Penteconter
They typically lacked a full deck, and thus were also called unfenced vessels (ἄφρακτοι νῆες, áphraktoi nḗes).According to some contemporary calculations, penteconters are believed to have been between 28 and 33 m (92 and 108 ft) long, approximately 4 m wide, and capable of reaching a top speed of 9 knots (17 km/h; 10 mph).However, modern reconstructions of penteconters, as well as other ancient ship designs such as triremes, crewed by modern untrained amateurs, attained that top speed fairly easily on initial sea trials, which implies that the top speed of that type of ship in the ancient era had to be substantially higher.Ancient Greeks also used the triaconter or triacontor (τριακόντορος triakontoros), a shorter version of the penteconter with thirty oars.The penteconter remained in use until the Hellenistic period, when it became complemented and eventually replaced by other designs, such as the lembus, the hemiolia and the liburnians.
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