Yacht modification

Riva Duchessa hard top modification

Saint Jean Cap Ferrat, 2020

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On this Riva Duchessa, the owner wasn’t satisfied with the hard top on the fly bridge. It was too small to protect the full area of the flybridge from the sun. So, the goal was to bring more shadow by extending the hard top.

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After several discussions with the captain, we chose the idea of extending the roof aftward on both sides with two fixed elements, and stretching a canvas between its two elements by an electrical system.
Besides, we replaced the central part of the roof by a new one that we built in fiberglass, with 3 spaces in the middle to receive plexiglass in it.

We made every part of this modification in fiberglass by Infusion Technology at the workshop.

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Then, we laminated each piece to the original roof.

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Here’s the job done ! 

Chines Modifications on 30M MY

Golf Juan, 2020

On this 30m yacht, the owner complained about the noise made by the waves on the hull of the boat.
The Argentinian architect Enrique Mitch offered us a drawing of a modification so that the waves no longer hit under the hull of the boat right next to the owner’s cabin. In practice, it was necessary to add elements to create this new shape. The modification concerned approximately 9 meters from the bow. As the boat was made of aluminum, it was impossible to laminate the new elements directly on the hull. So it was first necessary to make two pieces of fiberglass molded on the hull as base for our modifications. These parts have been bonded with a flexible elastomer bond from Kent Marine, allowing a good grip between the laminate and the aluminum of the hull.

We have divided our modification into 4 different pieces per side (8 in total) to facilitate the installation. These pieces were made of fiberglass in the workshop thanks to the Infusion Technology, then laminated one by one to our base.

A serious calculation of the necessary scantling allowed us to keep our peace of mind when the slings came to grab this 102 ton boat !

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New coaming for MY sunbed

Saint Jean Cap Ferrat, 2020

On this 23 M Sunseeker motor yacht, the captain always had a problem when he washed his boat at the sunbed area located at the front. Indeed, as the mattresses are in a space lower than the deck, there was permanently water running in this part of the boat, and the mattresses were never perfectly dry during the summer season.

The project was to design and build a coaming all around the sunbed to prevent water from entering. This new element obviously had to perfectly respect the rounded shape of the sunbed, to give the impression of having been originally designed.

Strat-o-sphere has modeled the sunbathing in 3D to be able to test different aesthetics according to the client’s wishes (height, thickness, etc.). When the project was approved, we made this 2m by 2.2m piece in a single piece of fiberglass using the Infusion Technology, and then laminated it to the boat.

 After the Gel Coat finish and a good polish, our piece seems to have always been there !

Passerelle/Stairs on a 37M MY

This 37 meter motor yacht build in 1967 by Clelands Shipbuilding Company needed a passerelle for her charter seasons.


The passerelle should fit in an inside volume of only 2M10 in the lazaret, and should also be used as a ladder to access to the bathing platform.

No existing passerelle in the yacht market would be adapted to the situation.

A careful study unabled us to find the right design and our answer has been a passerelle made of two parts:

  • One part being located into the lazaret when at rest
  • One part remaining outside and being used as a scale to reach the platform from the main deckreceived_174780505191158520171003_101614

All the elements were made in carbon and glass fiber, and the movement has been made possible thanks to a strait collaboration with GZ Nautica for the rams and electronic.

20171003_100838This boat being used intensely, we followed her in Lavagna and Napoli for the first study of dimensions, constructed all the elements in our workshop, but installed them during the annual shipyard session in Olbia Sardinia.

Length when fully extended : 4 M 70 from transom
Working capacity : 350 Kg


Fly Bridge Hard Top

Saint-Jean-Cap-Ferrat 2013, 

On this 23 M motor yacht, the old bimini made of stainless steel tubes and canvas suffered each year from the sun and rain.

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It was too weak to be left out with big winds and was not giving much protection from the summer heat. It was thus decided to replace it with a hart-top situated in front of the existing roll bar.



This permanent part needed to be strong enough to sustain all bad weather conditions the boat might encounter while remaining light enough to avoid needing extra reinforcement and weight in the upper area.



The careful design of the new shape and its air flow simulation enabled us to keep the windage low even when facing an eighty Knots apparent wind.


A light composite construction allowed us to keep the weight to a minimum. The addition of three apertures equipped with smart glasses made it possible to look at the stars at night while enjoying the shade during the hot sunny days.


Unique piece for international shows

In July 2019, we met the French composer Michel Redolfi (michelredolfi.info), specialized in underwater music. For his next show, scheduled for August 24th in Deauville, he needed a special piece allowing him to “sit on the water”. Having found no satisfying products on the market, he asked Strat-o-sphere to design this new custom-made item.

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Design imagined by Strat-o-sphere

This element had to be at the same time stable, light, resistant, wide, floating but staying at the limit of the water, and needed a certain style to be integrated in international shows.

Strat-o-sphere designed and manufactured this custom made fiberglass piece in a few days by Infusion Technology


After consultation with Michel Redolfi, we chose a white gel coat finish and bamboo plating in the center, on the seat part.

_ Concert Subaquatique Dans le rêve des baleines Deauville 24 août 19 - michel redolfi (1)

This unique piece was delivered in time for the show in Deauville, where we saw the French-American director and actor Jean-Marc Barr lend his voice to the underwater concert “In the dream of whales” …

_ Concert Subaquatique Dans le rêve des baleines Deauville 24 août 19 - michel redolfi

Garage Door

Monaco 2013

Finding an accessible storage place for the fenders was the main issue on this 58 foot motor yacht.ensemble

The idea of opening an access into the garage door was evident, but made difficult due to the reinforcements  and  stringers  located  in  the existing door.IMG_1791

The decision was taken to build a completely new garage door including a small, easy to open, aperture.IMG_1787

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The use of composite under infusion process, allowed us to reduce the door weight by 50 % compared to the old one, thus increasing the storage capacity.DSCN3486

Removable Gangway

Alpes-Maritimes 2012

Approaching the coast with a tender and landing people was the request of the client.

If building a passerelle is simple, installing a removable passerelle on the rocks was a real challenge.DSCN1559

Drilling holes on the stone made it possible to install discrete bolts where the passerelle can be attached in 30 seconds by one person.Image1

Carbon Gangway

Saint-Jean-Cap-Ferrat 2012

On this wonderful Olin Stephens design from 1937 the wooden passerelle needed to be light but strong.athena passerelle

Being on a wooden boat, the finish needed to be “varnished wood”.


The  solution  of  a  carbon/infusion  process construction was chosen for weight consideration. The finish is perfect “wood like” paint. (being close to the real teak bulwark capping rail would not allow an approximate result)

The pleasure of handling a light passerelle is now compatible with the respect of the wooden style of sailing yachts.


Jacuzzi Conception

Monaco 2011

The request of the client was simple : make a Jacuzzi on his boat that could be used in 20 min, the time for him to reach Monaco from Nice airport.dear henricoussin1

The boat had not previously been designed with a Jacuzzi on deck so several issues were to be solved:

  • would the stability of the boat permit the addition of 700L of water on deck?
  • would the structure of the deck sustain it?
  • would the electric installation on board be powerful enough to heat 700 L of water at 34°Celcius in 20 min time?OLYMPUS DIGITAL CAMERA

A study of the metacentric height showed that the foredeck was a place low enough to locate 700 Kg with no significant influence to the stability.

An extra beam underneath the Jacuzzi would distribute the extra weight to the existing structures of the hull.OLYMPUS DIGITAL CAMERA

The addition of water heaters in the front area allowed us to have enough “ready to use” hot water at our disposal to quickly prepare 700 L of warm water.OLYMPUS DIGITAL CAMERAOLYMPUS DIGITAL CAMERA

New teak surrounding surfaces and access steps contributed to give a new life to the foredeck area of this 33 M motor yacht.