View source for 2.4 Metre

{{Infobox Sailboat Specifications
|image         = Heiko_Kroeger_24mR.jpg
|caption       = International 2.4mR
|class_symbol  = [[Image:2.4mR black.svg|120x60px]]
|crew          = 1
|loa           = {{convert|4.16|m|ftin|abbr=on}} <small>(Mark III)</small>
|loh           = 
|design = Development class
|lwl           = 
|beam          = {{convert|0.805|m|abbr=on}}
|draft         = {{convert|1|m|3|in|abbr=on|sigfig=2}} <small>(Mark III)</small>
|hull          = {{convert|260|kg|abbr=on}}
|mastheight    = {{convert|4.65|m|abbr=on}}
|mainsailandjib= {{convert|7.5|m2|abbr=on}} <small>(Mark III)</small>
|mainsail      = 
|jib           = 
|spinnaker     = 
|d-pn          = 
|rya-pn        = 1250<ref name="RYA2012">{{cite web |url=http://www.rya.org.uk/SiteCollectionDocuments/technical/Web%20Documents/py-general/2012%20listv3.xls |title=Portsmouth Number List 2012 |publisher=Royal Yachting Association |accessdate=31 July 2012}}</ref>
|phrf          = 
|updated       = 15 August 2009<ref name="specs"/><ref name="mark">{{cite web |url=http://www.gaviayachts.com/options-prices.htm |title=The Norlin Mark III, ''International 2.4mR Class'' |publisher=GaviaYachts.com}}</ref>
|olympic       = para
}}
The '''International 2.4mR''' is a one-person [[keelboat]]. The class is a development class governed by the 2.4mR rule. The rule is controlled by [[International Sailing Federation|World Sailing]] (ISAF) since it is one of few classes designated as an International class. The class rule is closely related to the 12mR rule that was used in the America's Cup and the shape often resembles the larger sister.

While there is a small but active group of amateur designer/builders around the world, around 90% of boats are the commercially produced Norlin Mark III designed by yacht designer [[Peter Norlin]] of [[Sweden]]. Recently, new designs have come into production, such as the Stradivari III and the Proton.

The boat is primarily used for racing and the class holds highly competitive national events in many countries. World and European championships (only when the World Championship is not in Europe) are attracting around 100 boats every year. In some countries it features mainly as a class for sailors with a disability.

The 2.4mR is ideal for adapted [[sailing]] since the sailor does not move in the boat, and everything is adjustable from right in front of the sailor. Both hand-steering and foot-steering are possible. The boat's ability in integrated sailing has been proven on the result lists of several World Championships. In 2002 and 2005 there were handicapped World Champions. The boat is sailed without a [[spinnaker]], but with a whisker-pole for the [[jib]].

==History==
After the 1980 [[America's Cup]], people in the Newport, RI area started sailing boats called '''Mini-12s''' named for the [[12-meter class|12-Metre]] yachts used in the America's Cup. As the class developed, word of it spread to Sweden, home of yacht designer [[Peter Norlin]]. Norlin tweaked the design, and along with other [[naval architect]]s he created the 2.4 meter yacht class. Although the 2.4mR is a [[construction class]], Peter Norlin is in practice the totally dominating designer, and the class is therefore often mistaken as a one design class. In addition to all the sailing aspects of the boat, Norlin has worked the design to incorporate features for the physically disabled to use the boat.

==One-design==
In recent years an attempts have been made to develop a one design class based on the Norlin III. This is primarily because of the need for competition within the paralympics for racing to be about the sailor and not a technical development race. This led to the introduction of (Appendix K to the Class rules) and now a group is working on a set of stand alone One-design rules. This is still at the early stages but it is likely a new one design class is formed alongside the development class.

==Rating formula==
As an open class rather than a one-design, all boat designs must meet the following formula.<ref name="specs">{{cite web |url=http://www.inter24metre.org/links/CurrentClassRules.pdf |title=International 2.4 mR Class Rules (2006) |format=PDF |publisher=Inter24metre.org|author=Marie <!-- BOT GENERATED AUTHOR -->|archiveurl=http://www.webcitation.org/5jCxHmZsn|archivedate=2009-08-21|deadurl=no|accessdate=2009-08-16}}</ref>

<math>R = \dfrac{L + 2d - F + \sqrt{S}}{2.37}</math>

Where (all measurements in mm)
* L = the "corrected" length of the hull (see rule D.6.3)
* d = the midship girth difference (see rule D.6.4)
* F = the average freeboard height (see rule D.6.5)
* S = the total rated area of the mainsail and jib combined.

==Events==

===World Championships===

{| {{MedalistTable|type=Year}}
|-
| 1993 [[Kokkola]]
|{{flagathlete|[[Patrik Forsgren]]|SWE}}
|{{flagathlete|[[Peter Norlin]]|SWE}}
|{{flagathlete|[[Ralf Casen]]|FIN}}
|-
| 1994 [[Rutland Water]]
|{{flagathlete|[[Bo Hedensjö]]|SWE}}
|{{flagathlete|[[Carl-Gustaf Fresk]]|SWE}}
| 
|-
| 1995 [[Aahus]]
|{{flagathlete|[[Carl-Gustaf Fresk]]|SWE}}
|{{flagathlete|[[Marko Dahlberg]]|FIN}}
| 
|-
| 1996 [[Cannes]]
|{{flagathlete|[[Peter Norlin]]|SWE}}
|{{flagathlete|[[Bo Hedensjö]]|SWE}}
|{{flagathlete|[[Imma Björndahl]]|FIN}}
|-
| 1997
|{{flagathlete|[[Marko Dahlberg]]|FIN}}
|{{flagathlete|[[Peter Norlin]]|SWE}}
|{{flagathlete|[[Patrik Forsgren]]|SWE}}
|-
| 1998 [[Tampere]]
|{{flagathlete|[[Rikard Bjurström]]|FIN}}
|
|
|-
| 1999
|{{flagathlete|[[Tom Björndahl]]|FIN}}
|{{flagathlete|[[Marko Dahlberg]]|FIN}}
|{{flagathlete|[[Peter Norlin]]|SWE}}
|-
| 2000 [[Melbourne]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Rikard Bjurström]]|FIN}}
|{{flagathlete|[[Peter Norlin]]|SWE}}
|-
| 2001 [[Tønsberg]]
|{{flagathlete|[[Heiko Kroeger]]|GER}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Peter Norlin]]|SWE}}
|-
| 2002 [[Miami]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Hans Meyers]]|USA}}
|{{flagathlete|[[Tom Brown (sailor)|Tom Brown]]|USA}}
|-
| 2003
|{{flagathlete|[[Marko Dahlberg]]|FIN}}
|{{flagathlete|[[Damien Seguin]]|FRA}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|-
| 2004
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Ulf Arvidsson]]|SWE}}
|
|-
| 2005
|{{flagathlete|[[Nick Scandone]]|USA}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Helena Lucas]]|GBR}}
|-
| 2006 [[Helsinki]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Thierry Schmitter]]|NED}}
|{{flagathlete|[[Harri Malm]]|FIN}}
| 
|-
| 2007 [[Kolding]]
|{{flagathlete|[[Lennart Heselius]]|SWE}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Ulf Arvidsson]]|SWE}}
|-
| 2008 [[Gran Canaria]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Damien Seguin]]|FRA}}
|{{flagathlete|[[Hans Asklund]]|SWE}}
|-
| 2009 [[Fort Myers]]
|{{flagathlete|[[John Ruf]]|USA}}
|{{flagathlete|[[Carl Horrocks]]|USA}}
|{{flagathlete|[[Paul Tingley]]|CAN}}
|-
| 2010 [[Hoorn]]
|{{flagathlete|[[Paul Tingley]]|CAN}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Hans Asklund]]|SWE}}
|-
| 2011 [[Ålesund]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Marko Dahlberg]]|FIN}}
|{{flagathlete|[[Rikard Bjurström]]|FIN}}
|-
| {{nowrap|2012 [[Porto San Giorgio]]}}
|{{flagathlete|[[Peter Andersson (sailor)|Peter Andersson]]|SWE}}
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Megan Pascoe]]|GBR}}
|-
| 2013 [[Poole]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Helena Lucas]]|GBR}}
|{{flagathlete|[[Megan Pascoe]]|GBR}}
|-
| 2014 [[Toronto]]
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Bjørnar Erikstad]]|NOR}}
|{{flagathlete|[[Helena Lucas]]|GBR}}
|-
| 2015 Rauma
|{{flagathlete|[[Stellan Berlin]]|SWE}}
|{{flagathlete|[[Bjørnar Erikstad]]|NOR}}
|{{flagathlete|[[Heiko Kröger]]|GER}}
|-
| 2016 [[Hobart]]
|{{flagathlete|[[Megan Pascoe]]|GBR}}
|{{flagathlete|[[Matthew Bugg|Matt Bugg]]|AUS}}
|{{flagathlete|[[Paul Francis (sailor)|Paul Francis]]|NZL}}
|}

===Disabled World Championships===
The 2.4 metre has been used a number of times as equipment for the One-Person Technical Disabled displine which holds an annual World Championships.

===Paralympics===
{{see also|Sailing at the Summer Paralympics}}
Since 2000 the 2.4 Metre has been the official single-crew class boat for [[sailing at the Summer Paralympics]] although it has been used in a more one design form utilising the Norlin Mk3 design.

==References==
<references/>

== External links ==
{{Commons category|2.4 Metre (keelboat)}}
* [http://www.inter24metre.org/ International Class Association]
* [http://origin.sailing.org/classesandequipment/24M#skiptomain 2.4 Metre] at International Sailing Federation (ISAF)
* [http://www.sailing.org/  World Sailing Homepage]
* [http://www.ukassociation2-4mr.co.uk/ UK Class Association]
* [http://www.us24meter.org/ US Class Page]
* [http://www.2point4.racing/ Hong Kong 2.4 Metre Class Association]
* [http://www.24mr.se/ Design & Construction web site]
* [http://chargercomposites.com/sail/charger-2-4/#access Charger 2.4] at Charger Technology

{{Paralympic Games Sailing}}
{{International Sailing Federation Classes}}

[[Category:Classes of World Sailing]]
[[Category:Keelboats]]
[[Category:Development sailing classes]]
[[Category:World championships in sailing]]