High Quality Content by WIKIPEDIA articles! The Sonar is a 7 m (23 ft) one-design keelboat for three to five people. The boat is 7 m long. It has a beam (width) of 2.4 m and draft (depth) of 1.2 m. It weighs 950 kg, of which 408 kg is ballast, with a sail area of 23.2 m plus a 22.8 m spinnaker. It is bermuda-rigged, with a large mainsail and a 100% jib. The Sonar is usually crewed by four. The Sonar has been a Paralympic class since 2000. When being sailed by disabled it is crewed by 3, and sailed without a spinnaker. Instead, when running downwind a whisker pole is used to hold the jib out to windward for maximum exposed sail area. The Sonar is well suited for handicapped sailing because of its large cockpit making adaptations easy. The Sonar was designed in 1979 by Bruce Kirby, designer of the popular Laser dinghy. Since then, over 800 boats have been built. Most of the fleet is in the USA, with smaller fleets in Britain and Canada. Since its adoption as a Paralympic class the Sonar has spread to many other countries as well.

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