Sportsboat

The term sportsboat first appeared in the late 1980s and early 1990s to describe high performance trailer yachts with major compromises in accommodation and weight compared to traditional designs of the same size.

They tend to be characterised by historically large sail areas for a given length (especially under downwind sails), light weight construction and a heavy reliance on crew weight to counterbalance heeling forces. They usually feature lifting keels (for easy trailerability) of a modern fin and bulb design and planing hull designs. Most sportsboats are self-righting as opposed to skiffs.

As similar design philosophies spread into larger classes the length of most sportsboats has come to be considered as between 5.5m and 8m (18'-26'). Boats of a similar design but of larger size have come to be known as sports yachts and are generally in the size range of 9m - 12m.

Rig design and sail plan

Sportboats are generally characterised by a tall mast for their hull length, a correspondingly large main sail and non-overlapping jib (a headsail that does not extend rearward past the mast).

Many sportsboat designs feature asymmetric spinnakers and, like skiffs, they are often sailed downwind by sailing a series of broad reaches in a shallower zig-zag pattern than with traditional symmetrical spinnakers.

As with the large mainsails, spinnakers are also generally much larger for a given hull size than had previously been used. Many sportsboats are fitted with an extendible bowsprit of 4–8 feet (1.2-2.5m) length, which moves the tack of the spinnaker away forward from the hull and allows better airflow and a larger sail size.

Some like the larger Thompsons and Phuket 8 feature a bowsprit that is both extendible as well as articulating - able to move from side to side - which is a system first used by Greg Young in the Bull series of boats, enabling the asym boat to sail at deeper angles downwind as the pole is squared back. For lighter smaller sportboats such as the Shaws, Vipers and wider French boats, the downwind performance aims to get the boats planing as early as possible, and thus the weight saved from using a simple extendable prod only is considered more valuable than the gains from articulation.

Hull design

Sportboat hulls have many elements in common with skiffs such as an almost flat bottom, a fine bow and a flat aft section - in short, a planing hull form.

This very efficient, low-drag shape, combined with the large, powerful rig and sail design and the light weight construction of most sports boats is what gives them their significant speed advantage over traditional designs.

To offset the large sail area and the resulting significant heeling momentum there are 3 main design philosophies: 1. a deep and heavy keel; 2. a way to get the crew further off the centreline by using wings, racks, hiking aids or trapezes; and, 3. a reduction in sail area, leading to a reduction in displacement, leading to less need for sail area and thus a reduction in heeling momentum. Many modern sportsboats use some combination of 1&2 or 2&3 also, with option 1 tending to favour upwind legs, and option 3 tending to favour downwind; option 2 being an advantage in all respects except rating.

Most sports boats use the modern fin and bulb design, which may also be lifting for ease of storage, as most sportsboats are designed to be taken out of the water on a daily or regular basis.

Accommodation

Most sportsboats have no or very little on-board accommodation as they are primarily intended to be sailed in short races around laid courses on sheltered waters. They are like track racing cars - intended only for use in races for limited durations. A typical club sportboat race would be between 2 and 3 hours long and the biggest regattas would usually feature 3-4 races a day, each of only 1 to 1.5 hours duration.

Cockpits are usually fully open and the only covered area is a very small and spartan fore-cabin (cuddy), usually used only for storing sails and essential safety equipment. Even larger sports yachts which often do have a proper cabin below are often missing all the usual features of a yacht. Sinks, toilets, bunks, water tanks and cooking equipment are usually missing. Often a moulded hard plastic seat on either side of the cuddy and a removable chemical toilet are the only amenities.

A number of trailer sailers in the past have attempted to use sportboat like design and construction while retaining the interior cabin volume and amenities; most have ended up being quicker than trailer sailers only due to their stripped out interiors (compared to their competitors with toilets, cookers, cushions, etc.) and have been not competitive against true sportboats. In the larger sizes, there have been a number of sportboats that have managed to achieve both accommodation as well as performance, including the Young Rocket, Stealth designs from Alan Carwadine and various Elliott configurations.

Sportsboat-specific handicapping systems

Sportsboats at first raced in existing class divisions under existing handicapping systems. As the number of sportsboats continued to grow specific divisions for them have become increasingly common at all levels of racing. In Europe and the USA, the trend has been more for One Design racing where all boats are identical.

Rules currently used to rate sportsboats include sportsboat rule SBR[1] which will be discontinued at the end of 2010, and individual country rule systems such as the New Zealand Sportsboat box rule and Australian SMS system. Some boats uses trapezes, racks and wings to increase performance. Heavier designs such as the SB3, J80, Flying Tiger and Platu are competitive in handicap racing, but are significantly slower compared to the lightweight racers.

Sportsboat developments worldwide

European sportsboats

While asymmetric sportsboats had been available for some years (Cork 1720, Bull 7000, Melges 32) sailing in handicap events, the launch of the Tony Castro designed Laser SB3(Dart SB3 in Australia) in 2002 made a huge difference to take-up of sportsboat sailing.

The SB3 is one of the most popular sportboats of the modern era with over 600 sold worldwide (mainly in Europe) and it has been the largest class at the annual Cowes Week regatta with over 80 boats. The SB3 widened the appeal of sportsboats by preventing hiking and having a heavier keel providing more stability - making it suitable for a wider range of sailors and over 100 boats attend the annual class regatta which will be held in the UK in 2011 and Australia in 2012. The manufacturers also marketed the boat by putting top Olympic sailors into regattas and by aggressive pricing into some markets (e.g. Ireland) for early adopters - as well as holding an annual race between the class winners at Cowes Week.

French sportboats generally sail in handicap events and tend to be similar to the open 60s and open 70s shape; with very wide bodies, rotating rigs, non masthead kites and masts set well back. Examples include the Open 5.70, Open 6.50 and the more recent Karver 650; all of which have twin rudders and many of the other typical features of the larger shorthanded and ocean racer design formats.

Australia/NZ sportboats

Popular boat designs in Australia include the Melges 24, Viper 640, Esse 850, Elliott 7, Shaw 650 and Hobie magic 25. More recently, New Zealand and Australian designs have become increasingly popular including various designs by Thompson, the Phuket 8 by Duncanson and a variety of boats by Shaw Yacht design.

The Racetrack website has kept relative performance data between a variety of Australian and New Zealand sportboats, in order to assess comparative performance. To date, the fastest sportboats have tended to be the lightest, least ballasted, widest boats, with the Rob Shaw designed 7 and 7.5m designs being the fastest in New Zealand, and the largest 8m Allan Carawadine and Bethwaite designs proving fastest in Australia.

The Australian Sports Boat Association is now the body that represents sportboat sailing in Australia. The Association is fully affiliated with Yachting Australia and aims to regulate and promote the racing of sports boats at regattas throughout Australia.

ASBA, incorporated in 2007, was founded by sports boats sailors Cameron Rae, Mark Roberts and Richard Parkes. The trio wanted to see a more scientific approach taken to handicapping the various designs racing together. Prior to the formation of ASBA handicaps were considered to be a bit of a lottery. Membership continues to grow with members in every state of Australia. The Association represents a myriad of sports boats including Thompson 7's, 750's and 8's, Elliott 7's and 780's, Shaw 650s, Stealth 7's and 8's, Melges 24's, Hobie magic 25's and a host of other sports boat designs. Using their own new rating system called SMS the Association is aiming to create a level playing field for multiple designs, and to encourage high performance designs without the excessive penalties currently existing in other rating systems.

USA sportsboats

The Melges 24, launched in 1993 has set the worldwide benchmark for what a modern Sportboat should be. Selling over 800 boats, half this fleet has ended up in the US. The popularity of this boat led to a flurry of designs although none matched the Melges 24 in numbers sold. Other classes designed at that time have endured such as the Ultimate 20 and the Viper 640. During the mid-2000s there has been a resurgence in sportsboats. The Viper 640 has been revived after the class died out and is now one of the fastest growing classes in the US. The Ultimate 20 had a makeover with the adoption of carbon masts. Melges has launched two new models the 32 and 20, both have become popular in international markets. The latest designs have come from the Viper designer Brian Bennett with the VX One and JBoats with their J70 (though due to mediocre downwind performance, most sailors who do not own a J70 do not consider the J70 to be a "sportsboat" ), which is due to launch later this year, as well as the Shaw 650 which is now also available in USA.

Notable incidents

During the 2011 Chicago Yacht Club Race to Mackinac, the high performance monohull sportsyacht Kiwi 35 WingNuts turtled in an extreme storm, killing the captain and one crew member. Later inquiry said that the boat — specifically its high performance extremely wide low displacement hull[2][3][4] — was unfit for the location, weather and the multiday and lengthy race, and urged race officials to change ratings and revoke privileges to enter the race.[2][5][6][7] [upper-alpha 1] The waves were not all that unusual, although the wind was. The boat may have buried one of its hiking wings into a wave, causing it to 'trip,' and had the other lifted by the wind.[3] It is rare but not unheard of for keelboats to turtle and remain upside down, particularly if it has not lost its keel. However, this boat's unique hull form, which made it very fast, also rendered it more stable upside down than right side up. This was a recipe for the disaster.[3][4] This loss was occasioned despite a competent and experienced crew which was as well equipped and prepared as thought to be necessary.[4][5][6][7] WingNuts met then current offshore stability standards, which failed to adequately take into account the effect of the "radical" winged hull.[2][3][5][6] [upper-alpha 2]

See also

References

Footnotes

  1. ↑ On the other hand, one meteorologist suggested:
    "Veteran Chicago-Mac racers have encountered similar conditions during previous races and understand that coping with severe weather is part of the challenge. Skippers must prepare their boats, train their crew, maintain a watchful eye for approaching storms and "the dearest friend (and most menacing foe) of all sailors -- the wind."
    Thornton, Mark A. (August 2011). "2011 Chicago-Mackinac Race: A Meteorological Summary". Retrieved 6 December 2013.
  2. ↑ "On paper, WingNuts met all stability requirements for the Chicago-Mac race. The race required that all boats have an Offshore Racing Rule (ORR) handicap measurement certificate, a document that includes two measures of stability: Limit of Positive Stability (LPS) and the Stability Index (SI). However, after the accident, the US Sailing panel found that the ORR formulas did not adequately penalize the Kiwi 35’s extreme flare, the difference between the waterline beam and the maximum beam. When the panel eliminated a fixed lower limit for the “capsize increment” — one of the factors used in the calculating stability index — WingNuts’ index of 100.7 plummeted to 74.4. No other boat in the race had the same drastic reduction in its stability index when the same math was applied. In addition, the panel noted that the Right Arm Curve (GZ Curve)—a graphic representation of the boat’s stability—revealed WingNuts to be just as stable inverted as it was right side up, sharply reducing any chance of recovery from a full capsize." "PS Analysis: The 2011 WingNuts Capsize Practical Sailor". Practical Sailor. April 2012 Issue. Retrieved 6 December 2013. Check date values in: |date= (help)

Endnotes

  1. ↑ "RYA and RORC Sportsboat Rule 2006 Rating Office" (PDF). Rating Office.
  2. 1 2 3 Landry, Chris (31 January 2012). "Boat in fatal capsize was 'inappropriate' for race". Soundings. Retrieved 7 December 2013.
  3. 1 2 3 4 Sharp, Eric (21 July 2011). "Kiwi 35 'probably as stable upside down as she was upright'". Detroit Free Press. SailWorld.com. Retrieved 6 December 2013. including a picture of the turtled WingNuts
  4. 1 2 3 "PS Analysis: The 2011 WingNuts Capsize Practical Sailor". Practical Sailor. April 2012 Issue. Retrieved 6 December 2013. Check date values in: |date= (help)
  5. 1 2 3 Rousmaniere, John (13 September 2012). "Sailing Accidents: Lessons Learned". Sail (magazine). Retrieved November 27, 2013.
  6. 1 2 3 Keilman, John (30 October 2011). "Report: Boat in deadly accident unfit for Mackinac race — Craft that capsized called too unstable for long competition in area prone to severe weather". Chicago Tribune. Retrieved 22 November 2013.
  7. 1 2 Hawley, Chuck; Rousmaniere, John; Naranjo, Ralph; McCurdy, Shiela (18 October 2011). "Inquiry Into the Chicago yacht Club-Race to Mackinac Capsize and Fatalities" (PDF). US Sailing. Retrieved 23 November 2011.

External links

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