Donan.
http://sailingtrivia.ravenyachts.fr/
moving...
Dear readers, please note that Sailing Trivia has migrated to a new URL. More classics and moderns to follow shortly.
Donan.
http://sailingtrivia.ravenyachts.fr/
Donan.
http://sailingtrivia.ravenyachts.fr/
WallyCento and MaxiScow - a new concept
Publishing naval architect François Chevalier's original design for an out-and-out racer immediately reveals a great blend of today's most generalised trends for breaking speed limits as well as displays the author's great ability to look into the breadth of working concepts in yachting history and formalise a proposal that could establish herself as a capable prize winner, advocating the scow bow as tomorrow's cornerstone in building racing yachts. Mr. Chevalier writes:
Figure 1: The two MScow projects (overture): sailplans for WallyCento and Maxi Scow
I had had early etchings for these two 100ft sailing yachts, which I named MScow, laying on my draftboard since last summer, together with a Volvo Open 70 and an IMOCA Open 60. When the Volvo Ocean Race announced that future editions would use a one-design, I decided to finalise the two 100ft projects: a WallyCento and a Maxi Scow.
Figure 2: WallyCento, lines, sections, profile and half-deck
Figure 4: WallyCento, interior layout
The reason to design yet another Wally lies in the designation of the WallyCento rule itself: owners remain keen on the combination of comfort, performance, modern design and bleeding edge technology in a yacht. Even if the WallyCento open box rule forbids canting keels and includes a minimum displacement figure, she remains true to the Wally essence which has begot its prestigious fleet: simple handling, automated sailing systems, utterly flush decks, light and minimalist interior spaces.
Figure 5: Maxi Scow, lines, sections, profile and half-deck
Figure 7: MaxiScow, interior layout
The "Record" designation of the Maxi Scow version, which features a more lightweight displacement and a canting keel, rid of all the modcons and automation usually presented in Wallys, targets ocean records and line honours in crewed races such as the Newport-Bermuda, the Fastnet or the Sydney-Hobart.
As featured in the wetted surface diagrams comparing the MScow concept with conventional monohulls when heeling, the key advantage of the MScow is her underbody, which under a heel sails at an angle which would be three times smaller than a conventional yacht. On the one hand, the righting moment is a lot more efficient, whether or not she is fitted with a canting keel, and on the other hand, the keel remains in the centerline under sail: The result is the MSow's better ability in pointing to windward, by one or two degrees depending on configuration.
To improve the sailing platform's performance, the bowsprit can be orientated and the tack of headsails can be adjusted in the lateral plane.
Figure 8: WallyCento and Maxi Scow compared with conventional 100-footer
On a level plane, the lines of the WallyCento and Maxi Scow are reminiscent of a windsurfing board.
On a heel, the angle of the wetted line with the centerline is a third of that of a conventional racing 100-footer.
As far back as the 1970s, I made a concept for a crossoceanic windsurf designated for a double-handed Transatlantic race. As for many projects of this kind, the model is still hanging on my office wall. The idea remerged ten years ago when I wrote an article investigating the origins of planing hulls. The craze which governed the American skimming dishes at the turn of the twentieth century, with waterline length as the only limitation, had given me the idea to develop an IMOCA Open 60 for the Vendée Globe single-handed circumnavigation race.
I decided to develop a progressive chine-bilged scow, and instead of a pram bow, I proceeded to cut away the stem very significantly to avoid wave slamming as much as possible. By tapering the bow both in height and in width, shocks with head waves are dampened significantly and the scow skims the surface immediately and displaces as little water as possible.
François Chevalier, August 4th, 2012
I had had early etchings for these two 100ft sailing yachts, which I named MScow, laying on my draftboard since last summer, together with a Volvo Open 70 and an IMOCA Open 60. When the Volvo Ocean Race announced that future editions would use a one-design, I decided to finalise the two 100ft projects: a WallyCento and a Maxi Scow.
The reason to design yet another Wally lies in the designation of the WallyCento rule itself: owners remain keen on the combination of comfort, performance, modern design and bleeding edge technology in a yacht. Even if the WallyCento open box rule forbids canting keels and includes a minimum displacement figure, she remains true to the Wally essence which has begot its prestigious fleet: simple handling, automated sailing systems, utterly flush decks, light and minimalist interior spaces.
The "Record" designation of the Maxi Scow version, which features a more lightweight displacement and a canting keel, rid of all the modcons and automation usually presented in Wallys, targets ocean records and line honours in crewed races such as the Newport-Bermuda, the Fastnet or the Sydney-Hobart.
As featured in the wetted surface diagrams comparing the MScow concept with conventional monohulls when heeling, the key advantage of the MScow is her underbody, which under a heel sails at an angle which would be three times smaller than a conventional yacht. On the one hand, the righting moment is a lot more efficient, whether or not she is fitted with a canting keel, and on the other hand, the keel remains in the centerline under sail: The result is the MSow's better ability in pointing to windward, by one or two degrees depending on configuration.
To improve the sailing platform's performance, the bowsprit can be orientated and the tack of headsails can be adjusted in the lateral plane.
On a level plane, the lines of the WallyCento and Maxi Scow are reminiscent of a windsurfing board.
On a heel, the angle of the wetted line with the centerline is a third of that of a conventional racing 100-footer.
As far back as the 1970s, I made a concept for a crossoceanic windsurf designated for a double-handed Transatlantic race. As for many projects of this kind, the model is still hanging on my office wall. The idea remerged ten years ago when I wrote an article investigating the origins of planing hulls. The craze which governed the American skimming dishes at the turn of the twentieth century, with waterline length as the only limitation, had given me the idea to develop an IMOCA Open 60 for the Vendée Globe single-handed circumnavigation race.
I decided to develop a progressive chine-bilged scow, and instead of a pram bow, I proceeded to cut away the stem very significantly to avoid wave slamming as much as possible. By tapering the bow both in height and in width, shocks with head waves are dampened significantly and the scow skims the surface immediately and displaces as little water as possible.
François Chevalier, August 4th, 2012
| specifications | WallyCento | Maxi Scow |
| naval architecture | Francois Chevalier YD | Francois Chevalier YD |
| build | carbonfiber, built to WallyCento open rule | carbonfiber |
| shipyard | the yachts can be built at Multiplast (France), Green Marine (UK) or Cookson Boats (New Zealand). | |
| Length Over All | 100ft (30.48m) | 100ft (30.48m) |
| Load Waterline Length | 87ft 7 in (26.70m) | 87ft 7 in (26.70m) |
| beam | 23ft 7in (7.20m) | 23ft 7in (7.20m) |
| draught | maximum 20ft 4in (6.20m), minimum 14ft 9in (4.50m), dropkeel | 18ft 4in (4.50m) canting keel |
| displacement | 45 tonnes | 38 tonnes |
| air draught | 147ft 8in (45m) | 150ft 11in (46m) |
| mainsail + jib area | 6,370sqft (592m²) | 6,760sqft (628m²) |
| mainsail + gennaker area | 11,000sqft (1000m²) | 11,900sqft (1110m²) |
the design for the Volvo Ocean Race 2014-2015, 2017-2018
As presented today by Volvo Ocean Race CEO Knut Frostad at the Lorient stopover, the current trend of Volvo Open 70 box rule boats has given incentive to drive costs upward in the teams' bids to win the trophy, resulting in a decreasing number of boats taking part in the race. To achieve sustainability for the future of the race, a greater number of teams must take part, therefore the race organisers have taken steps to control costs, resulting in the requirement for a one-design/one-builder. Bruce Farr & Associates have designed yachts for every Whitbread Round the World Race and Volvo Ocean Race since 1981, have won four of them, but have lost all the Volvo Open 70 box rule editions to yacht designer Juan Kouyoumdjian. Despite the latter's commitment to the Artemis Racing team design for their 72ft America's Cup wingsailed catamarans, it is surprising that he was not even called to tender a proposal for the new Volvo design, which has been awarded instead to Farr Yacht Design. The design remains a canting keel monohull, slightly smaller in length but with a distinctive wave-piercing bow, reverse sheer, a higher aspect rig, deeper appendages, and a larger coachroof with two companionways. Details below:
all graphics courtesy of © Farr Yacht Design
| VOLVO OPEN 70 box rule 2005-2012 | Farr 65 one-design VOLVO 2014-2018 | |
|---|---|---|
| naval architecture | multiple designers: Farr Yacht Design, Juan Kouyoumdjian, Marcelino Botin, John Reichel/Jim Pugh, Rob Humphreys | one designer: Farr Yacht Design |
| shipyards | multiple builders: Killian Bushe, McConaghy Boats, Goetz Custom Boats, Green Marine, King Marine, Southern Ocean Marine, New England Boatworks, Cookson Boatworks, Multiplast, Persico, ML Boatworks, Hart Marine, Boatspeed | one builder: a consortium of Persico, Multiplast and Decision building parts for assembly by Green Marine |
| Length Over All | 21.95m (72ft) | |
| Length of Hull | 21.50m (70ft) | 20.40m (67ft) |
| Length On Deck | 19.80m (65ft) | |
| beam | 5.70m (18.7ft) | 5.60m (18.4ft) |
| draught | 4.50m (14.8ft) | 4.70m (15.4ft) |
| keel | 40° canting | 40° canting |
| weight | 14,000kg—14,500kg | 10,750kg |
| bowsprit length | 1.82m (6ft) | 2.15m (7ft) |
| mast length | 31.50m (103.3ft) | 30.30m (99.40ft) |
| rig arrangement | keel-stepped mast, checkstays and running backstays | deck-stepped mast, two backstays |
| freeboard amidships | 1.60m (5.2ft) | 1.72m (5.6ft) |
| mainsail area | 175m² (1,884sqft) | 151m² (1625sqft) |
| working headsail area | 200m² (2,153sqft) | 135m² (1453sqft) permanently hoisted jib |
| upwind sail area | 451m² (4855sqft), mainsail + masthead Code 0 | |
| downwind sail area | 550m² (5920sqft), mainsail + A3 | |
| number of sails | 10 (including stormsail) | 7 (including stormsail) |
| liquid ballast tanks | 1×1,600L after the aft bulkhead | 1×1,000L forward of the mast 2×800L aft under the cockpit and adjacent to the transom |
| crew | 10 + 1 media crew member | male: 8 + 1 media crew member female: 10 + 1 media crew member |
| shore support | team-specific | shared and pooled |
| communications | Inmarsat Fleet Broadband FB500 (432kbps) | Inmarsat Global Express (50mbps, projected) |
all graphics courtesy of © Farr Yacht DesignGroupama 4 hauling it down to Lorient.
that's it, with a projected 23-point lead on the overall scoreboard, I think that we have the winner of the 2011-2012 Volvo Ocean Race. Here is Groupama 4 racing the final 20NM in the eighth leg to the city of Lorient.
all photographs courtesy of © Paul Todd
Subscribe to:
Posts (Atom)