The flyboat (also spelled fly-boat or fly boat) was a European light vessel of Dutch origin developed primarily as a mercantile cargo carrier, although many served as warships in an auxiliary role because of their agility. These vessels could displace between 70 and 200 tons, and were used in the late 16th and early 17th centuries. The name was subsequently applied to a number of disparate vessels which achieved high speeds or endurance. At the beginning of the 17th century they were replaced by the fluyt, which in England was also known as a fly-boat.