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Table 1.

Physical characteristics of the fins (Apollo Bio Fin Pro)

Fin characteristics
Fin sizeMass (kg)Length (m)Width (m)Surface area (m2)Foot SA (m2)Fin/foot SA*
No. 4 1.98 0.50 0.19 0.086 0.026 3.36 
No. 5 2.78 0.57 0.22 0.110 0.031 3.53 
Fin characteristics
Fin sizeMass (kg)Length (m)Width (m)Surface area (m2)Foot SA (m2)Fin/foot SA*
No. 4 1.98 0.50 0.19 0.086 0.026 3.36 
No. 5 2.78 0.57 0.22 0.110 0.031 3.53 

Fin length, measured from the feet to the trailing edge; fin width,measured at the trailing edge.

The subjects used fins of different sizes depending on their foot dimension(Foot SA: surface area of the foot).

*

In both cases fins increase the surface of the `propeller' of a similar amount (by about threefold).

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