Ferretti technology: the Fer.Wey Hull
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Donnerstag, 10. Juli 2008
Throughout its history Ferretti has always been committed in the development of highly innovative products, with constant investment in technological research leading to the creation of cutting edge solutions that combine comfort, elegance and respect for the environment. Electrical energy savings are a the particular focus ofFerretti’s AYT (Advanced Yacht Technology), one of the world’s most advanced naval technology and design centres, in the development of a highly innovative hull that will offer Ferretti owners a new way of experiencing the sea.
The FER.WEY (Ferretti Wave Efficient Yacht) hull, the result of years of research and development by AYT, is a revolutionary type of hull, described as‘transplaning’, which enables owners to cruise with great comfort and efficiency in the intermediate speed range where both planing and displacement hulls generally behave in an abnormal way. At the same time the hull greatly reduces the rolling effect and guarantees low aft wave turbulence.
The FER.WEY transplaning hull allows this craft – tested by Ferretti in the Potsdam naval test tank after studies at the CFD (Computational Fluid Dynamics) – to pass the 15 - 16 knot level gradually with a perfectly horizontal attitude, reaching 20 knots. A craft of this size would normally enter the planing hump at around 13 - 14 knots, already assuming a stern-down attitude at 12 knots.
What’s more, in contrast to a classic displacement hull, where resistance rises dramatically with the longitudinal attitude when nearing critical speed, the FER.WEYhull’s resistance rises less drastically as speed increases. Another significant feature is that this hull does not reach a definite ‘hump speed’, a performance need experienced by planing craft.
As a result, the FER.WEY hull offers owners:
• A stable longitudinal attitude, allowing owners to move around the craft in comfort, experiencing no marked change in attitude as speed varies.
• Maximum cruising efficiency up to 16 knots, a feature provided by the action of the prominent bow bulb, which cuts wave drag on the hull.
• Significant reduction in rolling.
Finally, the special shape of the FER.WEY hull allows the craft to rest on the sea bottom while protecting the propellers from impact damage, and allows owners to access areas that would be a risky proposition for other types of hull.