Average values (for all subjects and all speeds) of the efficiencies measured in this study with and without fins
| . | Efficiencies . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|
| . | ηM . | ηP . | ηH . | ηF . | η . | ||||
| L | 0.11±0.02 | 0.36±0.01 | 0.59±0.01 | 0.61±0.01 | 0.04±0.01 | ||||
| LF | 0.13±0.02 | 0.58±0.03 | 0.82±0.03 | 0.70±0.02 | 0.08±0.01 | ||||
| (LF-L)/L (%) | 9±7 | 62±8 | 40±6 | 16±3 | 77±21 | ||||
| . | Efficiencies . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|
| . | ηM . | ηP . | ηH . | ηF . | η . | ||||
| L | 0.11±0.02 | 0.36±0.01 | 0.59±0.01 | 0.61±0.01 | 0.04±0.01 | ||||
| LF | 0.13±0.02 | 0.58±0.03 | 0.82±0.03 | 0.70±0.02 | 0.08±0.01 | ||||
| (LF-L)/L (%) | 9±7 | 62±8 | 40±6 | 16±3 | 77±21 | ||||
LF, with fins; L, without fins.
ηM, mechanical efficiency; ηP, propelling efficiency; ηH,hydraulic efficiency; ηF, Froude efficiency; η, performance efficiency(see text and Fig. 1 for details).
The parameters reported in this table are related as follows:ηM×ηP=η and ηP=ηH×ηF.
The last row reports the percentage difference between the L and LF conditions at comparable speeds.