Read publications on rowing and erging:
Modelling the Rowing Stroke in Racing Shells
Maurice N. Brearley, Neville J. de Mestre and Donald R. Watson
The Mathematical Gazette , Vol. 82, No. 495 (Nov., 1998), pp. 389-404
Published by: The Mathematical Association
Article Stable URL: http://www.jstor.org/stable/3619885
The water drag force
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\large $D = a + bv + v^2$
, where
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\large $v$
is the velocity of the racing scull, and
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\large $a, b,$ and $c$
are constants that can be obtained through regression analysis from rowing data.