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In a boat propelled by oars, the thwart has to be positioned with the right geometry for the oar to be worked efficiently and comfortably. Firstly, with a rearward facing oarsman, the thwart has to be nearer the front of the boat than the pivot point for the oar (which acts as a fulcrum). The usual distance between the after edge of the thwart and the oar's pivot is 10 - 12 in. The next consideration is height. The oarsman has to be positioned so that during the recovery part of the stroke, the oar is above the surface of the water, allowing

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