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The thole ports in a given group of three are about ten inches apart and the groups themselves, center to center, are a bit less than four feet apart. - (Raiders of Gor, Chapter 14, Sentence #51)

This brings many more free fighting men, the oarsmen, into any action which might be required. They, while rowing, are protected, incidentally, by a parapet fixed on the rowing frame. Between each pair of benches, behind the parapet, is one bowman. The thole ports in a given group of three are about ten inches apart and the groups themselves, center to center, are a bit less than four feet apart. The Dorna carried twenty groups of three to a side, and so used one hundred and twenty oarsmen. 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. - (Raiders of Gor)