De Groene Draeck
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The "Groene Draeck" (Green Dragon) is the royal yacht of Queen Beatrix of the Netherlands. It was named after the flag ship of Piet Hein, a famous 17th century Dutch admiral.
The Groene Draeck is a traditional Dutch round bottomed sailing ship, build in 1957 in Amsterdam. It was offered by the Dutch people to princess Beatrix for her 18th birthday. Her sail number is therefore 18.