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A Case for Displacement Power Catamarans
Article by Malcolm Tennant as published in Multihulls Magazine
In our Premier Issue, Malcolm Tennant, one of today’s foremost power catamaran designers, discusses the principles of planing vs. displacement catamarans. In this article he makes clear his choice of the displacement cat.
For some fifteen years now our office has been designing powerboats that combine something of the old and something of the very new. To make a leap forward in comfort and economy we looked back to the close of the 19th Century and the early years of the 20th. We have taken the powerboat wisdom of that time and used it in the designing of very modern power catamarans that can have much more living space than their monohull cousins, and that easily surpass them in comfort and economy. Current thinking has it that to go fast in smaller craft it is necessary to plane. This is because the usual monohull displacement craft are restricted to a speed of approximately 1.34 times the square root of their waterline length (Froudes Law).
To drive a normal displacement vessel faster than this requires an inordinate amount of horsepower and may even lead to foundering in their own bow and stern waves, or by rolling the gunwales under from the enormous torque produced. Planing is a way to circumventing Froudes Law by getting the vessel to plane on top of the water where the wave making drag is no longer a restriction on their performance. However, planing craft do need to be relatively light, i.e.: have good power-to-weight ratios, and planing surface-area-to-weight ratios; are very inefficient when they are not planing, and are not as economical to run at some speeds as the displacement craft.
So we seem to have two distinct type of boats: a. One that is fast, but uneconomical at slower speeds and can have a bone-jarring ride in a seaway; b. The other, that is economical and comfortable in a seaway, but is slow. Is it then even possible to get a craft that combines the best features of both these types? A boat that has reasonable, even good performance with excellent accommodations and is still economical to build and run and has good seakeeping capabilities: or is this just one of those designers’ pipe dreams?
One quite successful attempt to achieve this dream was made by Tom Fexas with his Midnight Lace series of monohull designs, in which he used long, light, semi-displacement hulls to improve economy without compromising performance too much. These boats were, in fact, a compromise (aren’t all boats?) and, to me, only partially successful by reason of his definition of a slim hull which was, of course, forced on him by the need for stability, accommodation and sea keeping. To Tom Fexas a slim hull was one that had a length-to-beam ratio of four (the waterline length was four times the waterline beam). This was certainly narrow by contemporary planing boat standards, but was unexceptional when compared with earlier boats, or with types of hulls that I am proposing should be used.
Before the improvement of the power-to-weight ratio of the internal combustion engine, and the development of the hard-chine, low-deadrise hull that allowed boats to plane, there was only one way to go fast: building long-and-slim, and in the first decade of the 20th Century we find boats such as Slim Jim, that were achieving speeds of 15 knots from a 15 HP engine driving just such long hulls in 1905. Typical of the early boats was Defender: 16.2m (53′) long, having a maximum hull beam of 2.28m (7’6″). Headroom under the flush deck was only 1.45m (4’9″) and she slept six in berths only 500 mm (18″) wide. In anything of a seaway it would have been incredibly wet and uncomfortable.
The boat had a great deal of grace and elegance to her lines, but her rolling at sea, and lack of accommodations, would be totally unacceptable today except for one small detail: a 48 HP motor propelled this 16.2m boat at 16.5 knots! Is it possible, then, to reconcile these old, easily driven, but incredibly uncomfortable hull forms with the current, ever increasing demands for more interior space and more home comforts that can be the downfall of many a well-designed planing craft? I believe the answer is: catamarans! By joining two of these long, slim hulls together and surmounting them with an extensive superstructure, we are able to provide even more than the currently desirable amount of accommodation and at the same time stabilize the hulls so that rolling is no longer a problem.
So it would seem that all we have to do is to make power catamarans with long, slim hulls, and then we will have speed, economy and accommodation. The potential is there, but is it really that simple? The answer, of course, is “no” not quite!
Even a very cursory look at sailing catamarans will show that they are not restricted by Froudes Law. Their very fine hulls place them on a very different part of Froudes’ wave making continuum, and results in their having a very much higher hull speed than he ever envisioned from his observations in the order of 30+ knots is not unusual for these boats. Certainly the boats with this sort of performance are very lightly loaded racing craft, but even the more heavily laden cruising boats do not have much trouble breaking the 1.34 barrier. If these sorts of speeds can be achieved under sail, than it should be much easier under power.
Towing tank tests of long, slim hulls with high prismatic coefficients (fine hulls with a fairly even spread of displacement from bow to stern), such as our displacement powerboats exhibit, have shown no catastrophic increase in wave drag at speed/length ratios above approximately 1.4 such as occurs with “normal” displacement hulls. These high prismatic hulls have a higher displacement hull speed than is “normal.” This test data is further supported by the precisely measured performance tests of such boats as the Zenith-47 Antaeus, the Awesome 2000, the Mako-61, the Jaybee and the Icarus 46 in the full-sized ocean test tank. All these boats have prismatic coefficients greater than 0.66 and all easily exceed their theoretical hull speeds, while returning exceptional fuel economy.
So it would seem that all we have to do is to make power catamarans with long, slim hulls, and then we will have speed, economy and accommodation. The potential is there, but is it really that simple? The answer, of course, is “no” not quite! If we compare a sailing catamaran with a keelboat, we will see that the catamaran has one immediately obvious advantage. It is lighter because it is able to eliminate the lead keel upon which the keelboat depends on for its stability. In the case of the powerboat, there is no such advantage. The catamaran may, in fact, be heavier than the monohull because of its increased area. All is not lost, however, because while the skin area is increasing by the square, the interior volume is increasing by the cube! This possible increase in weight may be a problem with planing catamarans because of their limited planing surface, but it does not mean that our dream is impossible.
The displacement catamaran is not as susceptible to overloading as is the planing craft. The hull speed of the displacement boat is largely dependent on the L:B ratio of the hulls and this does not change very much with modest overloading. This does, however, bring up one of the limitations of the displacement boat. To work successfully, the L:B ratio of the hulls should be in excess of 10, and preferably higher. Consequently, if high displacements and length restrictions force short, fat hulls on the designer, then the displacement approach will not be successful. In this situation the only recourse is to lengthen the hull until the requisite L:B ratio is obtained, or to use a planing hull form.
It will be apparent from this, that the displacement concept would seem to have little place in boats shorter than 10m (32′), unless they can be built light or a very modest performance is required. I have designed smaller displacement boats that achieve quite credible 15-knot cruising speeds from very small horsepower (43 HP per side) engines. But if performance on par with planing vessels is required, then the displacement boat must be able to have long, slim hulls, preferably without the planing boats’ low deadrise, submerged chine sections, as this increases the drag substantially, and even more if the chines break the surface. This, then, is the approach we have taken with a lot of our power catamaran designs: long, slim, easily driven round-bilge, minimum wetted surface hulls that give performance on a par with planing craft, but with considerably better sea-keeping capability and better fuel economy.
It is, of course, possible to question whether these boats really are displacement craft. Current theory says that for vessels of this length, to go this fast, they must be planing. In fact, if we accept the usual definition of planing vessel, namely: that it has a speed/length ratio of more than 2, then these boats are clearly planing. However, a boat is said to be planing when most of its mass is supported dynamically by the downward directed thrust of the water. A vessel that is planing will typically have a bow out trim and will have bodily risen out of the water. The waters are muddied a little by the fact that there is no sudden jump from displacement to planing. It is a continuum and somewhere in the speed/length ratio range from 1.5 to 2 the craft would be considered to be in a “semi-displacement” mode. We have now designed a large number of displacement power cats exemplifying the “long and slim” approach of powerboat design.
The Zenith-47 displaces 13 tons fully loaded, and motors at 20 knots maximum much more economically at 16 knots with only two 122 kw (160 HP) pushing hulls with a 24.5 knot hull speed. A monohulled displacement boat of this length would have a hull speed of about 8.5 knots. The smaller Nomad and Cortez powerboats also have a similar hull speed but are optimized more for economy with slower speeds with small engines. The Icarus-46 has a top speed of 25 knots from two 150 kw (200 HP) turbo-charged diesels. At the upper end of the scale is the Mako-61, an 18.6m (61′) game fishing boat with a hull speed of 37.5 knots which would yield an easy 30 knots with around 500 HP per side. In the interest of economy, this boat is intended to cruise at 16 knots with a maximum of 20 knots using twin 150 kw
These performances are very much faster than those of the traditional displacement boats of comparable size and are on a par with that of a planing boat of similar displacement, but with lesser power requirement and subsequently greater economy. I believe the performance of these designs demonstrates the potential of the displacement power catamaran to be that very elusive and ephemeral animal; the best of all possible worlds: combining excellent accommodation, comfort, and economical performance with good old-fashioned seaworthiness. It seems to me that there is no reason why this old “long and slim” principle should not be applied to lightweight boats with less superstructure and even finer hulls, to produce 30 or even perhaps 40 knots of fuss-free performance from quite modest horsepower.
In fact, this belief has been partially tested with two offshore designs: the 17.5m (57′) Red Diamond II, designed for a Japanese client, capable of a top speed of 33 knots (cruising at 24) from twin 320 kw (430 HP) Yanmar diesels; and the 20m (65′) Awesome 2000, which has a top speed of 28 knots, and an open ocean cruising range of 3,000 miles at 15-knot speed. This craft has made the trip from Long Beach, California to Hawaii using only her internal tanks. Although these displacement cats may not be the fastest things around in flat water, they have demonstrated an ability to maintain much higher average speeds than most other craft regardless of sea conditions. In situations where the high-speed planing monohull is forced to drastically reduce its speed, the displacement catamaran is able to continue on with very little reduction in performance.
This ability is displayed day in and day out by the rapidly expanding commercial catamaran ferry fleets whose operators recognized the economic advantages of this concept early on. It has often been pointed out that many people with displacement boats try to push them too fast and, consequently, would be better off with a planing boat. For these people there is now another alternative: displacement boats with the performance of planing craft and the frugal thirst and smooth comfort of the traditional displacement boat.
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Leopard 53 Powercat
The ultimate power catamaran that surpasses all others. Built by Robertson & Caine and designed by naval architects Simonis Voogd, the Leopard 53 Powercat marries comfort, performance and ease of handling, delivering an unparalleled blue water cruising experience. This 4th generation vessel features all the attributes that made its predecessors successful, while reimagining what a powercat should be. Here, there is no compromise; the Leopard 53 expertly combines luxury with the rugged and adventurous spirit for which the brand is known. The result is unprecedented space, stability, and efficiency with every creature comfort one would expect from a luxury motor yacht. Outdoor entertaining space is paramount, and the Leopard 53 has been expertly designed to anticipate every need of the passenger. Spacious seating large enough to accommodate everyone surrounds a large table, creating the perfect environment to convene and recount the day’s adventures, enjoy a meal with spectacular views, or just sit back and take in the salt air. Intuitive design throughout means improved functionality and efficiency, including the flybridge and helm station with maximized visibility. All coach roof windows are flat toughened glass for optical clarity. Smart, ergonomic design and the latest technology work harmoniously to create ease of operation and maintenance for a seamless onboard experience. Inside, a modern interior with a cool palette immediately sets the tone for at-sea living. The saloon features an L-shaped lounge and a two-person settee with an option to add an interior navigation station. The hull side window, with the option of different portlight configurations, as well as the coach roof windows and panoramic windows in the saloon, bring in an abundance of natural light. At night, smart lighting casts warm, consistent light throughout the space. It’s easy to move about with access to the foredeck through the forward saloon door. The galley, a natural gathering spot, offers ample storage and is outfitted with Staron® worktop surfaces and a full suite of appliances making meal preparations easy and enjoyable. The Leopard 53 Powercat reimagines comfort through its optimal use of space and attention to detail, evident in every aspect of the design. Available in three- or four-cabin layouts with the option for separate crew cabins, private quarters include ensuite heads with their own shower area. The three-cabin owner’s version provides an at-home feel with a large island bed, a walk-in closet and a double vanity. A separate engine room that houses all major systems is completely sealed off from the living space, substantially reducing engine noise and odors. The Leopard 53 Powercat brings freedom and exhilaration to cruising in a way no other powercat can. Sit back, relax and enjoy cruising on your own terms.
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- LOA: 53 ft 1 in / 16.19 m
- Beam: 25 ft 2 in / 7.67 m
- Draft: 3 ft 3 in / 1 m
- Bridgedeck Clearance: 2 ft 7 in / 0.79 m
- Max height above W.L. (excl. antenna stalks): 18 ft 6 in / 5.65 m
- Engine: Yanmar 370HP x 2
- Maximum Speed (in light ship conditions): 24 Knots
- Cruising Speed (in light ship conditions): 17 Knots
- Maximum Range Speed (in full load condition): 7.9 Knots
- Maximum Range Speed (with one engine in full load condition): 6.8 Knots
- Range at Max Speed: 342 Nm
- Range at Cruising Speed: 463 Nm
- Maximum Range with Both Engines: 1330 Nm
- Maximum Range with One Engine (in full load condition): 1995 Nm
- Engine No. Cylinders: 8
- Consumption Curves: View Leopard 53 Powercat Performance Curves
- Fuel: 562 gal / 2130 L
EXTRA DETAILS
- Water: 185 gal / 700 L
- Displacement: 47203 lbs / 21411 kg
- Load Carrying Capacity: 13490 lbs / 6119 kg
- Holding Tank Capacity: 42 US Gal gal / 160 L
All Leopard Catamarans are NMMA and CE Certified. Speed and range figures can vary depending on measurement conditions and fuel quality. All specifications are to be confirmed by customer prior to purchasing.
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70 Luxury Power Catamaran
Gorgeous lines, super balanced, intelligent luxury. These are just a few ways to describe our new flagship, the Aquila 70 Luxury Power Catamaran. This breathtaking and powerful catamaran is like nothing you have ever stepped aboard. With an aesthetically pleasing design at every angle, the Aquila 70 looks like the stunning luxury yacht that it is.
The Aquila 70 can top out at 27 knots (with the optional engines) yet still cover long ranges at slower speeds. Power and maneuverability come from Volvo Penta inboards coupled with joystick control. Carbon fiber reinforcements keep weight down while adding to the yacht’s strength. The high bridge-deck clearance allows for even more comfort underway and improved speeds.
For your relaxation and entertainment needs, the Aquila 70 has massive spaces designed with European flair that are bright, inviting, and welcoming including a 27’ wide master suite. Versatile interior layouts, along with rich wood finishes, soft fabrics, smart appliances, designer furnishings, incredible headroom, and panoramic windows make your experience onboard even better.
Outdoor areas receive just as much attention. Our signature stairs make it easy to access the foredeck from the flybridge, which can be fully open or enclosed with A/C and a wide Portuguese bridge for easy access from aft to bow. If you prefer, spend your time hanging out aft, with its comfortable plush seating, huge beach area, deep swim ladder and excellent dinghy launching.
The Aquila 70 is truly a crowning achievement.
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Aquila 70 Luxury: Make Your Dream Come True
Gorgeous lines, super balanced, intelligent luxury. These are just a few ways to describe our new flagship, the Aquila 70 Luxury Power Catamaran.
This breathtaking and powerful catamaran is like nothing you have ever stepped aboard. With an aesthetically pleasing design at every angle, the Aquila 70 looks like the stunning luxury yacht that it is
A Yacht Built for Exploring Your World
Gorgeous lines, super balanced, intelligent luxury. Introducing the Aquila 70 Luxury Power Catamaran.
Origins Revealed
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Aquila 70 Luxury Power Catamaran | Full In-Depth Walkthrough
Join us on a tour of the all-new Aquila 70 both inside and out. Gorgeous lines, super balanced, intelligent luxury.
Aquila 70 Luxury Power Catamaran Test Video - By BoatTEST.com
Get a full, in-depth Captain's report on the Aquila 70 Luxury, reviewing test data and performance.
Aquila 70 Luxury Features Video - By BoatTEST.com
A complete features inspection on this largest model by Aquila, who entered the luxury yacht segment with this flagship model.
Specifications
| Specs Category | Specs Dimensions |
|---|---|
| Length Overall | 21.26 M / 69' 9" |
| Beam | 8.20 M / 26' 11" |
| Waterline Length | 20.55 M / 67' 5" |
| Draft | 1.45 M / 4' 9" |
| Light Displacement | 47,000 KG / 103,617 LB |
| Loaded Displacement | 54,577 KG / 120,321 LB |
| Fuel Tank | 5,480 L / 1,447 GAL |
| Water Tank | 1,560 L / 412 GAL |
| Holding Tank | 560 L / 146 GAL |
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| With comfortable accommodation, fast cruising performance, low runing costs and a great look, this is the power boat that many have been waiting for. Introducing a coastal cruising boat that makes sense for our times. The Argus E35 is at home in the Australian coastal environment with a vast array of reef, island, estuary and river destinations to explore. At 10.2 metre waterline length, the displacement hull technology provides an extraordinary smooth ride. Even in the type of rough conditions like the infamous Moreton Bay chop a tunnel clearance of 0.7 metres means that most waves will simply pass under. The bow with narrow hulls and a deep forefoot rises slowly to the chop so the boat slices through the waves rather than bouncing over them. A large reserve buoyancy in the asymmetrical bow carries the boat over the bigger stuff. The occasional high standing wave is softened by the new wave breaker nacelle. This means that the boat can maintain a substantial cruising speed when caught out in nasty conditions. By increasing crew comfort and maintaining a higher cruise speed, the ability to weather the unexpected is an important safety feature. With a draft of only 0.6 metres shallow water access couldn't be easier. The catamaran hull ensures a level platform for drying out on sandy tidal flats. The sedan version has an above waterline clearance of 2.9 metres (plus radar mast) which means that the majority of canal and river bridges can be undertaken without waiting for low tide. The capability of exploring river systems dramatically expands waterway access and anchorage opportunities. The helm features an elevated seating arrangement for two that provides a commanding view. Two hatches are strategically placed overhead to allow a standing position on the helm seat for an even better perspective of the surrounding area. Huge workspaces either side of the helm are perfect for charts or a laptop. Electric opening outer glass screens provide good ventilation. A cruise speed range of 6 to 16 knots gives incredible flexibility in range and time to destination. At 8 knots the fuel consumption of 1 litre per nautical mile gives a range approaching 600 miles in favorable sea conditions. A direct run from the Gold Coast to Sydney (400 nautical miles) or even Brisbane to Mackay (500 nautical mile) is now possible on less than 600 litres of fuel. The boat cruises comfortably at 16 knots while returning a fuel consumption of around 1.5 litres per nautical mile. The range is about 400 miles at this speed. The data shown below was taken from the vessel #1 in calm conditions with no influence of current.
The optional inboard diesel version should return even better economy and range figures. The outstanding economy achieved by the design is evidenced by the minimum water disturbance. With less drag, a higher proportion of engine power goes into driving the boat forward rather than generating a huge wake. This means that lower horsepower engines can easily achieve the designed hull speed. The relatively small wake does little to disturb boats at anchor or smaller vessels under way. I's a vessel that pays respect to fellow boaters, the foreshore and the environment. The Argus E35 presents the unique combination of cruising ability for the voyage and outstanding comfort at anchor. The emphasis has been placed on live aboard comfort for fewer people rather than cramming additional sleeping cabins and heads. As an entertainment platform the E35 shines to host your friends and fellow cruisers. Two generous sleeping cabins feature queen size bedding, ample storage and flow through ventilation. A single head to starboard is spacious. The large galley has over two metres of bench space and is complete with induction electric cooktops, microwave oven and refrigerator. The saloon has a large, bright and airy feel. It will comfortably seat 8 people for a social get together and is extremely spacious for four. The aft deck is large with room for a table and chairs to seat 8 people or can easily handle up to six for fishing. The vessel is not short on headroom either with 2050 mm (6' 6") in the saloon and 1850 mm (6' 1") in the hulls. The on board systems are engineered to be quiet and hassle free. Just over 500 watts of solar panels on the roof provide the main electrical power for the vessel. In conjunction with energy efficient appliances (for example the refrigeration enclosures are fitted with thick Dow Corning foam) there is no need to run a generator. The hot water system is heated "for free" using waste heat from the refrigeration system. The standard electronics package includes a Raymarine autopilot, 12" colour chart plotter, radar, fish finder, NMEA-2000 instrumentation, AIS, VHF radio and electronic engine controls. Vessel electrics and systems are managed by a state of the art Empirbus computerised wiring and control system that helps turn operation of the vessel into an easy and fun experience for all. All of this means that the standard boat is engineered ready to go cruising in comfort right from the start with no hidden extras.
May 19th 2011 was the official release date of the Argus E35 at the Sanctuary Cove International Boat Show. Argus Boats thanks all of our visitors for their visit and feedback. Outback Marine released the first Argus E35 at the Sanctuary Cove International Boat Show. The vessel is based in Brisbane and is available for viewing. Production orders are now being accepted.
Tradaboat Boat Test Boatpoint Review Argus E35 Brochure Argus E35 Specification Roger Hill Yacht Designs Argus Boats® Pty Ltd © 2009, 2010, 2011 All specifications and features are subject to change without notice. The actual supplied vessel specification is determined by written contract. Any referred performance data is provided as a guideline and is not intended as a performance specification.  LEECH 1025 SEMI DISPLACEMENT POWER CAT The new Leech 1025 Semi Displacement Power Catamaran incorporates the latest thinking from designer Dan Leech. According to Leech, it is the culmination of ten years of design development and refinement of his semi-displacement power catamaran. Being built in Nelson for an Auckland client, the new design will offer an incredibly soft riding, fuel-efficient boat with excellent sea keeping. Built from full composites from a very high-quality construction using e glass/epoxy laminates on either side of a foam core, it is a solid but lightweight structure, which enhances the boat’s performance. Using the foam core also makes for a very quiet boat. Features include full standing headroom throughout, a queen-size berth forward, head and shower forward, quarter berths in the port and starboard hulls, a large galley in the saloon, and a large U-shaped settee with a table that can form a double berth.  The cockpit has a side door for easy access from the marina berth, a considerable aft boarding platform, fishing rod locker, huge under-floor storage and built-in seating. The aft cabin bulkhead has a large window that opens and a sliding door, so the saloon opens right up to the cockpit to give great indoor/outdoor flow. The hardtop roof extends aft over the cockpit for sun and rain protection.  Powered by twin Mercury 115hp 4 stroke outboards, an optional foil will be available for added performance. The lightweight structure, efficient hull design, and foil allow small engines to be used and low fuel consumption. The 10.25m power cat carries a beam of 3.80m. Dan Leech Naval Architecture | [email protected]  L&B TO DISTRIBUTE VERATRONFountaine pajot launch first my4.s, related articles, grand opening of horizon yacht usa west coast..., anura ‘steps up’ investment in local innovation, advance trident’s latest exciting news, vicem unveils the tuna masters 37 express, the new catalyst gt – very close to..., raymarine’s new collaboration with epropulsion, sandbrooks introduce retrofit frameless sliders, sealegs launch their latest craft, testing for excellence – volvo penta ips professional, lucky powerboat magazine subscriber wins prize. D&B Publishing is proud to have delivered the Pacific regions best power boat read for over 25 years. Our PowerBoat team brings you the news, views and reviews from around the world. A team second to none when it comes to power boating.
[email protected] Tag: prowler power catamaran design by sdiGrowler 710 vt.  The Growler 710 VT has been designed specifically for those interested in a fast, practical run-a-bout for fishing, over-nighting or sports, with three different versions available.CONTACT US FOR MORE INFOCurrent build - malta.  These cats have found huge favour locally and worldwide with special interest from France and New Caledonia. It is refreshing to see some people appreciating the ‘true’ multihull values of a proper A hard-top cover provides much needed shade when out on the water, as well as plenty of space to work while remaining extremely stable in even the largest swells. She has excellent load carrying capabilities, and can be loaded with equipment and passengers more so than other boats of similar size or perhaps just to bring home all the fish! The reduced size bimini reduces interference with rods and casting. Depending on your needs, a small 12v fridge could easily be fitted. This is a new take on the ‘bowrider’ style, with good looks, extraordinary speed and fantastic fuel economy.For more information please download our study plans on this design using the link below., growler 710 vt study plans, growler 710 vt fishing.  The Growler 710 VT Fishing has been designed specifically for those interested in a fast, practical run-a-bout for fishing. A hard-top cover provides much needed shade when out on the water, as well as plenty of space to work while remaining extremely stable in even the largest swells. She has excellent load carrying capabilities, and can be loaded with equipment and passengers more so than other boats of similar size. Or perhaps just to bring home all the fish! The reduced size bi-mini reduces interference with rods and casting. A small fridge can be installed, and theres plenty of rooms for eskies. Floor space is kept flat with one step forward to maximise the room when fighting a big catch. The Growler 710 VT Fishing is the ultimate fishing machine!Growler 710 vt sports.  The Growler 710 VT Sports is the ultimate run-about for waterskiing, wakeboarding, or simply taking out friends and family for a day on the water. With plenty of seating for 6 passengers, or more should you require – you won’t have to leave anyone at home. Perfect for loading the camping gear and taking off up rivers, creeks and inland waterways, as well as extremely seaworthy for those adventures that take you out into the ocean swells. Easily beached, just raise the outboards or anchor and swim from the transom. Depending on your needs, a small 12v fridge (and port-a-potty) could easily be fitted to keep the beer cold while lazing on the beach. This is a new take on the ‘bowrider’ style, with good looks, extraordinary speed and fantastic fuel economy.Growler 710 vt cuddy cabin.  The Growler 710 VT Cuddy is our third option for the ultra-efficient registered VT (Vapour Trail) hull shape used on the 6.5m platform. She boasts a surprisingly roomy cabin, with a double berth from which a table extends to create a dinette if required. A small fridge, small gas cook-top and port-a-potty can also be installed if desired. This little weekender is perfect for inland lakes or skipping out to the islands at a top speed or 45 knots (depending on engine choice). Exceptional ocean going ability is a key feature. The Cuddy can also be trailered and stored in the driveway during the week. Built from balsa-core Duflex panels, this tough little cat is perfect for those weekend trips with friends and family or a romantic retreat with a partner.Prowler 1500.  The Prowler 1500 is a semi-displacement power catamaran design, following a more traditional style in comparison to some of the more modern power designs such as the growler series. Prowler 1500 Study Plans - PDF Coming SoonThe bows have been kept quite square and sharp, and the cabin features large wrap around windows and angular styling. the foredeck runs forward to the front of the bridgedeck providing a wide spacious area for sunbathing, enjoying a glass of champagne or giving storage space for dinghy or other cruising toys., the layout is open plan and offers a surprising amount of interior space and accommodation due to the prowler’s wide hulls—significantly wider than that of her alaskan sisters. this extra width does allow a little more freedom when configuring the layout and combats the ‘stuffy' enclosed feeling that being down in the hull can bring., the prowler 1500 is a large displacement hulled cruiser that will sleep 4-86 family or friends comfortably. she has a very large light ‘n airy galley and saloon allowing full-size appliances. the cockpit is also designed for entertaining, cooking, toys, and fishing. the flybridge is generously laid out which could also covert into a premium berth. the upper deck also has wide possibilities for storage or entertaining., the prowler 1500 is a large displacement hulled cruiser that will sleep 4-6 family or friends comfortably..  Exterior CAD Renders Interior CAD Renders Prowler 40 Open Cruiser Prowler 40 Open/CruiserSdi prowler 40 open/cruiser is a commercial power catamaran, available at a very competitive price for a motor-away vessel, the open layout is ideal for dive-boats, day-boats, snorkelling tours and almost any other on-water charter..  No matter where you need to go, or who you're taking, the Prowler Open 40 can get you there quickly and in comfort. The Cruiser version has accommodation and relaxing living areas for the whole family.This pictured version is an open plan bridgedeck, featuring ample seating for the 32 passengers that she can safely and comfortably carry, along with an additional 3 crew members. the hulls have 1.85 metres of headroom and provide toilet amenities, crew bunks and a galley for food preparation., if you're looking for a fast good-looking commercial vessel that will perform well above expectations and is more affordable than you think - look no further, for more information please contact us regarding study plans., prowler 40 open/cruiser.  Prowler 33 Cruiser The Prowler 33 Cruiser is a commercial or pleasure power catamaran offered by Multihulls PCM, located in Slovenia.Available at a very competitive price for a motor-away vessel and in a number of alternate configurations. PCM 330 has semi-displacement hulls that makes her very efficient at most speeds. It means small engines and economical fuel consumption! This production vessel als has 2 Double Cabins forward + 1 Cabin in the starboard aft + 1 big Bathroom (2.5m long) with 2 separate washbasins with hot/cold pressure water and shower in the port aft. Inside this bathroom there is a door that brings you to a separate Head with its own washbasin with hot/cold pressure water.Galley is up on the bridge deck together with the spacious saloon. there is a wooden table and bench seating for 6 people which is convertible to a double bed as well in the saloon. panoramic view through non-opening windows all around is one of her features. the generous cockpit allows boarding through doors on either side and has seating for 8 people together with two handcrafted wooden cockpit tables., if you're looking for a fast good-looking pleasure or dive vessel that will perform well above expectations and is more affordable than you think - look no further, see the full prowler 33 page on the multihulls pcm website here., prowler 33 cruiser.  Prowler 1360 The Prowler 1360 is a semi-displacement power catamaran design, following a more traditional style in comparison to some of the more modern power designs such as the Growler Series. The Prowler 1360 is a large displacement hulled cruiser that will sleep 4-6 family or friends comfortably.Prowler 1360 study plans - pdf.  Prowler 1040 GTR The Prowler 1040 GTR looks quite like the Growler VTR, both sharing the new ‘Schionning’ sleek, stealth styling above water but the underwater shape is quite different. The Prowler GTR has a standard semi-displacement hull shape. This is a very efficient hull that travels through the water so doesn’t plane or achieve the very high speeds of the Growler but she is however more economical for longer distance travel and she’ll cruise comfortably and efficiently from 0-22kts.The hull is rounded so construction uses strip planking for the hull bottoms but the rest of the boat is supplied in a flat panel pre-cut kit for easy building by anyone., prowler 1040 gtr study plans - pdf, flybridge model.  Sedan Model Growler 950 VT The ‘Growler 950 VT’ Power Cat offers unparalleled living space. Open living areas and a sense of light flow through the interior design of this boat. The secret behind this is her unusual underwater hull shape. We have managed to achieve a blend of characteristics that has not, until now, been possible to achieve in a power cat. This amazing boat has the ability to plane. The new underwater shape as well as opening the space in the hulls allows the boat to have enough surface area to propel her onto the plane, offering high speeds and great fuel efficiency.She is available in a fully pre-cut duflex kit or built to any stage by one of our associated professional boat builders., the growler 950 vt is a mid-sized planing hulled cruiser that will sleep 4-8 family or friends comfortably., growler 950 vt study plans - pdf.  Growler 650 VTThe growler 650 vt has been designed specifically for those interested in a fast, practical run-a-bout for fishing, over-nighting or sports, with three different versions available.. These cats have found huge favour locally and worldwide with special interest from France and New Caledonia. It is refreshing to see some people appreciating the ‘true’ multihull values of a proper A hard-top cover provides much needed shade when out on the water, as well as plenty of space to work while remaining extremely stable in even the largest swells. She has excellent load carrying capabilities, and can be loaded with equipment and passengers more so than other boats of similar size. Or perhaps just to bring home all the fish! The reduced size bimini reduces interference with rods and casting. A small fridge can be installed, and theres plenty of rooms for eskies. between speed and luxury.Growler 650 vt study plans - pdf, growler 650 vt fishing, the growler 650 vt fishing has been designed specifically for those interested in a fast, practical run-a-bout for fishing. a hard-top cover provides much needed shade when out on the water, as well as plenty of space to work while remaining extremely stable in even the largest swells. she has excellent load carrying capabilities, and can be loaded with equipment and passengers more so than other boats of similar size. or perhaps just to bring home all the fish the reduced size bi-mini reduces interference with rods and casting. a small fridge can be installed, and theres plenty of rooms for eskies. floor space is kept flat with one step forward to maximise the room when fighting a big catch. the growler 650 vt fishing is the ultimate fishing machine, growler 650 vt sports.  The Growler 650 VT Sports is the ultimate run-about for waterskiing, wakeboarding, or simply taking out friends and family for a day on the water. With plenty of seating for 6 passengers, or more should you require – you won’t have to leave anyone at home. Perfect for loading the camping gear and taking off up rivers, creeks and inland waterways, as well as extremely seaworthy for those adventures that take you out into the ocean swells. Easily beached, just raise the outboards or anchor and swim from the transom. Depending on your needs, a small 12v fridge (and port-a-potty) could easily be fitted to keep the beer cold while lazing on the beach. This is a new take on the ‘bowrider’ style, with good looks, extraordinary speed and fantastic fuel economy.Growler 650 vt cuddy cabin, the growler 650 vt cuddy is our third option for the ultra-efficient registered vt (vapour trail) hull shape used on the 6.5m platform. she boasts a surprisingly roomy cabin, with a double berth from which a table extends to create a dinette if required. a small fridge, small gas cook-top and port-a-potty can also be installed if desired. this little weekender is perfect for inland lakes or skipping out to the islands at a top speed or 45 knots (depending on engine choice). exceptional ocean going ability is a key feature. the cuddy can also be trailered and stored in the driveway during the week. built from balsa-core duflex panels, this tough little cat is perfect for those weekend trips with friends and family or a romantic retreat with a partner.. Messing about in boats since 1975. Online Since 1997. Home | Intro | Our Design Process | Stock Design Info | Motor Yacht Designs | Sailing Yacht Designs | Prototype Designs Plans List | Articles | Our CAD Design Stream | Maxsurf | News..! | SITE MAP..! | Site Search | Design Team | Contact Us Please see the AVAILABLE BOAT PLANS web page 35' Aluminum Power Catamaran "Twee Schoenen" Exterior Profile | Interior Profile & Arrangement Hull Model Perspective Above | Hull Model Perspective Aft Copyright 2003 - 2011 Michael Kasten General Concept The name "Twee Schoenen" is Dutch for "Two Shoes" which captures both the general look of the boat (Dutch) and the twin-hull type (Two Shoes). Aesthetically and functionally the boat would be very much at home on a Dutch canal... The 35 foot aluminum "Twee Schoenen 35" is a displacement power catamaran, having a "tunnel-hull" and modest beam. This design was developed in order to provide a stable platform capable of high displacement speeds, and also capable of long range at lower speeds. Design waterline length is 32.8 feet. Moulded beam is 14 feet. Displacement is intended to be 24,000 lb. light, and 28,000 lb loaded. Hull depth is 2.6 feet from the Reference WL. As is usual for a power catamaran, twin engines are specified, providing redundancy of get-home power and shallow draft for cruising in thin water. Twin hulls also allow the boat to be beached and still remain upright at low tide. As originally planned, starting right forward the interior begins with a large dinette table surrounded by a wrap-around seat. Aft of that is a large desk to port and a galley to starb'd. Aft to port is a head compartment, and to starb'd is a double berth, enclosed for privacy. Within the pilot house is a chart desk to starb'd and a helm to port. Access to the engine space is provided via two hatches, one below the pilot seat, and the other below the chart desk. As originally designed, aft of the pilot house there is a cockpit with seating all around and a secure coaming. The long forward cabin has a downward sloping curve in order to maximize the headroom in the galley / dinette area, while still allowing the maximum view ahead from within the pilot house. On review of older power vessels from the 20's through the 60's there are numerous examples of similar roof lines. In order to avoid the usual "flat" and rather dull sheer line often found on power craft, a pronounced sheer line was used. This allows a substantial bulwark forward for protection of the cabin, and for security while walking around the side and forward decks. Just forward of the cabin is a forward facing seat which hides the two anchor winches and provides storage for lines and other gear. A small shore boat is stowed above the pilot house, lifted in place by the mast and boom. Hull Design Notes The owner wanted a vessel with an asymmetric tunnel hull. The original request was for a trailerable vessel for use in Hawaii. This imposed a limit on overall beam of around 14 feet. The original request also included the capability to travel between the US mainland and Hawaii, thereby requiring a large fuel capacity, and reasonable efficiency at low speed for long range travel - strongly favoring the use of propellers rather then jet-drive. The hull form that was chosen is based on similar types that are used in a variety of configurations for sport fishing, as landing craft / small ferries, and as rescue boats. In order to develop the design we followed in the tradition established for these types of craft in England and in South Africa. The overall approach with these hull types is to take a typical "mono-hull" hull type, cut it in half lengthwise, move the two halves apart, plate the inner face using flat panels, and provide a radius at the top in order to create the tunnel. This is a practical approach for the sake of ease of construction. The benefits with this kind of hull are to help eliminate wave pounding, to carve turns, and to eliminate potential wake interference between the hulls. This hull type is suited to sizes from around 35 feet and larger. In order to achieve the speed potential of this type of vessel, light weight, low superstructures, and high power are essential. For maximum "lift" a greater beam would provide a substantial benefit, as would fitting foils in between the hulls. Construction is in all aluminum alloy for the best combination of lightness and strength. With a total re-design of the structure, GRP construction would also be possible. Photo Courtesy of Monroe Woollard Powering Options... Several powering options were considered for the Twee Schoenen, including the use of passive near-surface hydrofoils to span between the hulls in order to achieve greater lift and higher speed. Due to the compact size of the vessel and relatively heavy waterplane loading, it was determined that the foils would probably not provide the upper range of high speeds expected, even though foils might still offer a benefit in terms of lift. The engines chosen were twin Steyr 230hp diesels with ZF 220 down-angle gears. Made in Austria, the Steyr engine is very compact, has an excellent warranty for commercial use, produces high power for its size, and is not too heavy. It was elected not to use hydrofoils, though it is possible they could provide added lift and consequently provide improved top speed. Chartering / Commercial Options... After numerous tweaks and owner-specified additions during the design process, including a completely revised interior configuration, the design was approved by Transport Canada for use as a passenger carrying vessel in Canada. The new layout is shown in the following images... Chartering Layout Profile | Chartering Layout Plan View In the Commercial Layout, the galley is aft to starb'd, opposite the head. This opens the whole forward area for seating, or for possible other uses... For example, the forward area could be made quickly convertible for over-night use by a smaller group, or as a research lab for extended on-site monitoring, or as a dive shop, or as a light cargo area... all of which illustrate the flexibility of the Commercial Layout having the galley and head aft. On eco-tours, the forward area provides seating for twelve. Kayaks can be carried on deck. Via the ladder on the bow there is easy access for divers or directly onto the beach for exploring the islands. Since she will safely sit upright on the beach with the propellers clear of the hard, areas with extreme tides offer additional intrigue... As-built, the Twee Schoenen is Canadian flagged, approved for passenger carrying by the Canadian Coast Guard and Transport Canada, and is operated out of Campbell River, British Columbia. As of mid-2009, the Twee Schoenen is being offered for sale. For details, please inquire . Design Info... If designed strictly for speed, the essential ingredients will always be light weight, limited superstructure, adequate water-plane area, sufficient overall length, and high power. With a tunnel hull, there is also the excellent option to use hydrofoils fitted in-between the hulls. While not presently fitted, they could be very easily added, and would provide quite a lot of additional lift for better performance at speed. For example, if the design were made larger, say to 40 feet or more on deck, and the individual hulls made slightly wider, there would be a much larger water-plane, resulting in a dramatically reduced load per unit of water-plane area. This would translate into much greater dynamic lift and a much higher actual planing speed. Prototype designs that illustrate this potential can be found on our Power Prototypes web page and range in size from 50' to 120'. All have excellent potential for long range voyaging, or for shorter range at speed. For more information about these vessels, please inquire . Please see the AVAILABLE BOAT PLANS web page. Home | Intro | Our Design Process | Stock Design Info | Motor Yacht Designs | Sailing Yacht Designs | Prototype Designs Plans List | Articles | Our CAD Design Stream | Maxsurf | News..! | SITE MAP..! | Site Search | Design Team | Contact Us
 25' AmeraCatThe 25' AmeraCat is the first ever fully functional single engine catamaran fishing boat. The 25' AmeraCat is now available to the public.  Commercial CatamaransAmeraCat is an exceptional platform for many types of government, law enforcement, and commercial use. AmeraCat is presently in service with St. Lucie county Sheriff’s Office, Fort Pierce Police Department, Dixie County Sheriff’s office, Sanibel Island Police Department and Ft. Pierce Harbors Pilot’s Association meeting and exceeding their expectations for tactical operation requirements everyday on the water.  27' AmeraCatAmeraCat took the original 27′ Gen1 power catamaran and changed things up a little. We added higher gunnels, more displacement and added more interior space by increasing the beam to 9′. The 27′ Gen2 is great for any recreational or commercial use and can be fully customized to meet your needs. With great handling from this center console fishing boat, docking the 27′ Gen2 is a breeze.  31' AmeraCatAmeraCat wanted to design a power catamaran that was in between 27′ and 39′, that is why we created the 31′ AmeraCat center console power catamaran. We feel that for the sport fisherman, this is one of the best offshore fishing power catamarans we offer. Great for Charter Boat Captains as well as the everyday fisherman. AmeraCat Custom CatamaransIf you are ready to demo one of our Commercial or Recreational Offshore Fishing Catamarans, click the link below or call us directly at (772)359-3641. Call Us Now Recreational Catamarans AmeraCat Power CatamaransAmeraCat offers a variety of Center Console Fishing Catamarans, ranging from our 25' AmeraCat Hybrid to our 39' AmeraCat. All of our models are made with NO WOOD, rather with high density foam and hand laid construction. All of our offshore fishing catamarans are custom built to your specifications and you always deal with an owner of the company, not a salesman. Click below for more information.  Commercial Power Catamarans By AmeraCatAmeraCat is an exceptional platform for many types of Government, Law Enforcement, Towing vessel and any Commercial use. AmeraCat is presently in service with St. Lucie County Sheriff's Office, Fort Pierce Police Department, Dixie County Sheriff's office, Sanibel Island Police Department and Ft. Pierce Harbors Pilot's Association meeting and exceeding their expectations for tactical operation requirements everyday on the water. Build-A-Boat Build Your Own Custom Catamaran With AmeraCatChoose all of your upgrades and choose all of your own unique specifications for your new AmeraCat Fishing Boat. We have many different options to add to your new Power Catamaran. Add features like additional rod holders, outriggers, down riggers, dive platforms, bolster cushions, or any of our custom upgrades. We want you to build your offshore fishing catamaran just the way you want it. Click the link to create your custom catamaran. Options/Accessories Options To Fit every NeedWhen it comes to creating your custom offshore Fishing Catamaran, it is important to have all of the accessories you need. Whether creating an offshore fishing machine, dive boat or just your regular offshore cruising boat we have all of the custom options you could need. We design everything unique to your own specifications. We want you to be able to have your boat just the way you want it. We have below a few options for you to view. Be sure to add any custom options in the Build-A-Boat form when you are ready to design your AmeraCat. Privacy Overview design portfolioPlease click on individual designs to review details We invite you to look through our design portfolio. Please filter by Power, Sail or Commercial.  21m Alloy Planing Power Cat 20m Performance Sailing Catamaran 19.8m Displacement Power Cat 18.5m Performance Sailing Catamaran 19m Planing Power Cat 17m Passenger Vessel 15.9m Performance Cruising Sailing Cat 16m Composite Planing Power Cat 16m Composite Displacement Hull Power Cat 14.6m Steel Pilothouse Cruising Yacht 15.3m Pilothouse Cruising Yacht 15m Workboat Powercat 14.6m Composite planing power cat 15.2m Semi Displacement Pilothouse Cat 14.8m Planing Power Cat 14.15m Composite cruising sailing cat 13.5m Composite Cruising Sailing Cat 13.75m Workboat Cat 13.7m Semi displacement power cat 13.8m Semi displacement power cat 13.6m Composite Planing Power Cat 12.55m Composite cruising sailing cat 13.1m Composite planing power cat 12.6m Composite Planing Cat 12.2m Pilothouse Cruising Yacht 12m Alloy Displacement Hull Charter Fishing Cat 12m Displacement Power Cat 10.7m Cruising Sailing Cat 10.4m Composite planing launch 10m Alloy planing cat 11.14m Alloy Planing Catamaran 10.35m Cruising sailing cat 10m Plywood Cruising Sailing Cat 9.5m Composite planing power cat 10.2m Composite Displacement Power Cat 10.10m Composite Planing Cat 9.3m Commercial Charter Fishing Catamaran 8.6m Alloy Planing Cat Arrowcat 30 7m Outboard planing monohull day cruiser 6.7m Alloy Planing Monohull 'Bay Boat'
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12m Alloy displacement hull. There have been several variations of this design built in NZ by Alloy Cats. This is a well proven displacement hull cat with a good turn of speed and very good fuel efficiency. Optimum engine size is around 160 hp for a top speed of around 23 knots. A couple of iterations have used larger engines of 270 hp with a ...
The power needed to do 30 knots is about (2) 450 hp or 900 hp. One live example of a displacement catamaran is the HoloHolo on Kauai. See www.holoholocharters.com Its 62' long, weighs about 25,000 lbs, has a pair of 440 hp engines and operates in some of the most severe waters in the US.
We have now designed a large number of displacement power cats exemplifying the "long and slim" approach of powerboat design. The Zenith-47 displaces 13 tons fully loaded, and motors at 20 knots maximum much more economically at 16 knots with only two 122 kw (160 HP) pushing hulls with a 24.5 knot hull speed.
Our first displacement hull powercat. The owner of this cat has had previous experience with small displacement power cats, actually converting an old Tornado sailing cat to a decked in power cat which was a fairly successful project, up to a point, and sowed the seed for a more serious attempt in the future. The hull is a displacement type, 13 ...
Composite semi displacement power cat. Cation High performance sailing catamaran. Explore more Sail Designs Lady Sterling Commercial Ferry. Explore more Commercial Designs Tenacity Displacement power cat. Explore more Power Designs My studio is based in Auckland, New Zealand. I believe that the yachts I design should be beautiful, functional ...
The consensus has been that the best boats for long-distance power cruising were heavy, displacement-speed monohulls. Stephen Weatherley, the founder of Archipelago Yachts, has different ideas. ... Not only did Weatherley have no objections to a catamaran hull, but he also saw additional benefits. Catamarans offer a softer ride than a monohull ...
The ultimate power catamaran that surpasses all others. Built by Robertson & Caine and designed by naval architects Simonis Voogd, the Leopard 53 Powercat marries comfort, performance and ease of handling, delivering an unparalleled blue water cruising experience. This 4th generation vessel features all the attributes that made its predecessors ...
The Aquila 70 can top out at 27 knots (with the optional engines) yet still cover long ranges at slower speeds. Power and maneuverability come from Volvo Penta inboards coupled with joystick control. Carbon fiber reinforcements keep weight down while adding to the yacht's strength. The high bridge-deck clearance allows for even more comfort ...
The Prowler 1360 is a semi-displacement power catamaran design, following a more traditional style in comparison to some of the more modern power designs such as the Growler Series. The bows have been kept quite square and sharp, and the cabin features large wrap around windows and angular styling. The foredeck runs forward to the front of the ...
Roger Hills' evolutionary displacement catamaran design fine tunes a boat with acknowledged outstanding performance for the Australian environment. At 10.2 metre waterline length, the displacement hull technology provides an extraordinary smooth ride. ... With less drag, a higher proportion of engine power goes into driving the boat forward ...
The new Leech 1025 Semi Displacement Power Catamaran incorporates the latest thinking from designer Dan Leech. According to Leech, it is the culmination of ten years of design development and refinement of his semi-displacement power catamaran. Being built in Nelson for an Auckland client, the new design will offer an incredibly soft riding ...
Bali Catamarans, a division of France's Catana Group, is offering a 43-foot power catamaran with a beam a little wider than 23 feet and a draft just under 3 feet. Loaded displacement is approximately 20 tons, with a standard 211-gallon fuel capacity or an optional 422 gallons.
The Prowler 1360 is a semi-displacement power catamaran design, following a more traditional style in comparison to some of the more modern power designs such as the Growler Series. CONTACT US FOR MORE INFO The bows have been kept quite square and sharp, and the cabin features large wrap around windows and angular styling. The foredeck runs ...
The Prowler 1500 is a semi-displacement power catamaran design, following a more traditional style in comparison to some of the more modern power designs such as the growler series. ... SDI Prowler 40 Open/Cruiser is a commercial power catamaran, Available at a very competitive price for a motor-away vessel, the Open layout is ideal for dive ...
The 35 foot aluminum "Twee Schoenen 35" is a displacement power catamaran, having a "tunnel-hull" and modest beam. This design was developed in order to provide a stable platform capable of high displacement speeds, and also capable of long range at lower speeds. Design waterline length is 32.8 feet. Moulded beam is 14 feet.
AmeraCat took the original 27′ Gen1 power catamaran and changed things up a little. We added higher gunnels, more displacement and added more interior space by increasing the beam to 9′. The 27′ Gen2 is great for any recreational or commercial use and can be fully customized to meet your needs. With great handling from this center console ...
20m Performance Sailing Catamaran. 19.8m Displacement Power Cat. 18.5m Performance Sailing Catamaran. 19m Planing Power Cat. 17m Passenger Vessel. ... 10.2m Composite Displacement Power Cat. 10.10m Composite Planing Cat. 9.3m Commercial Charter Fishing Catamaran. 8.6m Alloy Planing Cat. Arrowcat 30.
Design Concept. New Zealand multihull designer Roger Hill designed this long-range displacement power cat for an existing client, whose previous boat was sailing cat, also designed by Roger, who is now ready for some long range adventures around the bottom of the South Island of New Zealand in the Summer and cruising around the Pacific islands during the Winter.
With 15" of draft, displacement is 5616 lbs. I think I did it correct, volume of hull in water (ft cubed) x weight of water (62.4 lbs/ ft cubed). The 2 hulls will share bulk heads. A bulk head at every 2 to 4 feet, can't decide. With 1" flat stock aluminum stringers.
SPIRITED 400 'Power'. The Spirited 400 'Power' is a semi-displacement power cat with sleek lines and light weight structure. For those who like 'turn-key' cruising this highly efficient design is always in readiness for a quick getaway. The slim hulls run easily through the water and provide a very comfortable ride even in rough conditions.
Light loaded displacement - m moc: m moc = 0.8 × m LDC m moc = 5709: The light loaded displacement mass (kg); this is the mass we will use in stability and performance prediction: Beam of sailing catamaran : The beam of a sailing catamaran is a fundamental thing. Make it too narrow, and she can't carry sails enough to be a decent sailboat.
The most compelling argument of all must be this: seasoned monohull boaters are converting to catamarans by the truckload. Many converted former motor yacht owners are now passionate advocates of power catamarans. For experienced yachties demanding performance, the advantages are simply too great to ignore. It is rare to hear of any catamaran ...
I give the hydrostatics for 4 drafts covering displacement from 15,7 to 38 kg. And also a preliminary estimation of the drag and of the power estimation (for D 30 kg) using "SA-VPP power catamaran" application, althought the conditions of validity are not fulfilled (for Froude > 0,4 part of the application). More on the application here :