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stepping stones of maritime history



The Bremer Kogge was a big ship in her time. She is the best preserved medieval cog in the world. Since the identification of the wreck as a Cog another 20 have been identified in Nothern Europe.

The Bremer cog was characterized by a flush-laid flat bottom at midships gradually shifting to clinker build, overlapping strakes near the posts. Both stem and stern posts were straight and rather long, and connected to the keelplank through intermediate pieces called hooks. Strong cross-beams, usually protruded through the ship's sides, holding the sides together.

During the 14th century some of the cogs were constructed with a carvel hull (see Darsser Cog), but clinker still dominated.

Cog specifications

There is a set of features, which one must keep in mind when classifying a cog-type vessel, as specified below:

  • Clinker outer planking at the sides of the hull.
  • Straight stem and sternpost.
  • Plank keel.
  • Use of twice bent iron nails for the fastening of overlapping edges of the planks.
  • Use of moss for caulking
  • Use of laths and iron clamps for the covering of the plan seams.
  • Use of scarfs for connection the hull planks.
  • Use of hooks for connecting the stem and sternpost to the keel.
  • Strong cross-beams, usually protruded through the ship's sides.
  • Fitting the garboard and the bottom planking into the rabbets of the stem and the sternpost.
  • Carvel bottom planking.

Bremer Cog

Line drawing of the Bremer Cog.



A 14th century cog. This vessel was fitted with a single mast and a square-rigged sail. The Bremer Cog was the first Cog found in almost complete state.
Length: 23.27 m
Width: 6.62 m
Height: 3 m with castle 7.62 m.
Cargo ca. 160 m square.



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