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post #4443 of Old 05-31-2013 Thread Starter
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Akilaria RC3

[quote=G1000;1037733]How about Akilaria RC3 for this beauty pageant

Looking at it we would say it is the same designer. It is not, this one is a Marc Lombard design. It only shows they are all going along the same path in what regards hull/transom design and low free-board. Marc Lombard makes some very interesting comments about that path and the boat performance:

"The Akilaria 40 RC3 is a completely new boat.*The design is based on the background provided by the previous Akilarias RC1 and RC2, but the hull, deck, appendages, mast and interior have been redesigned.*The objective is to provide a fully optimised boat regarding the current Class 40 rules and race program.*This includes the Global Ocean Race, for which the ISAF Category 0 is required.

Hull optimization was carried out using numerical simulation tools.*Various cases were studied, varying heel and leeway angles, speeds, water ballast and sail configurations.*The starting point of the design was to match the performance of RC2 downwind in light to medium winds.*The RC2 is indeed among the fastest in those conditions.*This constraint sets maximum values in terms of waterline beam, transom immersion and volume of the forward part of the hull."

"The forward freeboard is slightly increased in comparison to the RC2 to enhance water deflection.*The aft freeboard is reduced in order to keep a
mean freeboard close to the minimum allowed by the rule.*A large 45 degrees
chamfer on the sheer line is designed in order to further reduce the apparent
stability during the 90 degrees stability test.*In the class 40 rule, a low freeboard is essential for optimal performance.*Indeed, the test limiting the stability is performed at 90 degrees of heel.*

At this extreme heel angle, the lower the freeboard, the lower the center of gravity can be shifted for the same measured stability. A lower CG provides higher stability at conventional sailing heel angles and a better dynamic behavior.*A boat providing the “minimum weight and maximum stiffness, measured by the rule” but not the minimum freeboard is therefore not optimum."

Originally Posted by MrPelicano View Post
... These new generation Class 40 boats are the Bugatti Veyrons of yacht racing, IMHO.
Not really they are a lot more amazing: That would be only true if you could buy a Bugatti Veyron for the price of a Mercedes or BMW sedan...and the Bugatti costs 10 times more.

These 40class racers cost less than a 40ft Halberg-Rassy. That is only possible because the rule is designed to allow for inexpensive racers with a top speed potential. Very expensive materials, including Carbon are forbidden, except on the masts and spars.



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Last edited by PCP; 05-31-2013 at 02:36 PM.
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