Design
The design was commissioned by two experienced Class40 racers. It’s a development of 15 models
Antoine Cardin, naval architect, judel/vrolijk
The JV43 is designed to push the limit in offshore sailing for a wide range of client profiles. Using the latest developments in open sea performance and handling, the solution is very similar to a Class40 concept with a longer hull to better accommodate the necessary interior and equipment. The hull shape solution is a development from 15 comparison models, all analysed using our latest RANS Code CFD tool. The deck layout is optimised for a
short-handed crew and offers multiple seating positions and protection. The cockpit is designed around two entry doors and a central pit console, resulting in a five-winch arrangement. All lines and halyards are run back into the cockpit area so that nearly all manoeuvres are possible inside a protected space. Above deck, the rig and sailplan are optimised for offshore operation and for the IRC rating system. The aim is to reduce all possible performance gaps with the use of flying reaching sails and staysails. That setup helps to improve the boat’s behaviour in heavy sea state conditions, to keep it balanced and to reduce nose-diving. For better control and safety, the boat
is equipped with lifting twin rudders. The keel ismade out of high-strength steel with composite fairing, connected to a lead bulb at 3.0mdraught. The use of 750L water ballast divided in 3 tanks on each side allows greater performance and weight reduction for the concept. The water ballast is operated fromthe cockpit.
68 SEAHORSE
The build by Oceantec in Slovenia is a three-stage vacuuminfusion of e-glass and Corecell foamsandwich composite – like the Class40s they’ve previouslymade. After numerous offshore racing boats and customrating rules orientated builds, they opted for a three-stage Epoxy Infusion for this project. This is a proven technology of building the latest Class 40s to achieve a safe and fast hull at acceptable costs
we have complete control of what we do.’ In accordance with the clients’ racing plans the primary focus of CFD analysis was on planing conditions with wind speeds of 12kts-plus. ‘We learned in CFD
that creating a hollow in the underbody can work pretty well offshore,’ Cardin says. ‘That’s a feature you might see more of in the future. At some specific heel angles and at a certain speed the hollow creates a longer effective waterline length which makes the hull more efficient.’ The aero package was also designed
‘The primary focus is long-distance shorthanded racing’
in house. ‘We knew fromIno what types of sails we wanted to use,’ Cardin says. ‘At a later stage of the project the sailmaker came in to fine tune themid-girth, the sail area and the design of the sails within our rig geometry.We developed this again with our own sail model and validated the ratio of where we wanted
the boat to be placed within the fleet. Compared with a typical Class40 the SA:D is slightly higher. The appendage draught is the same, themast is a bit taller. But it was important for us to stay close enough to the Class40 parameters so that the
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