1. The accuracy of models of thrust in tethered water boatmen.
The accuracy of models of thrust in tethered water boatmen. Power strokes were predicted by three models, each presented here with a unique symbol. For each power stroke in an experiment, the momentum predicted by each model is plotted against the momentum measured for the same power stroke. The three model predictions are linked by a horizontal line and each individual is uniquely color coded. Deviation from the unity line (gray curve) represents inaccuracy in the prediction of a model. Thrust generated solely by pressure drag on the paddle (filled circles) showed little deviation from the unity line (R2=0.98, N=9). This model was not improved by adding the momentum generated by the acceleration reaction (filled squares, R2=0.97). The thrust generated by skin friction on the paddle (filled triangles) yielded highly inaccurate predictions of momentum (R2=0.25).
Victoria Ngo, and Matthew James McHenry J Exp Biol 2014;217:
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