The IOD (International One Design) sailboat has a rich history dating back to the early 20th century. The design of the IOD class was influenced by the Universal Rule, a rating rule developed in the early 20th century to handicap different designs of racing yachts. The idea was to create a level playing field for boats of different sizes and designs to compete against each other.
The IOD class specifically originated in 1936 when a group of American sailors spearheaded by Cornelius «Corny» Shields of Larchmont (NY) Yacht Club, commissioned the renowned Norwegian designer Bjarne Aas to create a 33-foot keelboat that would be suitable for both cruising and racing. The inspiration was Bjarne Aas 6 Metre «Saga» that Shields fell in love with on Bermuda. Aas came up with a design that combined classic lines with modern features, and the first (wooden) IOD boats were built in the Bjarne Aas shipyard on the island of Isegran, Norway to ensure maximum equality.
Over the years, the IOD class has seen some modifications, but the basic design principles have remained largely unchanged. The class has maintained its strict one-design philosophy to ensure that all boats are as equal as possible, placing the emphasis on the skill of the sailors rather than the technical specifications of the boats.
The class gained international popularity, and soon IOD fleets were established in various countries. The class rules were established to ensure that the boats remained true to the original design, promoting fair competition. The IOD class became known for its elegant appearance, seaworthiness, and competitive racing.
Today, the IOD class continues to thrive, with fleets racing in various locations around the world. The class has become a symbol of classic yacht racing, and many sailing enthusiasts appreciate the timeless design and competitive spirit of the International One Design sailboat.
Bjarne Aas and Cornelius Shields
IOD Class Norway 