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If we suppose a trebly-banked ship with one hundred and twenty oarsmen, say, in three banks of twenty each to a side, I think we can see she would have to be a rather large ship, and a good deal heavier than the single-decked, three-men-to-a-bench type, also with one hundred and twenty oarsmen. - (Raiders of Gor, Chapter 14, Sentence #56)

From this account it may perhaps be conjectured why the oar power of a single-banked ram-ship is often comparable or superior to that of a doubly- or trebly-banked ship. The major questions involve the number and size of oars that can be practically mounted, balanced against the size of ship required for the differing arrangements. The use of the extended rowing frame, permitting the leverage necessary for the great oars, and the seating of several oarsmen, each with his own oar, on a given bench, conserving space, are important in this regard. If we suppose a trebly-banked ship with one hundred and twenty oarsmen, say, in three banks of twenty each to a side, I think we can see she would have to be a rather large ship, and a good deal heavier than the single-decked, three-men-to-a-bench type, also with one hundred and twenty oarsmen. She would thus, also, be slower. And this does not even take into consideration the longer, larger oar possible with the projecting rowing frame. To be sure, there are many factors involved here, and one might suppose triple banks following the model of the single-banked, three-men-three-oars-to-a-bench type, and so on, but, putting aside questions of the size of vessel required for such arrangements, we may simply note, without commenting further, that the single-banked, three-men-three-oars arrangement is almost universal in fighting ships on Thassa. - (Raiders of Gor)