A theory is developed to explain why racing shell crews use sliding seats and shorter-than-necessary stroke intervals, two features that tend to waste energy in a highly competitive, power-limited situation. The theory shows that sliding seats are used because they allow the crew to move the oar blades fast enough during the stroke to transfer all available power to the water. Shorter-than-necessary stroke intervals are used to minimize the sum of the power dissipated in developing thrust, which decreases with the relative length of the stroke interval, and the power dissipated in hull drag due to fluctuations about average velocity, which increases with the relative length of the stroke interval. Using representative dimensions and masses, a typical value of average velocity for a race, and independently estimated values of drag and thrust coefficients, the theory predicts an optimum stroke fraction of 0.400, an optimum stroke rate of 45 per min, and an accountable power of 0.46 hp/man for an eight-oar racing shell, values that agree remarkably well with those used under competitive racing conditions. The theory indicates that using wider-bladed oars might improve performance; the theory also supports a suggestion made to the writer by R. A. Swanson that crossing the oars over the shell would improve performance.
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August 1981
Research Papers
Why Sliding Seats and Short Stroke Intervals are Used for Racing Shells
M. Senator
M. Senator
Summit, N.J. 07091
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M. Senator
Summit, N.J. 07091
J Biomech Eng. Aug 1981, 103(3): 151-159 (9 pages)
Published Online: August 1, 1981
Article history
Received:
January 9, 1980
Revised:
March 27, 1981
Online:
June 15, 2009
Citation
Senator, M. (August 1, 1981). "Why Sliding Seats and Short Stroke Intervals are Used for Racing Shells." ASME. J Biomech Eng. August 1981; 103(3): 151–159. https://doi.org/10.1115/1.3138271
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