During restoration work at the Swedish Kalmar Castle various shipwrecks of the Middle Ages were found in the mid-30s. One of them, known as Kalmar I, was so well preserved that it was almost completely restored with its original parts. It was an open coastal sailor of the Baltic Sea from the 13th century. and is typed as "Byrding". The boat has a length of 11.2 meters and a width of 4.6 meters. The boat is made in the well-known from other sources medieval construction, with the crossbars were pulled through the side walls. This can also be seen in Hyde 1200, Gdansk 1300 or Southampton 1400, among others. These beams were connected to the side wall with additional angle brackets. A special feature of the KALMAR is the fork support in the bow, on which the foldable mast could be stored. Like all northern boats of the time, the boat was made of clinker and almost entirely made of oak. These boats were in the entire Baltic Sea area as a coastal driver on the road but also in the lower reaches of Elbe, Oder or Memel. The low draft of about 1.1 meters made this possible. A Kalmar had a crew of 4 - 6 sailors.
unpainted kit casted in resin - sail from cotton included