Clockwise from top left: the Lombard Class40 Carac reaches away from Ireland in the Normandy Channel Race; dramatic forward sections on Lombard’s latest proto Mini 6.50 design No945 which won the 2018 Mini Fastnet shortly after going afloat for the first time; a bow-on view illustrates how Lombard’s chine may be easier on the water as it is pushed aside with less ‘reverse push’ than results from the disturbance of a conventional bluff scow (left); no950 shows off the flat run aft that is more easily achieved with the use of a chine as Imoca-style vertical topsides allow the flat planing surface to mirror max beam at the transom – as well as the probability of less spray drag than when using more traditional curved aft sections
tuning compared with the more common two-spreader configurations. The first single-spreader Class40 mast
was built by Axxon for Lift40 n°1, Carac. We expect that this configuration will soon become standard for other new boats.
by the use of a larger hull than by the dramatic differences between the Mini Proto and the Class40 in rigs and appendages. The Class40 emphasis is on offshore and
coastal courses and so the driver with our new design was simple: being the fastest boat on the water when reaching in medium to strong breeze… and ideally no slower elsewhere. We believe that we managed it! In the
2018 Normandy Channel Race (issue 461), raced mostly in light-air upwind/downwind VMG conditions, Carac, Lift40 n°1, fin- ished just six seconds behind the winning Mach40 V2, a design that remains a proven light-airs benchmark. So far so good.
52 SEAHORSE
Open class mast and rigging Our office has always treated mast and rigging design as an integral performance factor and for many years we have been actively involved in rig development with successful manufacturers like Lorima and Axxon. In the open classes, over the past 10 years the cathedral rig with fewer spreaders and extra diagonals has been one of the signatures of this office and it has delivered consistently positive results for us. These developments are ongoing…
Class40 Our designs now feature a single pair of spreaders for improved aerodynamics, lower centre of gravity and much simplified
Mini 6.50 A new optimised mast section was specifi- cally developed for our new Minis to accommodate their increasing righting moment, especially when foiling. The tube stiffness was also tailored to cope with our more demanding single-spreader geometry, as well as to permit easy rake adjustment (with up to 10° of freedom). The result is a slightly larger section but a lighter, stiffer mast overall. Aero is also improved thanks to the use of a large topmast taper and a more sophisticated aerodynamic section.
IRC (Ofcet 32) In addition to VCG and aero advantages, in the case of a yacht racing under IRC reducing the number of spreaders offers a significant reduction in rating; in some instances a single-spreader high-modulus carbon mast now offers a lower rating than a conventional two-spreader aluminium spar! Progress is good!! Eric Levet and Marc Lombard Marc Lombard Yacht Design Group q
CHRISTOPHE BRESCHI
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