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Table 3.

Average values (for all subjects and all speeds) of the efficiencies measured in this study with and without fins

Efficiencies
ηMηPηHηFη
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
ηMηPηHηFη
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.

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