 | |
 | |
| Development | |
|---|---|
| Designer | Knud Olsen  |
| Boat | |
| Crew | 1 |
| Draft | 0.91 m (3 ft 0 in) |
| Hull | |
| Construction | plywood, fiberglass |
| Hull weight | 72 kg (159 lb) |
| LOA | 4.00 m (13 ft 1 in) |
| Beam | 1.42 m (4 ft 8 in) |
| Hull appendages | |
| Sails | |
| Mainsail area | 8.95 m2 (96.3 sq ft) |
| Racing | |
| D-PN | 96.5 [1] |
| RYA PN | 1100 [2] |
The OK Dinghy is an international class sailing dinghy, designed by Knud Olsen in 1956.
In 1956 Axel Damgaard Olsen of Vordingborg, asked the Danish yacht designer Knud Olsen to prepare drawings for a light and fast single-handed sailing dinghy based on conventional plywood construction. The resulting design was named the "OK", using Knud Olsen's initials in reverse.
The OK was intended as a preparation class for the Olympic Finn and it has followed its technical evolution ever since. The rig is identical to a Finn comprising a single sail set on a rotating, un-stayed, bending mast.
OKs are built in plywood, G.R.P and composite construction; all forms enjoy equal racing success. Freedom of choice in hull materials is replicated in choice of rig. The choice of mast, sail and fittings must fit within the class rules but enables all sailors to have a combination suited to their own requirements. Consequently, every OK develops to suit the owner's style of sailing, while the shape of the hull is defined by a comprehensive set of strict one-design rules ensuring a long competitive life span. Old boats often only need a rig update and minor constructional modifications to make them competitive, provided they meet modern buoyancy requirements.
In the 60s and 70s, the OK class enjoyed an explosive success, with the total number of boats exceeding 10,000, and large racing fleets building up. In the 80s, the success of the popular one-design single-handed Laser affected the success of the OK.
In the eastern European countries, the OK was the official youth single hander and after the breakdown of the USSR, many 'old' sailors came back to the class of their youth, now with their own boats instead of club-owned.
The OK Dinghy was selected as the Open class single hander for the Asian Games 1998.
In 2003 carbon fibre masts were introduced to the class.
In 2005, there was a revival of the OK class with many older boats being restored and updated, new boats being built and participation in club races rising.
The 50th anniversary of the design of the OK dinghy was marked by the largest ever OK Dinghy World Championships held at Łeba on the Polish coast in July 2007. [3]
Dinghy sailing is the activity of sailing small boats by using five essential controls:
The Mirror is a type of popular sailing dinghy with more than 70,000 built.
Dinghy racing is a competitive sport using dinghies, which are small boats which may be rowboats, have an outboard motor, or be sailing dinghies. Dinghy racing has affected aspects of the modern sailing dinghy, including hull design, sail materials and sailplan, and techniques such as planing and trapezing.
The Albacore is a 4.57 m (15 ft) two-person planing dinghy with fractional sloop rig, for competitive racing and lake and near-inshore day sailing. Hulls are made of either wood or fiberglass. The basic shape was developed in 1954 from an Uffa Fox design, the Swordfish. Recent boats retain the same classic dimensions, and use modern materials and modern control systems.
The Laser is a class of single-handed, one-design sailing dinghies using a common hull design with three interchangeable rigs of different sail areas, appropriate to a given combination of wind strength and crew weight. Ian Bruce and Bruce Kirby designed the Laser in 1970 with an emphasis on simplicity and performance.
The Finn dinghy is a single-handed, cat-rigged sailboat, and a former Olympic class for men's sailing. Since its debut at the 1952 Summer Olympics in Helsinki, the Finn featured in every summer Olympics until 2020, making it the longest serving dinghy in the Olympic Regatta and one of the most prolific Olympic sailboats,. The Finn is a physically demanding boat to race at the highest levels, especially since the class rules now allow unlimited boat rocking and sail pumping when the wind is above 10 knots. The event will not feature on the Olympic programme from 2024.
The Wayfarer is a wooden or fibreglass hulled fractional Bermuda rigged sailing dinghy of great versatility; used for short 'day boat' trips, longer cruises and for racing. Over 11,000 have been produced as of 2016.
The Optimist is a small, single-handed sailing dinghy intended for use by young people up to the age of 15.
The 49er and 49er FX is a two-handed skiff-type high-performance sailing dinghy. The two crew work on different roles with the helm making many tactical decisions, as well as steering, and the crew doing most of the sail control. Both of the crew are equipped with their own trapeze and sailing is done while cantilevered over the water to the fullest extent to balance against the sails.
The Laser 4.7 or ILCA 4 is a one-design dinghy class in the Laser series and is a one-design class of sailboat. All Lasers are built to the same specifications. The Laser is 4.06 m long, with a waterline length of 3.81 m. The hull weight is 59 kg (130 lb). The boat is manufactured by ILCA and World Sailing approved builders.
Knud Olsen was a Danish builder and designer of boats, who designed one of the most popular sailing dinghies in use over the past 50 years, the OK Dinghy, which became an ISAF International Class in 1974.
The Byte is a small one-design sailing dinghy sailed by one person. It was designed by Canadian Ian Bruce, who also commissioned and marketed the Laser.
The Moth is a small development class of sailing dinghy. Originally a small, fast home-built sailing boat designed to plane, since 2000 it has become an expensive and largely commercially produced boat designed to hydroplane on foils though many are still built at home, typically at much lower cost.
The P-Class is a type of small single sail dinghy, popular as a training boat for young people in New Zealand. This class is famous for being the sailing trainer vessel for many new entrants into the sport, and virtually every famous New Zealand yachtsman, including Sir Peter Blake and Russell Coutts, learnt to sail in one. The P-Class was for many years the most common sailing boat in New Zealand.
The Laser 3000 is a racing sailing dinghy crewed by two persons with a trapeze for the crew. Launched in 1996, the 3000 was developed from the Laser 2, using the original Frank Bethwaite-designed planing hull combined with a brand new self-draining deck by Derek Clark. Clark also re-designed the rig, using spars and sails from premium proprietary sources and replacing the symmetric spinnaker of the Laser 2 by a larger asymmetrical spinnaker. The gennaker is chute-launched and retrieved using a single halyard line, and is set on a retractable bowsprit. Helm balance and handling were improved using a shorter-footed mainsail with two full-width battens giving a larger roach. A mast with conventional spreaders replaced the now-unusual diamond arrangement of the Laser 2.
The 2000(formerly the Laser 2000) is a performance sailing dinghy designed by Phil Morrison and currently sold by RS Sailing. It combines a traditional GRP hull and foam sandwich deck moulding with a modern asymmetric rig including a furling jib, reefing mainsail and single line gennaker hoist system.
A trailer sailer is a type of sailboat that has been designed to be easily transported using a boat trailer towed by an automobile. They are generally larger than a sailing dinghy. Trailer sailers include day sailers and small cabin cruisers, suitable for living on.
The Norfolk Punt is a type of yacht, derived from the flat-bottomed gun punts that roamed the Broadland waters in the mid-to-late 19th century. However, at the turn of the 20th century, in order to get to and from the hunting grounds more quickly, the punters developed their highly unstable craft to carry a basic mast and sail for travelling with the wind. It is from these humble beginnings that one of the country's most exciting and powerful racing dinghy classes was born.
The Farr 3.7 is a one-person sailing dinghy designed by Bruce Farr in 1971. The design plans are sold by the 3.7 Class Owners Association and they are built by a mix of professionals and home built by amateurs. The 3.7 Class is recognised by Yachting New Zealand as a national class and yachts are sailed in New Zealand, Australia and Great Britain. Full sets of plans have been sold worldwide to a number of individuals with greatest numbers in Germany, Japan, USA, South Korea, Poland, France, Belgium, Russia, Spain, Uruguay.
The Solution is a single handed hiking dinghy designed for helms in the 65 to 85 kg weight range. It has a light epoxy hull, self draining cockpit, high aspect rig, semi battened 8.5 sq. metre sail, and full complement of dual controls.
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