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• W50794676 abstract "The mechanical efficiency of a rowing oar during the drive phrase may be defined as that proportion of the energy put into the oar by the rower which is usefully dissipated in overcoming hull and aerodynamic drag as the boat is propelled forwards. Ignoring friction in the oar gate/pivot, the remaining energy is uselessly dissipated by the blade as it shifts and churns water. As an example of energy analysis of propulsion systems, the energy efficiency for a slipping and a non-slipping car wheel is derived. The same method applied to the oar, shows that the efficiency of the oar is inextricably related to the direction of the water reaction force on the blade. If, as is usually assumed, the force is normal to the oar-shaft direction, the efficiency of the oar can be expressed as V sin(A)/(omega l), where V is the hull speed through the water, omega is the rotational speed of the oar, l is the distance from the gate to the centre of force on the blade, and A is the angle of the oar-shaft to the boat forward direction. We consider the efficiency of the oar from catch to square-off, using data gathered from an elite eight rowing at the Australian Institute of Sport. We show that, except for a degree or two of oar-sweep at the catch, when the force is negligible, the efficiency is greatest towards square-off, where a greater portion of the blade force is directed forward, which agrees with the results of Affeld et al. (Int. J. Sports Medicine, 14:S39-S41, 1993). Correlations of force profile shape with average efficiency show that a later application of the maximum force, nearer square-off, is generally more efficient than an earlier application. However, since the oar efficiency increases with boat speed, less efficient oars, for which the maximum force is applied near the catch, cause a greater increase of the boat speed early in the stroke, and this tends to enhance the efficiency of all the oars later in the stroke." @default.
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• W50794676 date "2008-06-08" @default.
• W50794676 modified "2023-09-24" @default.
• W50794676 title "Energy efficiency of the rowing oar from catch to square-off" @default.
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