semi displacement power catamaran

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BOAT REVIEW L980 semi-displacement powercat Emocean

• Good separation of spaces
• Secure handling and a dry, smooth ride
• Feels like a bigger boat
• Efficient, foil-assisted hulls provide economy and speed with modest power
• Designed to be trailerable

Boat designer Dan Leech has made a name for himself designing small semi-displacement powercats. The L980 Emocean is his latest.

Sometimes with boats, you don’t know how good they are until you give someone else the helm, hop off and take a look for yourself. Watching your boat go by is the best way to get an honest appraisal. At least that is what crossed my mind as we bobbed around in a RIB with owner Randall Diggs, while the designer of the new L980 Emocean , Dan Leech, did whistling flybys for the camera.

When good design and innovative technology meet meticulous boat building and finish, you always going to have something special. The meticulous bit belongs firmly to owner and self-taught boatbuilder, Randall Diggs, who has just launched Emocean . The good design bit comes from Dan Leech, who has established himself as a leading name in the growing market of small semi-displacement power cats in New Zealand. Combined with the use of semi-foiling technology, the result is exceptional economy, an unbeatable ride, and comfortable cruising. In short, it is impressive.

Construction Having been converted to the power cat idea with his previous boat, a Leech L875, Randall Diggs set about commissioning a bigger model. Only a metre longer but an exponentially bigger boat all around, the bare hull of Emocean was built at Davie Norris Boat Builders in Christchurch and finished off by Randall over an 18-month period, most of it during the covid pandemic.

Layout Semi-displacement power cats work well when the hulls are narrow and the bridge decks high. Dan Leech has incorporated some eye-pleasing lines into this basic concept that give Emocean handsome looks. She has a reverse sheer in the forward sections, accented by a spray chine that runs the length of each hull and terminates at the plumb bows with a step, thus achieving a good interior room with a dry ride. The reverse sheer gunwale allows full-standing headroom throughout the interior and allows the pilothouse to integrate nicely with the steep sides of the hull.

On the Water The first impression of L980 is of elegant space. It is hard to believe you are on a 9.8-metre boat when the feeling is more like a 12-metre boat. The space has been arrived at largely by extending the efficient layout of the smaller Leech models. With storage to soak up the clutter and a clean-flowing deck layout, the vessel always looks like it is ready for a photoshoot for a glossy boating magazine. A closer look at the boat reveals some clever detailing created by Randell over the solid bones of the base design. Walking through the boat every corner angle and detail has been thought through making it feel seamless. This functionality is achieved by keeping the berths and toilet facilities on a lower level, while the helm, galley, and socialising areas are up high in the saloon. The separation of space works well offering a private retreat that is essential to good morale aboard while cruising. Opening up the aft end of the saloon to the deck creates a spacious feeling to the living area. Most launches of this length are only sophisticated day boats, but you get the feeling that Emocean could provide very comfortable cruising for over long periods.

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When the itch for another boat project required scratching a little over two years ago, de Fluiter decided that repurposing a Vindex 350 flybridge would be quicker than building another new boat.

Cora 48 Catamaran

Performance is modest, as expected for its power-to-weight ratio, but nearly 17 knots of speed was available when I used maximum throttle.

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Fifteen knots eased back to about 10 knots and the boat felt light on the helm, responding nicely to changes in wind pressure as they came through.

Buccaneer Five Seven Five

The spacious cockpit is uncluttered but has plenty of seating. The cockpit sole is covered in SeaDek. The bolster-equipped helm chairs are a decent size and proved comfortable even in the lumpy conditions we experienced.

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L925 Semi Displacement Power Cat

Since the end of the 1980s, home-building a boat has gone a bit out of fashion... It’s really only seen in Australia and New Zealand with much enthusiasm nowadays. But in those waters, small multihulls are very popular! What if the rest of the world followed suit? 

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Published 07/07/2020

By Emmanuel van Deth

Published: aug. / sept. 2020

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Issue #: 14

Published: August / September 2020

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New Zealand-based naval architecture firm Dan Leech is offering a number of power multihulls for amateur or professional builders. Among them, the L925 is the perfect choice for relaxed cruising for a couple. This model is built in ½” (12 mm) plywood - the panels can be digitally cut - with glass/epoxy reinforcements. Its limited beam will allow you access to a marina slip without any noticeable extra cost. On the other hand, the gain in habitability and stability is considerable compared to a single-hulled motorboat. This kind of construction is very accessible to an enlightened amateur (4,000 hours of work were counted for the first model) all the more so as having outboard motors for propulsion considerably simplifies the technical aspects. Despite its semi-displacement hulls, the L925 is capable of making than 20 knots with two 90 hp engines.

Construction: Amateur or porfessional (MG Composites NZ) Architect: Dan Leech Naval Architect Length: 30’4” (9.25 m) Waterline length: 24’9” (7.55 m) Beam: 11’ (3.35 m) Draft: 19” (0.48 m) - engines up Recommended engines: 2 x 90 hp outboards Cruising speed: 17 knots Max speed: 22 knots Fuel capacity: 79 US gal (300 l) Water: 52 US gal (200 l) Number of cabins: 2

www.leechboats.com

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Tag: prowler power catamaran design by sdi

Growler 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 INFO

Current 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 Soon

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 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/Cruiser

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-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 VT

The 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..

13.8m Semi Displacement Power Cat

Super yacht fitout in 14m.

This semi displacement power cat was built in Australia for a couple that intends to cruise extensively along the Queensland coast, Barrier reef, and associated outer islands.

With a similar very efficient semi displacement hull form to the slightly smaller 13.7m sister ship, this cat in comparison has a more extensive area of accommodation and shaded deck areas for the hot climate it will be operating in. Four sleeping cabins will cater for the occasional trip when the extended family is on the boat. Other essential equipment for tropical cruising and living aboard include a gen set and air conditioning, water making, and laundry.

Powered by a pair of 370 hp engines she has a top speed of 24 knots and the potential for very long range at lower cruising speeds, optimum cruising speed is in the 14 to 16 knot band with a range of approx. 700 NM at that speed.

Other features of this hull type are the shallow draft, prop protection and ‘beach ability’.

Sea keeping, handling, stability, and maneuverability will be superb. 

This design is now available in alloy with a composite flybridge. The alloy hull is 14m long, all other design characteristics are similar to the 13.8m. Please have a look at the  www.alloycats.co.nz web site for more information.

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