France-based shipyard COUACH delivered the second one of their 5000 FLY series named Belongers.

The 49.90m Belongers is equipped with SilentCab® and VRS® (Vibration Reduction System) technology to provide a high level of comfort. Constantly leading the way in the development of new technologies for shipbuilding, Couach now redefines the standards of onboard comfort, offering a new sailing experience on one of the fastest yachts in its category.

Couach hulls, already renowned for their unequaled sea keeping qualities, make each cruise a genuine experience where safety, power, and fluidity prevail.
On board Belongers, the onboard comfort is the plus point that makes this yacht exceptional. The outer layer of Belongers, very similar to La Pellegrina (COUACH 5000 FLY #01), in all reality hides a major technical revolution. Faced with the challenge of a particularly demanding owner, COUACH has completely revisited the design of its 5000 FLY to meet the level of comfort required (in terms of noise and vibrations), both moored and at sea.

Couach 5000 FLY Belongers
Couach 5000 FLY Belongers

Developed by Couach’s R&D department following an exhaustive study carried out in conjunction with the VAN KAPELEN acoustics expertise agency, the exclusive suspension system SilentCabTM consists of disengaging the cabins from the source of vibrations. As if suspended, the cabins are isolated from the noises and vibrations caused particularly by the generators and engines.

VRSTM (Vibration Reduction System) skilfully complements SilentCabTM by providing an adequate and systematic response to vibrations generated by all the onboard systems. The complexity of vibration phenomena on the different navigation regimes and the interactions between different materials makes it necessary to establish a model and to analyze each parameter. It is the shipyard’s capacity to both take all these parameters and their interfaces into account and to implement a mix of preventive or corrective measures that make it possible to achieve the performances obtained.

Couach 5000 FLY Belongers

And this has been successful, with noise and vibration test results far exceeding the ambitious objectives set by the owner. With just 42 db at 12 knots, noise levels in the owner’s cabin are well below those of the quietest luxury sedan car. When moored, levels drop to 35 db; comparable with the sound of wind rustling through the trees.
The chart below clearly illustrates comfort perception and puts noise levels into perspective:
Equally, particular attention has been paid to vibrations, which are often a source of discomfort. Vibration tests display the same level of excellence with, for example, 1,78 mm/s measured in the upper deck saloon at 12 knots, against an average of 3 mm/s on most yachts on the market.

Video of  sister ship La Pellegrina

This technological performance is all the more significant as each modification made to the structure, hull or assembly methods is characterized by an influence on the design, the associated systems, the boat’s weight and trim, while always retaining the same performances in terms of resistance, speed, and power consumption.

Its top speed of 28,3 knots, measured on heavy seas, makes Belongers one of the fastest boats in its category. This, associated with its legendary hull, makes it possible to navigate in delicate weather conditions with the required reserves of power. This second COUACH 5000 FLY unit also offers efficient energy consumption and transatlantic autonomy at cruise speed.
Beyond simply validating the technical excellence of one of Europe’s oldest shipyards, these results also underline the merits of choosing to work with composite materials, including on super yachts of this size.
The overall construction of Belongers has benefitted from the scrupulous follow-up provided by Wintherbotham surveyors.

Among other things, Belongers illustrates Couach shipyard’s legitimacy in the realm of super yachts, having proved its capacity to execute a superb finish that meets the requirements of a justly demanding clientele. The owner and his surveyors have expressed their satisfaction in terms of construction quality and the impeccable finish for a vessel delivered on time.
This quality can be seen in the perfection of the interior fixtures, the result of the shipyard’s craftsmen’s know-how and a fruitful collaboration with METRICA® Interior. In pure COUACH shipyard tradition, the owner played an active role decorating and customizing the fixtures of his yacht in its entirety, creating his dream yacht, drawing on his fve years’ charter experience on the most prestigious super yachts.

Concerning the delivery of Belongers, Christophe Kloeckner, President of Couach shipyard states:

“Thanks to the innovations developed on this new 50-meter unit, COUACH reasserts the identity of the brand: intelligent shipbuilding and technological superiority, reflected in navigation comfort. Beyond these words, we highly appreciate the admiration and extreme satisfaction expressed by the owner’s experience sailing his COUACH. Couach’s R&D department is currently working on new technological innovations that contribute towards improving comfort, in order to maintain and strengthen this leadership”.

Main Specifications

Length over all:49.90 m
Beam:9.33 m
Draft:2.35 m
Max. speed28 knots
Cruising speed24 knots
Engines:2 x MTU 20V4000M93 5230 HP (3900 Kw @2100RPM)

About Publisher

Yacht Blogger / Yacht JournalistAhoy, I’m René, the “captain” of this luxury yacht blog. I found my passion for the big ones in 2002 (at the age of 17). I have grown up with sailing since a little child. I have an education in Business Informatics and specialized in digital media solutions (alongside luxury yachts) like Online-Marketing, User Experience Design et cetera. My home port is in Oldenburg, Germany next to Lürssen and Abeking & Rasmussen. More about yachtemoceans

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