Chevalier Taglang: MAGIC CARPET 3

LATEST OF THE 100 FOOTERS, FIRST ON THE FINISH LINE

written by Francois Chevalier
translation by Donan Raven - see http://sailingtrivia.ravenyachts.fr

As soon as she hit the water, Magic Carpet 3 took a flying start. Her designer delivered a real winner thanks to her very special lines. Whether in light airs or in a sustained breeze, she has outclassed her competitors.

Reichel/Pugh had exhaustively developed the narrow yacht with Wild Oats XI, which, throughout her career thus far, has received all possible appendages, including a canard in her original CBTF configuration.

By raising the "progressive" hard chine, the designers of Magic Carpet 3 have significantly reduced the waterline beam when the yacht is level, thus keeping the wetted surface to a minimum. As the Wally class rule forbids canting keels, Reichel/Pugh opted for a relatively large displacement, with a large quantity of the overall weight placed in the finkeel ballast. When the yacht is heeling, the hull sails on a flat surface as well as the hard chine (which provides lateral resistance) and starts to plane at the slightest of breezes. The same hull shapes can also be found on the latest generation of the Open 40 class yachts, which have proved to be more complex to optimize than their predecessors.

Wild Oats XI is a much narrower yacht than Magic Carpet 3 with a waterline beam of just 4.10m. Her lines features a slightly rounded bilge, flaring topsides, and a moulded depth positioned forward of the keel fin. When heeling, the waterline is as long as the full length of the yacht, the wetted surface is reduced, but the flaring topsides do not provide lateral resistance like more recent yachts with chine-bilged hulls like Magic Carpet 3 or Rambler 100 (Juan Kouyoumdjian design, formerly Speedboat).

The shape of Rambler 100 (formerly Speedboat, now Loyal 100) for is similar to that of a motor boat. Her hull lines are very sleek and it is difficult to read the shape of her aftersections. Because of this, her horizontal sections (which are parallel to the waterline) all stop abruptly at the transom. Generally, the beamier the vessel, the larger the developed surface of the hull and deck, incuring extra weight to the yacht. But the closer the overhead shape of the deck is to a triangle, the lesser this developed surface actually affects the hull weight and Rambler 100 is very close to a triangle. Half the yacht's weight is located in the canting keel, which is swung to windward. When the wind strengthens, 8 cubic meters of water are pumped to the windward liquid ballast tank, which provides Rambler 100 with a huge righting moment.

My 100ft Maxi Scow proposal features hull lines which are close to those of a surf board. This increases the drag in the light airs compared with a narrow yacht like Wild Oats XI, but gives her greater ability to plane in the puffs. When heeling, the wetted surface is reduced and the angle between the heading and the centerline of the yacht is smaller than on any other maxi-yacht. Furthermore, her shape stability is also greater.

A stand off between these five Maxi yachts in a New-York Bermuda, a Fastnet or Sydney-Hobart would be an educative and unforgettable spectacle.

DATA

Magic Carpet 3 / WallyCento

Designer: Reichel/Pugh
Builder: Wally, Ancona (ITA)
Build material : Carbone
Complies with the WallyCento class rule
Length of Hull: 30.48m (100ft)
Load Waterline Length: 29.49m
Beam: 7.19m
Waterline beam:4.70m
Draught: 6.20m / 4.50m
Displacement: 50 tonnes
Lifting keel
Air draught: 45.00m

Wild Oats XI
Maxi sloop
Designer: Reichel/Pugh
Builder: McConaghy's, Sydney (AUS)
Date of launch: December 2nd, 2005
Length of Hull: 30.48m (100ft)
Length Overall: 33.83m
Load Waterline Length: 29.70m
Beam: 5.40m
Waterline beam: 4.10m
Mast length: 44.10m
Draught: 5.50m
Weight: 32 tonnes
Ballast: 14 tonnes
Sail area, mainsail: 382m²
Sail area, jib: 228m²
Sail area, genoa: 505m²
Sail area, spinnaker: 880m²

Rambler 100 (now Loyal 100, formerly Speedboat)

Designer: Juan Kouyoumdjian
Builder: Cookson Boats, Auckland (NZ)
Date of launch: April 17th, 2008
Length of Hull: 29.99m
Load Waterline Length: 29.99m
Beam: 7.00m
Waterline beam: 4.95m
Draught: 5.70m
Air draught: 46.50m
Bowsprit: 3.60m
Displacement: 30.6 tonnes
Ballast: 15 tonnes
Liquid ballast tanks: 8,000 litres
Sail area, upwind: 630m²
Sail area, downwind: 1,340m²

MaxiScow 100 proposal

Designer: Francois Chevalier YD
Proposed builder: either Multiplast (France), Green Marine (UK) or Cookson Boats (NZ)
Length of Hull: 30.48m (100ft)
Load Waterline Length: 26.70m
Beam: 7.20m
Waterline beam: 5.40m
Draught: 5.60m
Displacement: 38 tonnes
Canting keel
Air draught: 46.00m
Sail area, mainsail + jib: 628m²
Sail area, mainsail + gennaker: 1,110m²

WallyCento (Projet)

Displacement: 45 tonnes

Lifted keel

Air draught: 45m

Sail area, mainsail + jib: 592m²

Sail area, mainsail + gennaker: 1,000m²

Pages

mercredi 6 novembre 2013

MAGIC CARPET 3

Aucun commentaire:

Enregistrer un commentaire