Английская Википедия:IMOCA 60

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The IMOCA ("Open 60"), is a 60ft (18.288 m) development class monohull sailing yacht governed by the International Monohull Open Class Association (IMOCA). The class pinnacle event are single or two person ocean races, such as the Route du Rhum and the Vendée Globe and this has been intimately linked to design development within the class. The class is recognised by World Sailing.

Class description

The class is of "open" design, this means the boat is measurement controlled and therefore designers have freedom within the rules. Several parts including the mast, boom and the canting keel ram and fin are one design for safety reasons.

After several severe incidents in the early years of the class a self righting capability was introduced. The boats have to be able to self-right themself at any time. Every boat has to prove this capability in a 90 degree or 180 degree test.

Файл:IMOCA plan.png

Dimensions

Design restrictions include the hull length to be between 59 and Шаблон:Convert and maximum draft of Шаблон:Convert. The length including the bowsprit may not exceed 20.12 m. The max beam is 5,85 m. A maximum of four ballast tanks is allowed. Each of them has a limit in size.

Hull

The hull of the IMOCAs have typically a very wide hull compared to yachts designed for coastal races. This is supposed to give more stability in wilder sea states. The mid 2000s boats had mostly a very streamlined hull optimized to create very few turbulences, thus reducing resistance.

With the introduction of foils the stresses the hull is expected to sustain changed. For one on the points where the foils are attached, secondly the contact point between hull and waves moved further back. As a result older boats retrofitted with foils often needed also a strengthened hull. To increase performance in heavy seas scow-bows were introduced in the class. First introduced on L'Occitane these are supposed to reduce nose diving, which are lowering the average speed significantly.

Cockpit

The first IMOCAs had a fully open cockpit where winches and ship's wheel(s) were located. With progressing development the work area got more and more protected by a roof open to the back, sometimes also called cave. The ship's wheels where mostly replaced by different versions of tillers as autopilots took over more of the steering. In boats of the 2020 generation the first fully enclosed cockpits appeared, these allow the skippers to stay dry most of the time.

Rigging

The mast of IMOCAS, which is held in place by several stays is able to turn with the main sail, typically it has about 180 m². The area of the main sail can be adjusted by lowering it towards the boom, its bottom attachment. The main sail is fully battened. To improve the performance of the mainsail the gap between boom ans hull/cockpit might be closed. Charal 2 implemented this first.

In the front most boats have at least four attachment points for headsails. Three on the deck for headsails, one of these stays always on as a staysail to hold the mast in place and one attachment point on the bowsprit that is used for gennaker or spinnaker sails. The number of headsails that can be taken into a race is limited by most race regulations.

Файл:IMOCA foils and canting keel front sight.png

1: main mast; 2: spreaders; 3: keel; 4: shrouds; 5: S-foil retracted; 6: S-foil extended; 7: C-foil (like Hugo Boss 7); 8: daggerboard; 9: C-foil (like Corum)

Appendages

Two rudders as well one keel are mandatory. The keel is allowed to be tilted up to 38 degrees to either side. The rudders are not allowed to have any appendages that provide lift. Certain rudder designs like the inverted V-shape on Charal 2 are able to provide some lift.

Additionally, two more appendages are allowed. Typically these are either hydrofoils or daggerboards. Both types of appendages are typically capable to be (partially) retracted. The rake/angle of the foils can be changed up to 5 degrees.

Autopilot

All boats are equipped with autopilots that keeps the boat going constantly to allow the skippers to turn to other tasks. The autopilots uses sensors that allow them to take into account sudden variations in apparent wind, speed, load on the foils and sails. Automated obstacle avoidance, whether it is the other ships detected by radar, AIS, or obstacles detected by the OSCAR system, a system to detect unknown floating objects. The data provided by the sensors allow the autopilot to steer the boat in the best wind angle and avoid boat breaking loads.

Rule changes under discussion

Evolution of autopilot: Hydraulic control of the adjustment of the sails and the foils. For reasons of cost and maturity of technology, this track is still excluded from all the rules. However, on flying sailboats that are increasingly akin to aircraft in mechanical terms, it seems inevitable that the automated servo-controls already developed and generalized in aviation are adapted to the world of foiling boats.

T-Rudders: Elevators in the back of the boat have been discussed. The IMOCA general assembly has voted against the introduction, most recently in October 2023.

Mast: Due to the increasing loads to the mast due to foiling, changes to the one design mast are under discussion.

History

The first major sailing competition in which the Open 60s appeared was the 1986 BOC Challenge. The first boats were only limited by their length, up to 15 tons heavy and mostly constructed from aluminium.

Major milstones in the history of the IMOCA 60s:

• First Vendée Globe (1989-1990)
• 1991: International Monohull Open Class Association founded
• Introduction of canting keel 1998
• 2007: first Barcelona World Race
• 2013: one design mast and keel fin. Introduction of foils.
• 2018: creation of IMOCA Globe series
• 2023: First edition of The Ocean Race with IMOCA 60 participation.

Events

IMOCA 60 races

Name	Location	Sailing mode	Race mode	Length (nautical miles)	Limited to IMOCA 60	Cycle	First	Last	Notes
Vendée Globe	around the world	single handed	non-stop	24 000	yes	4 years	1989	ongoing
The Ocean Race	around the world	crewed	staged	varying	no	4 years	1973	ongoing
Transat Jacques Vabre	transatlantic	double handed	non-stop	varying	no	2 years	1993	ongoing
Route du Rhum	transatlantic	single handed	non-stop	3 542	no	4 years	1978	ongoing
The Transat	transatlantic	single handed	non-stop	3 750	no	4 years	1960	ongoing
Retour à la base	transatlantic	single handed	non-stop	3 500	yes	unregular	2007	ongoing
Transat New York Vendée	transatlantic	single handed	non-stop	3 600	yes	unregular	2016	ongoing
Rolex Fastnet Race	European offshore	various	non-stop	605	no	2 years	1925	ongoing
Vendée Arctic	European offshore	single handed	non-stop	1 200	yes	unregular	2020	ongoing
The Ocean Race Europe	European offshore	crewed	staged	varying	no	tbd	2021	ongoing
Guyader Bermudes 1000 Race	European offshore	various	non-stop	1 200	yes	unregular	2019	ongoing
Le Défi Azimut	European offshore	various	non-stop	500	yes	yearly	2011	ongoing
Major former races
Barcelona World Race	around the world	double handed	non-stop		yes	4 years	2007	2015
Velux 5 Oceans Race	around the world	single handed	staged	varying	no	4 years	1982	2011
Шаблон:Ill	European offshore	various	non-stop		yes	2 years	2003	2007

Other races with IMOCA 60 participation:

• Small races that where discontinued: ArMen Race, Grand Prix Guyader,
• One-time races: Monaco Globe Series, Drheam-Cup 700, Europa Warm’Up, Istanbul Europa Race, Bermudes 1000 Race - Douarnenez / Cascais, Record SNSM, Transat St Barth - Port La Forêt
• Races with little or occasional IMOCA 60 participation, mostly outside of the official IMOCA 60 race calendar: Round Britain & Ireland Race, Giraglia Rolex Race, Sydney to Hobart Yacht Race, Transat Québec - Saint-Malo, Newport Bermuda Race

See also

• Open 50
• International Monohull Open Class Association (IMOCA)
• Vendée Globe

External links

• Шаблон:Official website