It's been nearly 30 years since John Duke, a former Yale University and USA National Team oarsman, set up a small shop in Rhode Island, USA to begin fine-tuning his innovative water-resistant rowing machine. With its beautiful design and unmatched feel, the WaterRower quickly gained a cult-like following of both on-water rowers and fitness enthusiasts that had found their perfect piece of workout equipment. As word spread of the new product that simulated the feel of on-water rowing, WaterRower transitioned from simply a one-off product found within the occasional boathouse to an established brand in both the rowing and fitness world.
Although the oar can be conveniently thought of as a lever with a "fixed" pivot point in the water, the blade moves sideways and sternwards through the water, so that the magnitude of the propulsion force developed is the result of a complex interaction between unsteady fluid mechanics (the water flow around the blade) and solid mechanics and dynamics (the handle force applied to the oar, the oar's inertia and bending characteristic, the acceleration of the boat and so on).
In sweep or sweep-oar rowing, each rower has one oar, held with both hands. This is generally done in pairs, fours, and eights. In some regions of the world, each rower in a sweep boat is referred to either as port or starboard, depending on which side of the boat the rower's oar extends to. In other regions, the port side is referred to as stroke side, and the starboard side as bow side; this applies even if the stroke oarsman is rowing on bow side and/or the bow oarsman on stroke side.