Yara 44, ISA Yachts’ 1st Fast Displacement Project

ISA-Yachts-Yara-44-2ISA Yachts has earned a reputation for building stylish, swift yachts, but it’s also expanded into displacement yachts. Thanks to the Fast Displacement Hull Form by Van Oossanen Naval Architects, its clients no longer have to choose efficiency over speed, or vice versa. ISA Yachts is offering a new design, the Yara 44, with the naval-architecture firm’s patented hull. There’s also a larger version, the Yara 48. The Yara 44 and 48 should further be of interest to buyers who want a real twist on indoor-outdoor living and particularly ones in the Americas, given Bahamas-friendly drafts.

The Yara 44 (“yara” is a water nymph in ancient Brazilian folklore) measures 145’7” (44.4 meters). The Yara 48 measures 156’8” (47.78 meters), sharing the same hull. As we’ve explained in previous articles, the Fast Displacement Hull Form is efficient throughout the full speed range, not solely toward top end. This can mean a 30-percent better fuel burn at cruise and 15- to 20-percent better burn at maximum speeds. The all-aluminum Yara 44 and 48 will each have a beam of 29 feet (8.85 meters) and promise equal performance figures. Van Oossanen Naval Architects anticipates a top end exceeding 24 knots with twin MTU 16V 2000 diesels. Optional 12V or 16V 4000s should permit 27- and 30-knot top ends, respectively. Transatlantic range is, of course, calculated into the equation as well. With the standard engines, the Yara 44 should achieve it at 13 to 14 knots.


There is one slight variation in the two hulls: draft. The Yara 44 draws 6’7” (2.05 meters), while the Yara 48 draws 7’1” (2.16 meters). Regardless, both will allows owners to enjoy skinny-water cruising in the islands.

Besides these requirements, ISA Yachts wanted the Yara 44 and 48 to offer more versatility for indoor-outdoor living. Plenty of yachts have sliding aft-deck doors that can remain open, and/or sliding hardtops. But, the room remains walled in to both sides, even if there is full-height glass. The Yara yachts eliminate the walls by making them slide and fold. The concept is similar to what is aboard only a handful of yachts, like Smeralda. The design was created by Omega Architects, while still respecting ISA Yachts’ DNA.


Take a close look at the sketches above. The top left image shows the Yara 44 with the glass walls in place, akin to a traditional saloon. Though, even with them this way, the yacht offers great views, thanks to lowered bulwarks (as best seen in the bottom-most profile image). Follow the arrow down to the next image: The outer glass walls slide aft, and the aft-deck glass doors fold outboard. Then, as the top right image shows, the Yara 44 gains a doubly long alfresco lounge area.

Speaking of that lounge area, ISA Yachts didn’t want the hot tub to interrupt the profile nor views from inside. Omega Architects therefore penned it to be essentially flush with the teak-lined deck. The waterfall emanating from the upper deck’s overhang is another nice touch, especially if lit at night (below).


Other highlights of the Yara 44 and Yara 48 include four guest staterooms below decks and a main-deck owner’s suite. The latter benefits from bulwark cutouts running the length of the room. The beach club offers a choice of a sauna or a steam room, paired with a bar and day head. Because the main decks aboard the Yara 44 and 48 emphasize relaxation, the galleys go below, in the forward crew area. Toys go on the foredeck due to the beach club. More relaxation takes place aft of the wheelhouse and on the sundeck. To preserve openness up here, the masts for the Yara 44 and 48 have pedestal-like legs. Aboard the 44, a bar and pop-up TV is centered beneath the mast. On her bigger sister, there’s a hot tub and sunbeds. Otherwise, dining and seating areas are on both designs.

For more information directly from ISA Yachts about either the Yara 44 or Yara 48, fill out our contact form.

Alive, Hull-Vane-Equipped Heesen, Nearing Delivery

PHOTO: Dick Holthuis

PHOTO: Dick Holthuis

Heesen’s YN 17042, christened Alive, is expected to be handed over on October 31. She’s the shipyard’s first megayacht equipped with an efficiency-enhancing Hull Vane foil.

Launched in August, Heesen’s Alive is only just now allowed to be shown and publicized under her real name. However, Heesen was permitted to divulge some details about her under her hull name, referenced above, over the past year or so. LOA for the steel yacht is 139 feet (42.4 meters), and she’s highlighted by two significant engineering features. The first is a fast-displacement hull form, which permits good fuel burn at both ends of the speed spectrum. Her power package: twin 1,450-hp MTU 12V 2000 M72s. Naval architecture for the hull, and the yacht overall, is from Heesen’s in-house team and Van Oossanen Naval Architects. The second engineering feature is the Hull Vane foil. Van Oossanen developed and patented the specific design of this foil. Foils, also called wings, reduce fuel burn, reduce drag, create thrust, and reduce pitching. Alive is the first yacht to feature the Hull Vane foil. (Van Oossanen has seen it retrofitted onto commercial vessels.)

Now that Alive is in the water, Heesen can reveal more information. Thanks to the Hull Vane, Alive should need 35 percent less power than comparably sized yachts to top out near 16 knots in flat-calm conditions. Of course, yachts don’t always encounter those conditions. To that end, the Hull Vane reportedly reduces pitching by 40 percent in three- to 10-foot (2- to 3-meter) seas. In those same seas, Alive should gain 20 percent thrust as well. It’s because as a wing, the Hull Vane generates lift, which encourages momentum. Furthermore, Alive should burn 30 percent less fuel at 12 knots, her best-range speed, than a traditional displacement yacht of her LOA. (At that speed, she’ll achieve 4,000 miles.) Sea trials over the next few weeks are anticipated to confirm all these figures.

Once handed over, Alive will entertain a party of 12, amid spacious areas designed by Omega Architects. Two master suites are aboard, one on the main deck (with a balcony) and the other on the upper deck (with a private gym). The second stateroom is also circular, with the bed at its center to take advantage of the views out the full-height glass windows. The 29’5” (9-meter) beam should further make the sun deck and other common areas quite comfortable.

Mulder 34m Motoryacht Making Progress

Mulder-34m-Motoryacht-1There’s a good reason why all those people you see aboard the Mulder 34m Motoryacht are celebrating. The steel hull and aluminum superstructure had just been joined together. It marked an important milestone for the largest Mulder Shipyard project to date.

The Mulder 34m Motoryacht, 111’6” LOA, isn’t just the Dutch builder’s largest in terms of size. She’s also the highest tonnage, 315 gross tons. That further makes her the yard’s first yacht to exceed the 300-gross-ton threshold.

The hull and superstructure were built offsite and fastened together outside of Mulder’s facility in Zoeterwoude-Rijndijk. The plumb-bowed Mulder 34m Motoryacht was then fitted with her gensets and twin Caterpillar engines. (A displacement yacht, she should top out at 13 knots.) Following this, she was floated inside of the finishing shed. Since the interior was already being assembled, work should continue to progress well.


With a 26’3” beam, the Mulder 34m Motoryacht bears naval architecture by Van Oossanen Naval Architects and styling and interior design by Claydon Reeves. An owner’s party of eight can stay aboard, in convertible cabins. Two staterooms have twins that push together for doubles. There are also essentially two master suites, one below decks and one on the main deck. They’re close in size, too: 344 square feet (32 square meters) and 301 square feet (28 square meters). The below-decks master spans the full beam and has large ports. The other features a skylight. Seven crewmembers are also accommodated.

Speaking of light, the Mulder 34m Motoryacht brings in plenty of sunshine thanks to full-height glass flanking the dining area. The starboard-side glass is within sliding doors, too. That in turn leads out to a folding balcony.

This first hull has been sold. For now, Mulder refers to her as BN100. Her owner will take delivery next summer. She’ll meet RINA classification and further comply with the LY3 requirements of MCA. Her seven-foot (2.15-meter) draft shouldn’t restrict her from many ports.

The builder has a terrific video of the joining of the hull and superstructure.

Azamanta, Heesen YN 17255, Fast Displacement Update

Heesen YN 17255

PHOTO: Dick Holthuis

The last day of February saw the hull and superstructure of Heesen YN 17255, a.k.a. Azamanta, joined. The megayacht marks the first steel 180-foot (55-meter) Fast Displacement project for the yard. She’s also the fourth to feature the Fast Displacement Hull Form (FDHF) created by Van Oossanen Naval Architects.

Heesen YN 17255 is about a year away from sea trials. However, Perry van Oossanen of the naval architecture team predicts she’ll see 15 knots under just half power. Heesen says she’ll also see a 16½-knot top end. It further states she’ll achieve a 4,500-nautical-mile range at 13 knots. It’s all due to the FDHF.

You may recall that Van Oossanen Naval Architects presented the FDHF concept at a marine trade show in 2009. Heesen was the first yacht builder to sign on to use it. It’s more slender than the typical round-bilge, hard-chine hull that most megayachts employ. Tank tests further show it kicks up smaller wakes, has good seakeeping abilities, and requires less fuel consumption throughout the speed range. The latter is key. Perry van Oossanen explains, “The typical load profile of a motor yacht often consists of long-range cruising at low speeds and only short periods of time at higher and maximum speeds. This indicates the need to focus hull design over the entire speed range rather than on maximum speed only. The FDHF incorporates design features that have a large effect on hydrodynamic resistance over the whole speed range, such as the area of the immersed transom, bulbous bow, trim control and spray rails.”

Heesen YN 17255 will treat her owners and guests to more than just performance. A forward garage with gull-wing doors will house tenders and toys. This allows a dedicated beach club and gym in the transom. The megayacht will additionally have accommodations for 10 guests plus the owners. Special friends or family will get the full-beam VIP stateroom. The owners, of course, get a main-deck suite with a private 753-square-foot (70-square-meter) alfresco area. Sinot Exclusive Yacht Design is overseeing the interior.

The video below is a time-lapse look at how the hull and superstructure came together.

Megayacht News Onboard: Heesen Yachts’ Galactica Star


PHOTOS: exteriors by Jeff Brown; interiors by Churchill Interiors

At 213 feet (65 meters), Galactica Star is Heesen Yachts’ largest megayacht to date. Heesen is known for its sleek, fast yachts, and Galactica Star is in keeping with that philosophy. But, the megayacht puts a significant twist on it. Sure, she’s capable of a reported 28-knot top end. But, Heesen says that Galactica Star does so while burning 20 percent less fuel than comparable megayachts.


Galactica Star employs a hull design called the Fast Displacement Hull Form (HDHF), by Van Oossanen Naval Architects. A patented design, the FDHF blends the best attributes of a traditional displacement hull with those of a semi-displacement one. These attributes are low resistance and higher performance, respectively. The FDHF is also efficient through the entire speed range, rather than at figures closer to top end. By comparison, traditional semi-displacement designs hit a performance hump, where the transition from slower, displacement speeds to higher, semi-displacement speeds occurs. Van Oossanen Naval Architects says the FDHF performs 15 to 20 percent better at displacement speeds. How does this translate to Galactica Star? The megayacht has a reported top end exceeding 28 knots, powered by twin MTUs. She also is said to burn 20 percent less fuel than comparable other yachts and see a reported 4,200-mile range at 14 knots.


To complement Galactica Star’s different hull design, Heesen Yachts’ frequent naval architecture and styling partner Omega Architects worked with Van Oossanen. The goal was to convey a higher-tech look and feel yet still make Galactica Star look like she belongs in Heesen Yachts’ fleet. There’s a decided lack of overhang from the superstructure. Instead, the superstructure is self-supporting, positioned directly on the hull.


Even at the waterline, you can appreciate the unusual styling of Galactica Star. Of course, the megayacht still embraces the features that owners and their guests want, like a beach club. It occupies 829 square feet (77 square meters). It also gains more space via fold-down platforms to port and starboard (visible in the previous photo).


Take a look at the skylight just visible here in the beach club. It’s formed from the glass bottom of the hot tub on the main aft deck. Since Galactica Star’s beach club is permanent, not a tender garage that doubles as a guest spot, it’s fully air conditioned. A small galley lies beyond the bar, too.


Sure to be an equally popular space aboard Galactica Star is the galley. Most megayachts belonging to owners other than Americans tend to treat the galley solely as a work space, rarely if ever visited by anyone other than crew. Aboard Galactica Star, it’s arranged like a chef’s table in a restaurant.


The dedicated guest spaces throughout Galactica Star are unquestionably modern, suiting a higher-tech megayacht. They reflect a combination of Macassar ebony, spruce, metal, leather, and stones, the work of Bannenberg & Rowell. Spaces are also sometimes arranged unconventionally, like here on the main deck. Rather than a typical saloon followed by a dining area, Galactica Star has a three-zone area. In the background, you can see a seating area directly at the aft-deck doors. It flows into this bar/lounge area, complete with a bioethanol fireplace. This in turn flows into the dining area.


Speaking of the dining area, here it is. For a 213-footer—with a beam of 37 feet (11.3 meters) no less—it is far more typical to have either a separate dining room or one that is otherwise arranged to look and feel separate. In contrast—and successfully so—Bannenberg & Rowell have designed it to look and feel cohesively with the lounging spaces.


There’s also a cohesive relationship between the skylounge and alfresco seating/dining area, thanks to doors that can be left open. This makes for nearly 754 square feet (70 square meters) of entertaining space, for small gatherings and large cocktail parties alike.


Come time to retire for the night, the owner of Galactica Star has, as you would expect, a main-deck master suite. Four double guest staterooms are below decks, while a VIP suite is on the upper deck.


Being Heesen Yachts’ largest project certainly makes Galactica Star stand out. But the FDHF makes the all-aluminum megayacht far more noteworthy. Additional Heesen clients are grasping the significance of the design, too. Already, the builder has contracts and/or interest for megayachts from 148 to 230 feet (45 to 70 meters) employing it. It’s good to see design and build teams offer performance solutions that simultaneously preserve a little speed indulgence.

EXTRA PHOTOS: Visit our Facebook page to see more of Galactica Star.