Performances and comfort /
The esTENDER hull has been defined around two concepts:
allow the mechanism to work;
be almost horizontal in navigation.
To achieve the first objective, a stepped hull was adopted, which also allowed a considerable reduction in the power used with consequent advantages from the point of view of consumption.
To achieve the second objective, it was necessary to test numerous hull shapes, each with various weight distributions: to do this we used the best computational fluid dynamics analysis software on the market; these software do not offer a statistical analysis, but solve the physical equations of the fluid and offer a result substantially similar to that obtainable from tank tests. After a few thousand hours of calculation it was possible to define the esTENDER hull with extreme accuracy.
esTENDER consists of 3 watertight compartments, each equipped with an automatic bilge pump.
The central compartment in which the extension mechanism is housed is guaranteed watertight by means of three rows of inflatable seals.
In addition to all these safety features, the boat maintains its stability and its ability to navigate even with the central compartment flooded, as evidenced by the image, the result of a stability study carried out with dedicated software.
esTENDER is the only tender to install a fixed fire-fighting system to protect the engine room. The system consists of a cylinder containing heptafluoropropane gas which inhibits the chemical reactions of combustion at the molecular level; the activation can be manual, using a handle located below the deck seat on the right, or automatic, thanks to the bulb placed above the cylinder which explodes when the temperature reaches 79 °.
It was decided to cover the entire engine room of esTENDER with a non-toxic, ecological and recyclable thermal and acoustic insulation. This choice, in addition to be unique for boats of this size, guarantees excellent acoustic comfort and no heat transfer from the engine room to the external living areas.
In the graph, the result of acoustic studies carried out by specialized companies, it can be seen that the noise perceived outside (yellow curve) coincides with the ambient noise (celestial curve) and is not increased by the noise produced in the engine room (purple curve).