Biggest of all was the 40 built by Ptolemaios IV at the end of 3rd century. It was probably a catamaran design as the ship was reported to have 2 prows, 2 sterns and 4 steering oars. It was 429 feet long, 58 feet wide, powered by 4000 oarsmen and could accommodate 2900 mariners (enough crew to man 12 Pentereis!) and a vast assortment of catapulta. The oaring arrangement is uncertain, with some claiming that oars were used on both sides of the hulls, others only the outer. The first would have meant 8-7-5 on each side while the second offers the possibility of either 16-14-10 or 8+8-7+7-5+5 (push+pull).
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