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18th century Frigate

In the 17th century, this term was used for any warship built for speed and maneuverability, In the 18th century, the term referred to ships that were usually as long as a ship of the line and were square-rigged on all three masts, they were rated ships of at least 28 guns, carrying their principal armaments upon a single continuous deck.

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(becouse all ship in the 18th century could fly...)