stop and an important reference to the catamaran design community.
The content of this page was reproduced from the maestro of Catamaran designs, renown British naval architect, Richard Woods, who not only designs catamarans, he sails them across oceans…. repeatedly. He has a lot to say on the subject of catamaran hull design.
“…When it’ all said and done, the performance of a sailing catamaran is dependent on three primary specs: length, sail area and weight. If the boat is longer it generally means it’ a faster boat. If she has more sail area, it means she’ a faster boat and if she’ light it means she’ a faster boat. Of course, there are limits: Too much sail area capsizes the boat in brisk winds. If the boat is designed too light, she will not take any kind of punishment. Too slim a hull design and the boat becomes a large Hobie Cat capable of only carrying your lunch. Of course, too long and large and you’d have to be Bill Gates to afford one. Then there are lot of additional and very important factors like underwater hull shape, aspect ratios of boards and sails, wet deck clearance, rotating or fixed rigging and so on….” Richard Woods
All Catamarans are not equal, but all sailboats have two things in common: They travel on water and they’re wind powered, so the Catamaran design equations in the 2nd part should apply to every catamaran from a heavy cruising Cat to a true ocean racer.
Richard Wood’s comments on catamaran design:
We all know that multihulls can be made faster by making them longer or lighter or by adding more sail. Those factors are the most important and why they are used as the basis of most rating rules. However using just those figures is a bit like determining a cars performance just by its hp and curbside weight. It would also imply that a Tornado would sail as fast forwards as backwards (OK, I know I just wrote that a Catalac went faster backwards than forwards)
So what next?? Weight and length can be combined into the Slenderness Ratio (SLR). But since most multihulls have similar Depth/WL beam ratios you can pretty much say the SLR equates to the LWL/BWL ratio. Typically this will be 8-10:1 for a slow cruising catamaran (or the main hull of most trimarans), 12-14:1 for a performance cruiser and 20:1 for an extreme racer.
So by and large faster boats have finer hulls. But the wetted surface area (WSA) increases proportionately as fineness increases (for a given displacement the half orange shape gives the least WSA) so fine hulls tend to be slower in low wind speeds.
The most important catamaran design hull shape factor, is the Prismatic Coefficient (Cp). This is a measure of the fullness of the ends of the hull. Instinctively you might think that fine ends would be faster as they would “cut through the water better”. But in fact you want a high Cp for high speeds. However everything is interrelated. If you have fine hulls you can use a lower Cp. Most monohulls have a Cp of 0.55- 0.57. And that is about right for displacement speeds.
However the key to Catamaran design is you need a higher Cp if you want to sail fast. So a multihull should be at least 0.61 and a heavy displacement multihull a bit higher still. It is difficult to get much over 0.67 without a very distorted hull shape or one with excessive WSA. So all multihulls should have a Cp between 0.61 and 0.65. None of this is very special or new. It has been well known by naval architects for at least 50 years.
There are various ways of achieving a high Cp. You could fit bulb bows (as Lock Crowther did). Note this bow is a bit different from those seen on ships (which work at very specific hull speeds – which are very low for their LOA). But one problem with them is that these tend to slam in a seaway.
Another way is to have a very wide planing aft section. But that can increase WSA and leads to other problems I’ll mention in a minute. Finally you can flatten out the hull rocker (the keel shape seen from the side) and add a bustle aft. That is the approach I use, in part because that adds displacement aft, just where it is most needed.
I agree that a high Cp increases drag at low speeds. But at speeds over hull speed drag decreases dramatically on a high Cp boat relative to one with a low Cp. With the correct Cp drag can be reduced by over 10%. In other words you will go 10% faster (and that is a lot!) in the same wind and with the same sails as a boat with a unfavorable Cp. In light winds it is easy to overcome the extra drag because you have lots of stability and so can fly extra light weather sails.
The time you really need a high Cp boat is when beating to windward in a big sea. Then you don’t have the stability and really want to get to your destination fast. At least I do, I don’t mind slowly drifting along in a calm. But I hate “windward bashing”
But when you sail to windward the boat pitches. The sea isn’t like a test tank or a computer program. And here I agree with Evan. Immersed transoms will slow you down (that is why I use a narrower transom than most designers).
I also agree with Evan (and why not, he knows more about Volvo 60 design than nearly anyone else on the planet) in that I don’t think you should compare a catamaran hull to a monohull, even a racing one. Why chose a Volvo 60/Vendee boat with an immersed transom? Why not chose a 60ft Americas Cup boat with a narrow out of the water transom??
To be honest I haven’t use Michelet so cannot really comment. But I have tested model catamarans in a big test tank and I know how inaccurate tank test results can be. I cannot believe that a computer program will be better.
It would be easy to prove one way or the other though. A catamaran hull is much like a frigate hull (similar SLR, L/B ratios and Froude numbers) and there is plenty of data available for those. There is also a lot of data for the round bilge narrow non planing motorboats popular in the 1930’-50’s which again are similar to a single multihull hull.
One of the key findings I discovered with my tank test work was just how great the drag was due to wave interference between the hulls. Even a catamaran with a modern wide hull spacing had a drag increase of up to 20 % when compared to hulls at infinite spacing. One reason why just flying a hull is fast (the Cp increases when you do as well, which also helps). So you cannot just double the drag of a single hull and expect to get accurate results. And any speed prediction formula must include a windage factor if it is to give meaningful results.About 25 years ago we sailed two identical 24ft Striders next to each other. They were the same speed. Then we moved the crew of one boat to the bow. That boat IMMEDIATELY went ½ knot faster. That is why I now arrange the deck layout of my racing boats so that the crew can stay in front of the mast at all times, even when tacking or using the spinnaker.
I once raced against a bridge deck cabin catamaran whose skipper kept the 5 crew on the forward netting beam the whole race. He won.
Richard Woods of Woods Designs www.sailingcatamarans.com
- Tags Buying Advice , Catamaran Designers
Owner of a Catalac 8M and Catamaransite webmaster.
2 replies on “Catamaran Hull Design”
I totally agree with what you say. But Uli only talk sailing catamarans.
If only solar power. You need the very best. As limited watts. Hp.
The closer to 1-20 the better.
Closing the hulls to fit in cheaper marina berth. ?
You say not too close. But is that for sailing only.
Any comment is greatly appreciated
Kind regards Jeppe
Superb article
Leave a Reply Cancel reply
Your email address will not be published. Required fields are marked *
Save my name, email, and website in this browser for the next time I comment.
- Expedition Yachts
- Expedition Catamarans
- Bering Marine
Bering Fleet
Visit our Popular Forums
- Monohull Sailboats
- Multihull Sailboats
- Powered Boats
- General Sailing
- Antares Yachts
- Fountaine Pajot
- Lagoon Catamarans
Cruising Business
- Boat Classifieds
- General Classifieds
- Crew Positions
- Commercial Posts
- Vendor Spotlight
Life Aboard a Boat
- Provisioning: Food & Drink
- Families, Kids, & Pets Afloat
- Recreation, Entertainment, & Fun
- Boat Ownership & Making a Living
- Liveaboard's Forum
Seamanship, Navigation & Boat Handling
- Seamanship & Boat Handling
- Training, Licensing, & Certification
- Health, Safety, & Related Gear
- Rules of the Road, Regulations, & Red Tape
Engineering & Systems
- Const. / Maint. / Refit
- Product / Service Reviews
- Electronics: Comms / AV
- Electrical: Batts / Gen / Solar
- Lithium Power Systems
- Engines & Propulsion
- Propellers & Drive Systems
- Plumbing / Fixtures
- Deck Hdw: Rigging / Sails
- Aux. Equipment & Dinghy
- Anchoring & Mooring
Photo Categories
- Member Galleries
- Life Onboard
- Sailing in the Wind
- Power Boats
- Cruising Destinations
- Maint. & Boat Building
- Marine Life
- Scuba Diving & Divers
- General Photos
Recent Photos
Listing Categories
- African Cats
- view more »
- Crew Wanted
- Crew Available
- Enhance Your Account
- Meet the Mods
- Meet the Advisors
- Signup for The Daily Cruiser Email
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
IMAGES
VIDEO
COMMENTS
THE ULTIMATE EXPRESSION OF PERSONAL INDEPENDENCE. Introducing Metal Shark Yachts. These highly advanced, industrial-grade oceangoing vessels defy convention while enabling a new level of worry-free exploration and adventure. Our all-aluminum, American-made catamarans offer global range and deliver self-sustaining independence for months on end ...
Bering Yachts makes steel hull expedition type trawler yachts under 24 meters, fast hydrofoil catamarans, which are Affordable superyachts, safe, comfortable and rangy. Models. ... Bering catamarans have combined the best of two worlds: stability of the cat design and luxury, quality of craftsmanship, and innovations Bering is known for. ...
Safety and stability, practicality and craftsmanship, capability and innovation - this is a Bering boat, and we plan to make it the best multihull available. BC60 is 18.9 meters long, has a 8.6-meter beam and displaces 62.8 tons at full load. The gross tonnage of the basic model with an open flybridge is 109.7 GT.
Find Steel boats for sale in your area & across the world on YachtWorld. Offering the best selection of boats to choose from. ... hull-steel. Steel. hull-wood. Wood. 1,342 boats. Sort By: Recommended. sort-by. Recommended. sort-by. Listing Date: New to Old. ... 2025 Mansion Yachts catamaran. US$4,000,000. Engel Volkers Yachting Americas ...
With a focus on safety, comfort, impeccable style and long range, Bering Yachts redefines yachting possibilities. Our expansive fleet caters to every desire, from the elegant 65-foot explorer to the luxurious 265-foot expedition Yachts. Each Bering Yacht seamlessly blends innovation and comfort, empowering you to conquer any ocean.
2002 PDQ Power Catamaran MV/34 Passagemaker. US$199,750. Bluewater Yacht Sales, LLC- Annapolis Office | Edgewater, Maryland.
Among the many advantages of Metal Shark's high-efficiency Incat Crowther catamaran hull design, M48 delivers nearly twice the range of a comparably sized traditional monohull yacht. At a long-range speed of 10 knots, M48 boasts an unbelievable 11,000 nautical mile range. At a 17-knot cruise speed, M48 delivers an impressive 4,500 nautical ...
Catamaran is a yacht brand that currently has 40 yachts for sale on YachtWorld, including 14 new vessels and 26 used yachts, listed by experienced boat and yacht brokers mainly in the following countries: United States, Spain, France, French Polynesia and South Africa. The selection of models featured on YachtWorld spans a spectrum of sizes and ...
Straw was added to bricks centuries ago, and steel reinforced concrete is a staple of construction over the last century. For boats, it's the use of stranded fibers and cured resins which make FRP different. ... The lightest, most expensive hulls are made from carbon, but a catamaran builder may use carbon in places other than the hull to add ...
The best power catamarans ride smoother than comparable monohulls, enjoy an efficiency edge, and also benefit from enhanced stability. But that's just the best ones — there are also plenty of powercats out there which fall short in one way or another. And while each and every boat on the water differs, the safest way to know you're buying one of the best is to choose one built by a top ...
BB260 "Steel Catamaran 9 Metre" $595.00 Length 9.0 m Displacement 6500-7500 kg Material Steel Hull Draft 0.85 m LWL 7.9 m Hull Weight 4500 kg steel Beam 3.8 m ... Steel hulls, with a good coating system, can hold up very well, and if that is your preference, then proceed to get what you want.
If you have fine hulls you can use a lower Cp. Most monohulls have a Cp of 0.55- 0.57. And that is about right for displacement speeds. However the key to Catamaran design is you need a higher Cp if you want to sail fast. So a multihull should be at least 0.61 and a heavy displacement multihull a bit higher still.
Yachts with Catamaran Hulls of Steel. There are currently over 10,800 yachts afloat. The longest yacht in the world is Azzam, measuring 180.61m (592'7').She was built in 2013 by Lürssen.The largest yacht in the world is Fulk Al Salamah, built by Mariotti in 2016, with a volume of 20,361 GT. On average, yachts are 36m long with a volume of 341 GT.
Bering Yachts makes steel hull expedition trawler yachts under 24 meters, fast hydrofoil catamarans, which are Affordable superyachts, safe, comfortable boats from 2007. Models. ... Hull No.2. In build. Bering 88. Hull No.1. In build. Bering 82. In build. Bering 80. Hull No.2. In build. Bering 80.
Find Trawler Steel boats for sale in your area & across the world on YachtWorld. Offering the best selection of boats to choose from. ... hull-steel. Steel. hull-wood. Wood. 131 boats. Sort By: Recommended. sort-by. Recommended. sort-by. Listing Date: New to Old. ... Catamaran Guru | Tracys Landing, Maryland. Request Info; 2016 Custom Trawler ...
steel catamaran. Yes, a couple stopped at my marina a few years ago with their home built steel cat. ... Her core hull was constructed with aluminium. The sailing yacht superstructure is fabricated predominantly with aluminium. With a beam of 13.41 metres / 44 ft CUAN LAW has beamy size. She has a fairly shallow draught of 1.65m (5.4ft).
The catamaran remains afloat even with two damaged floats. In winter, the steel housing freezes in the ice, so there is no need to pull it ashore. The walls of the house are built of 10-layer composite sandwich «with» heat and noise insulation, on heat conductivity identical brick wall thickness of 3.5 m.
Shrouds are galvanized or steel cables of the dead ropes of a sail catamaran. They fix the mast in a vertical position. A mainsail is the back part of a sail playing the key role in its structure. Its settings influence the running if the sail catamaran in different weather conditions.
Listed hull types include catamaran, monohull, trimaran, deep vee and other. Built by a wide variety of yacht building companies, YachtWorld presently offers a selection of 1,974 catamaran yachts for sale. Among them, 492 are newly built vessels available for purchase, while the remaining 1,482 comprise used and custom yachts listed for sale.
Curvelle Multi-Hull QUARANTA yacht charter. A multi award-winning power catamaran, QUARANTA is 34.1m (111ft) and hailed as the largest carbon hybrid superyacht catamaran for charter in the world. This 34m superyacht catamaran has as much interior and exterior volume as other performance monohulls in the 40 - 42m range.
2005 Conrad 88. US$4,500,000. HMY Yacht Sales, Inc. | West Palm Beach, Florida. Request Info. <. Find Steel boats for sale in United States. Offering the best selection of boats to choose from.
Custom. Custom is a yacht builder that currently has 1,323 yachts for sale on YachtWorld, including 259 new vessels and 1,064 used yachts, listed by experienced yacht brokers and boat dealerships mainly in the following countries: United States, Italy, Turkey, Canada and France. YachtWorld offers a diverse array of models, showcasing a ...