Seastar Navetta 100’

by Gaia Yachting and Arrabito Naval Architects

In recent years, developments in yachting have seen growing interest in boats with generous space alongside better and better navigation performance. By performance, however, we mean the ability to navigate at higher speeds than a pure displacement vessel without relying on the consumption and energy needs of a planing vessel. To achieve results like this, over time naval engineering firms have proposed solutions that combine these requirements in increasingly favourable ways, but it was an Italian firm that achieved some of the most brilliant results. We’re talking about Arrabito Naval Architects, the creators of a variety of projects built by Italian shipyards, whose great strength lies in their large volumes combined with cutting-edge waterlines. The scientific approach adopted by the professionals at the Italian firm has produced keels capable of optimising hydrodynamic performance, overcoming some of the barriers that used to seem intractable. It’s no miracle, of course, but the result of research and experimentation using modern CFD calculation systems followed by tank tests over the years until the vessels produced with this technology were tested and confirmed the work done in the development phase. The fruit of all this development and the results achieved to date from Arrabito Naval Architects’ research is the new Navetta 100’ by Seastar, a 30 m yacht designed to offer the greatest possible volume with performance in line with the design plans. It is a yacht that escapes the classic parameters of pure displacement vessels of the same size – normally a top speed of 14 knots and a cruising speed of 12 knots – to offer a gross tonnage of 215 tonnes and a top speed of 18 knots, with a cruising speed of 16 knots. Of course, in order to understand the significance of what we are talking about here, it is essential to look at autonomy in relation to the capacity of the fuel tanks, which offer a total load of 14,000 litres, plus another 4,000 litres extra, for an economy cruising speed of 10 knots and a range of 3,500 miles. These numbers give us the measure of the results achieved from the scientific research and numerous tests carried out by Arrabito Naval Architects over the course of an analysis period lasting years, which has ultimately taken concrete form in successful projects now on the market. It should be added that the unusual shape of the keels developed by the Italian firm also offers outstanding seakeeping performance, alongside significantly better static stability than classic planing vessels, which is accentuated here by the effective electrical system developed by Italian firm CMC, the recipient of multiple international awards. This substantial research experience and the desire of Gaia Yachting – a specialist brokerage and service company for top-level yachting – to produce a modern navetta yacht with cutting-edge formal and functional content led to the creation of Seastar Navetta 100’, or rather the Seastar line of which the 100’ will be the first exponent. The other two models whose designs are now ready are an 86’ and a 120’, which carry the same philosophy in their DNA as we describe above for the 100’ – boats with very generous volumes and, most importantly, highly efficient hulls from a hydrodynamic point of view. It is a range of motor yachts that embodies the cornerstones of Italian excellence, the result of technological development combined with the aesthetic and functional capabilities unique to Italian production. The three models in the range will all be built in composite, as the weight component makes a significant contribution to implementing design intentions. However, that is not all, because to ensure that hulls with lengths of up to 120’ have sufficient structural rigidity and the ability to tackle even challenging seas, the quality of the materials and the structural design are critically important. Consequently, the use of unidirectional carbon fibre in the areas subject to most stress, together with systematic calculation for the finished elements with the MSC Nastran structural analysis application which Arrabito uses, are the key ingredients of the construction process. They allow for careful control of weights in line with the desire to obtain the performance that the special hull is capable of.Focusing now on the 100’, the first model of this appealing motor yacht range, it is a leisure vessel offering unusual volume for a vessel of this size, where the designers borrowed numerous habitation concept from yachts that are normally larger. These include the owner’s suite positioned in the forward section of the main deck, which enjoys substantial natural light from the windows running around the structure and an undoubtedly captivating view of the sea.

The desire to light the interiors of this yacht naturally is found in the salon as well, which in its turn has numerous windows, some of which are full height, creating a very pleasing impression of spaciousness. Speaking of the interiors, it should be noted that the choice of a near-vertical bow made it possible to increase the volume of the hull and the superstructure, but the designers still succeeded in creating a very striking private open air living space in the bow. Remaining outside, the exteriors feature the now omnipresent balcony, here to portside, which is linked to the salon through a full-height opening. In the stern, the wheelhouse has a very large width bearing in mind the 7.30 m total beam of the hull, and the relaxation area is connected directly to the salon through the salon’s large aft glass door which, even when closed, offers a pleasing sense of depth. The external layout is modern with strong lines and a balanced freeboard that develops vertically in a well-proportioned way in terms of length and width, to satisfying effect. In spite of this, the upper deck has a half deck housing the large bridge, with vertical windows offering good visibility to the horizon in all conditions. In addition, a second control station is located on the starboard side of the fly, where the hard top to aft has a glass surface which can be blacked out but allows the large aft relaxation area to be used partially in the shade or entirely in the sun. The surface of the sun deck is unusually large for a vessel of this size, especially thanks to its width but also the way that it extends to aft to cover the entire wheelhouse area. Although the forward section of the fly is continuous with the relaxation area, it is virtually separated from it by a step. Here, to starboard, we find the dining area protected above by the hard top, and to portside a sofa area with adjacent bar and access to the interior of the wheelhouse. The guest cabins are located on the lower deck, all with openings in the hull to let in abundant natural light, as well as private bathrooms, and their compartmentation can be agreed with the owner as the interior layouts developed by the shipyard offer a variety of configurations. Very large spaces have also been developed for the crew, designed to meet the legislation in force including for commercial use of the vessel, and therefore suitable for long stays on board. All personnel access routes are independent and designed to ensure that the owner and guests always have their privacy during a cruise. To conclude, in our view this is a very appealing project from both a technical and a stylistic perspective, tailored overall to finding today’s owners who are looking for an increase in space without the need to invest in larger vessels. The length of around 30 metres, achieved with a very generous volume while maintaining an aesthetic that is reliably pleasing and original, undoubtedly has the greatest appeal on the markets right now. Until we are able to experience the first hull of this stunning 100’ in person, alongside the other vessels that will join the Seastar line, we must content ourselves with the technical data and the encouraging results achieved in tank tests of this hull – results that are very interesting and once again confirm the strength of the work done by Arrabito Naval Architects to develop high efficiency keels.


Angelo Colombo

Seastar Navetta 100’ technical specifications

Lenght Overall (LMAX)30.4 m / 100’ ft
Waterline Lenght (LWL) 28.00 m / 91’86’’ ft
Max Beam (BMAX) 7.30 m / 23’95’’ ft
(fenders excluded)
Tonnage (ITC’69)about 215 GT
Max draft (Te)1.65 m / 5’41’’ ft
Fuel capacity14000 + 4000 litres / 3,698.41 + 1,056.68 US gallons
(standard + extra)
Fresh water capacity 2000 litres / 528.34 US gallons
Speed 70% fuel stop power (4)  14 knots
Speed max (4)  18 knots
(fuel stop power= 100% MCR)
Range at 70% fuel stop power> 1000 nautical miles
Range at 10 knots> 3500 nautical miles
Main engines MAN D2832LE435, rating 882 kW
Certification Rina Pleasure, LY3 MCA compliance
ArchitectureArrabito Naval Architects
Shipyard Seastar Yachts
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