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A tjotter is the smallest of the open round Fries sailing ships with a length on the stern exceeding 5.4 m.
The ship has no roundwood or. It has a wide helm. The head of the rudder is usually decorated with a click where a bird is outstretched.
Originally, the tjotter was used in Friesland for small-scale transport of goods and people at a time that there were only few roads. A tjotter with the size 4.8 m x 2.4 m in Friesland is called a "fjouwer-yacht".
At the warf of Pier Piersma, fjouwer-yachts are still commonly build.