Some time ago I found a paper on Internet about an ancient ship.
H. Brandt, K. Hochkirch [TU Berlin Institute of Naval Architecture, Marine and Ocean Engineering (ISM), TU Berlin] Ship Technology Research Vol. 42, No. 1, January 1995:
"A Hanse cog was discovered during dredging work in the port of Bremen in 1962. The cog's construction was dated to the year 1380 by means of dendrochronological analysis. Until this finding was made, virtually nothing was known about the shape and rigging of Hanse cogs. The sole source for information on their appearance had been illustrations on seal impressions, which provide only an approximate idea. Accounts of possible travelling speeds vary greatly, i.e. between 3.3 and 10 knots; data on weather conditions and wind directions are completely absent from reports.
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