International A-class catamaran

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The A-Class Catamaran

The A-Class Catamaran, often abbreviated to A-Cat, is a development class sailing catamaran for singlehanded racing.[1]


The class was founded during the 1960s and was part of the 4-tier IYRU (now ISAF) approach to divide up the sports catamaran sailing scene into 4 separate groups. These A, B, C and D classes were governed by a very small set of class rules to which each design had to comply.[2] In the beginning it was just:

  • Maximum hull length
  • Maximum overall width
  • Maximum sailarea

All boats designed and built to these specs would be grouped into one fleet and race each other for crossing the finish line first.

The A-Class is the largest remaining of those 4 main classes. The B-Class quickly splintered into a score of sub classes like the Hobie 16's, Formula 18's and other classes that contain far more and far stricter class rules. The C-Class quickly developed into the really high tech and vanguard boats that were used in the Little America's Cup. These require immense investments of time and money to race. As a result, this class is extremely small but still maintains its status as the ultimate sailing catamaran designs. The D class never really got off the ground in earnest.


The official organisation for the A-Class catamaran is the IACA (International A division Catamarans Association).

The A-Class rules were expanded over time to prevent the cost of these boats from rising too high and to ensure fairness in racing.

Currently the main A-Class rules are:[3]

  • Min overall boat weight : 75 kg / 165.3 lbs
  • Max overall boat length : 5.49 m / 18.3 ft (= still the old IYRU rule)
  • Max overall boat width : 2.30 m / 7.5 ft (= still the old IYRU rule)
  • Max sail area incl. mast : 13.94 m2 / 150.0 ft2 (= still the old IYRU rule)

In handicap racing, the A-Class catamaran uses a Portsmouth Yardstick of 681 in the UK[4] or a D-PN of 64.5 in the USA.[5]

Current situation[edit]

The A-Class design has over time converged to a single sail rig using a lightweight carbon mast of about 9 meters length and using lightweight pentex or Kevlar sailcloth. The hulls and beams are often made out of carbon fibre as well. This single sail rig (just a mainsail) allows these boats to truly excel when sailing upwind. Their lightweight and time tested sailing techniques make these boats very fast on reaches and downwind legs as well. They were often unbeatable on the race course and only with the introduction of the asymmetic spinnaker on other catamarans have they lost this position a little bit.

In the decades since their foundation the A-Class has gathered a significant international following and it has class organisations in many countries around the globe. Their world championships often attracts around 100 boats and sailors. It is also a class that still contains a significant portion of homebuilders, although their numbers are decreasing with every year due to the skills required to make a competitive boat. However, nearly all A-Class sailors tinker with their setups and boats. As it is a developmental class and the rules do allow so much variation, it is paramount that a top sailor keeps experimenting with new setups and generally tries to improve the design even more. Because of this general character of the class, the A-Class is often leading over other catamaran classes in terms of design development. Over time these other classes copy new findings for their own setups. Examples of such developments are: the carbon mast, the squaretop mainsail, the wave-piercer hull design and in general the use of exotic materials.


Apart from the list below of some of the commercial builders, the A-Class catamaran can be home-built:


World Championships[edit]

Year Gold Silver Bronze
1981 Bontan Bay  Bill Anderson (AUS)
1982 Cesenatico  Alberto Babbi (ITA)
1984 Wellington  Allan Goodall (AUS)
1985 Spray Beach  Allan Goodall (AUS)
1986 Brenzone  Scott Anderson (AUS)
1987 Blairgowrie  Brad Schafferuis (AUS)
1988 Turkey Point  Greg Goodall (AUS)
1990 Napier  Greg Goodall (AUS)
1991 Grömitz  Paul McKenzie (AUS)
1992 Silvaplana  Paul McKenzie (AUS)
1993 Sanguinet  Egidio Babbi (ITA)
1994 Lake Cootharaba  Mitch Booth (AUS)
1995 Andijk  Egidio Babbi (ITA)
1996 L'Estartit  Glenn Ashby (AUS)
1997 Long Beach  Pete Melvin (USA)  Scott Anderson (AUS)  Francesco Marcolini (ITA)
1999 Port Phillip  Nils Bunkenburg (GER)  Scott Anderson (AUS)  Cameron Owen (AUS)
2000 Cesenatico  Nils Bunkenburg (GER)  Glenn Ashby (AUS)  Egidio Babbi (ITA)
2001 Castelldefels  Steven Brewin (AUS)  Glenn Ashby (AUS)  Scott Anderson (AUS)
2002 Martha's Vineyard  Glenn Ashby (AUS)  Scott Anderson (AUS)  Steven Brewin (AUS)
2004 New Plymouth  Glenn Ashby (AUS)  Scott Anderson (AUS)  Steven Brewin (AUS)
2005 Sanguinet  Pete Melvin (USA)  Glenn Ashby (AUS)  Steven Brewin (AUS)
2006 Västervik  Glenn Ashby (AUS)  Scott Anderson (AUS)  Manuel Calavia (ESP)
2007 Islamorada  Glenn Ashby (AUS)  Lars Guck (USA)  Pete Melvin (USA)
2009 Belmont (AUS)  Glenn Ashby (AUS)   ()   ()
2010 Cesenatico  Glenn Ashby (AUS)   ()   ()
2011 Århus (DEN)  Steve Brewin (AUS)  Scott Anderson (AUS)  Jack Benson (AUS)
2012 Islamorada Key  Mischa Heemskerk (NED)   ()   ()
2014 Takapuna NZL  Glenn Ashby (AUS)  Blair Tuke (NZL)  Peter Burling (NZL)
2015 (ITA)[6]  Glenn Ashby (AUS)  Mischa Heemskerk (NED)  Manuel Calavia (ESP)
2016 Medemblik (NED) [7]  Mischa Heemskerk (NED)  Darren Bundock (AUS)  Steve Brewin (AUS)
2017 Sopot (POL) [8]  Steve Brewin (AUS)  Tymoteusz Bendyk (POL)  Jakub Surowiec (POL)

Class websites[edit]

See also[edit]


  1. ^ "Archived copy". Archived from the original on 2010-03-07. Retrieved 2010-01-13.CS1 maint: archived copy as title (link)
  2. ^ "Archived copy". Archived from the original on 2010-02-21. Retrieved 2010-01-13.CS1 maint: archived copy as title (link)
  3. ^ "Archived copy". Archived from the original on 2012-04-18. Retrieved 2012-09-05.CS1 maint: archived copy as title (link)
  4. ^ "Portsmouth Number List 2012". Royal Yachting Association. Retrieved 31 July 2012.
  5. ^ "Multihull Classes". US Sailing. Archived from the original on 16 August 2012. Retrieved 30 July 2012.
  6. ^
  7. ^
  8. ^