A tall ship is a large, traditionally-rigged sailing vessel. Popular modern tall ship rigs include topsail schooners, brigantines, brigs and barques. “Tall ship” can also be defined more specifically by an organization, such as for a race or festival.
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In the 21st century, “tall ship” is often used generically for large, classic, sailing vessels, but is also a technically defined term by Sail Training International for its purposes and of course, STI helped popularize the term. The exact definitions have changed somewhat over time, and are subject to various technicalities, but by 2011 there were 4 classes (A, B, C, and D). Basically there are only two size classes, A is over 40 m LOA, and B/C/D are 9.14 m to under 40 m LOA. The definitions have to do with rigging: class A is for square sail rigged ships, class B is for “traditionally rigged” ships, class C is for “modern rigged” vessels with no “spinnaker-like sails”, and class D is the same as class C but carrying a spinnaker-like sail.