REPAIRED WING ORACLE AC72, NZ CORE BUILDERS COMPOSITES, WINGSAIL, CATAMARAN, AMERICA'S CUP, AC72, AC 72, WING,

SEASONS GREETINGS FROM FRANCOIS AND JACQUES

THE REPAIRED WING OF THE ORACLE AC72

©François Chevalier 2013

NZ Core Builders Composites has sent the wing of the second Oracle catamaran, which set off from Auckland enroute to San Francisco on Christmas!  It will get new flaps and be fitted on the restored cat that will be re-launched next February.

If the hulls of the catamaran appear to have some shortcomings – very narrow forward profiles and lack of transverse stiffness – their aerodynamics and finishes are particularly successful.

With respect to this wing – its thickness, simplicity, flexibility, form and profile – improvements can be seen.

Oracle Team USA’s second cat – with new wing and hulls – is well under construction. We will certainly make a comparative analysis when they are revealed!

MEILLEURS VŒUX 2013 DE FRANCOIS CHEVALIER & JACQUES TAGLANG

L’AILE DE L’AC72 D’ORACLE RÉPARÉE

©François Chevalier 2013

Le chantier néo-zélandais Core Builders Composites a reconstruit l’aile du futur defender de l’America’s Cup et a pris la route pour San Francisco à bord d’un cargo ce Noel!

Elle recevra de nouveaux volets et retrouvera le catamaran réparé et remis à flot début février 2013.

Si les coques du catamaran présentaient quelques lacunes - trop de finesse sur l’avant et manque de raidisseurs transversaux - l’aérodynamique et les finitions étaient particulièrement réussies.

En ce qui concerne cette aile, la finesse, la simplicité, la souplesse, la forme et les profils sont ce qui se fait actuellement de mieux.

Le second bateau, aile et coques sont déjà en construction. Nous ne manquerons pas de vous faire une analyse comparative.

ROLEX SYDNEY HOBART YACHT RACE 2012, WILD OATS XI, WILD OATS XI DESIGN, SYDNEY HOBART 2012 WINNER, REICHEL-PUGH, RAMBLER, PILGRIM, JUBILEE, JUAN K, STEWART & BINNEY, JOHN PAINE, AMERICA' CUP 1893

WILD OATS XI… ROLEX SYDNEY HOBART YACHT RACE 2012 WILD OATS XI: Sixth victory in the Sydney Hobart yacht race and new record!

There is an old French adage that says the best soups are made in the oldest pans...
 Re-launched three weeks prior the Sydney-Hobart yacht race 2012, Wild Oats XI has again become the undisputed winner!

It is interesting to see what kind of change its designers Reichel/Pugh have made particularly on its appendages. In 2011 Investec Loyal (ex-Maximus & then now Ragamuffin Loyal) – a 2005 Greg Elliott’s design – defeated it by 2 minutes and 48 seconds but Wild Oats XI wins again this year, on elapsed and corrected time!

Rolex/Carlo Borlenghi 2012 - Wild Oats XI

Note that the second, Ragamuffin Loyal ex-Investec Loyal, dates from 2005 and the third one Lahan (ex-Konica Minolta & Zana) is a 99-foot designed in 2003 by the New-Zealander Brett Bakewell-White – recently optimized for the IRC, a light displacement, fixed keel and reduced draft (4,33 m).

Note that this year the second, Ragamuffin Loyal ex-Investec Loyal, dates from 2005 and the third one Lahan (ex-Konica Minolta & Zana) is a 99-foot designed in 2003 by the New-Zealander Brett Bakewell-White – recently optimized for the IRC, a light displacement with a fixed keel and reduced draft (4,33 m).

Redrawn from many photos, the lines plan shows a hull with slightly rounded bilges, with flaring sides, a narrow waterline (4,10 m) and a depth hull positioned forward the keel. When heeling the waterline uses all the boat length; the wetted surface is reduced but the flaring sides do not have the anti-drift fins role as it happens with more recent hull shapes with hard-chine as Farr’s ICAP Leopard or Juan K’s Rambler 100.

Added in 2012 the forward daggerboard with its thick profile aims to correct the instability when luffing-up or bearing-off on the crest of the waves when downwind sailing. Indeed, with these long light displacements stretched with imposing bowsprits, the downwind sails shift the center of the sail plan far forward. This tends the boat to be slack.

The improvements to the structure and all the boat have allowed saving weight that has been put in the keel.

The vertical winglets behind the bulb replace the classic winglets in an innovative way. The small flat part on the back generates two eddies that are scattered by theses winglets. More! These two wings generate a stabilizing anti-drift fins when the keel is canted to windward.

Between 2007 and 2008, Wild Oats XI was fitted with its two daggerboards forward the mast, sloped by some ten degrees, that corrects the tendency to slide on its upper-works when heeling.

In 2005 Wild Oats XI was a development of Wild Oats IX, a 60-foot launched in 2002 and record holder of the 2003 Sydney-Hobart race, fitted with the same appendages – canting keel and two rudders one as a canard.

Back to the future...

Pilgrim had been designed by Steward & Binney – successors of Edward Burgess three times winner of the America’s Cup in 1885, 1886, 1887 – was a pure steel bulb keel boat fitted with a forward daggerboard.

©François Chevalier - Pilgrim 1893 - Lines and sail plan

Jubilee, drawn by John Paine, was a bulb keel yacht fitted with a complementary daggerboard under the ballast of the keel, an innovation taken up on the first Wally, Wallygator, and a forward daggerboard.

©François Chevalier - Jubilee 1893 - Lines and sail plan

BOATS DATA

Wild Oats XI

Maxi

Sloop

Designer: Reichel/Pugh

Builder: McConaghy, Sydney

Launching date: December 2, 2005

L.O.D.: 30.48 m

L.O.A.: 33.83 m

L.W.L.: 29.70 m

Beam: 5.40 m

Mast height: 44.10 m

Draft: 5.50 m

Displacement: 32 t

Ballast: 14 t

Mainsail area: 382 m²

Jib area: 228 m²

Genoa area: 505 m²

Big spinnaker area: 880 m²

Rambler 100 (ex-Speedboat)

Designer: Juan Kouyoumdjian


Builder: Cookson Boat, Auckland (N-Z)


Launching date: April 17, 2008


L.O.A.: 29.99 m

L.W.L.: 29.99 m


Beam: 7 m


Draft: 5.70 m


Air draught: 46.50 m


Bowsprit: 3.60 m


Displacement: 30,6 tons


Ballast: 15 tons


Additional ballast: 8 tons

Sail area (upwind): 630 m²


Sail area (downwind): 1.340 m²

Pilgrim


Unsuccessful defender candidate in the America’s Cup 1893

Designer: Steward & Binney

Builder: Pusey & Jones

Launching date: June 12, 1893

L.O.A: 37.15 m

Beam: 6.96 m


Draft: 6.70 m

Displacement: 90 t

Ballast: 16 t

Sail area (upwind): 953 m²

Jubilee

Unsuccessful defender candidate in the America’s Cup 1893

Designer: John B. Paine

Builder: George Lawley & Son

Launching date: June14, 1893

L.O.A.: 38.18 m

Beam: 6.90 m

Draft: 4.25 / 6.40 m

Displacement: 95 t

Ballast: 25 t

Sail area (upwind): 1063 m²