Baidak (, , ) was a wooden sailing ship, similar to a cog. It had a flush-laid flat bottom approximately 3âÂÂ4 metres wide, which narrowed to tapered ends, and one 5 metre mast. Measuring approximately 15âÂÂ20 (or 36âÂÂ60) metres in length, a baidak could carry a load of approximately 200 tons. It could be operated by oars or sail.
Baidaky were in use from the 16thâÂÂ19th centuries in the territory of present-day Ukraine, primarily for cargo delivery on the Dnipro and Don rivers, however, they were also frequently used by the Zaporizhian Cossacks for their military campaigns to the Black Sea.