dimensions of wheels derailleurs chainwheels ...where?
I think you will find that rowing with the legs is primarily a part of
racing where the boat is fitted with a sliding seat, or an exercise
machine. Granted that the time a workman rowed a boat is probably long
past, but I can tell you that rowing, say an 18 ft. dory, was not done
with the legs :-)
But greek warships were, and that let them row circles around the Phoenicians, and defeat them.
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