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A new system for analyzing swim fin propulsion based on human kinematic data
Guillaume Nicolas1, Benoit Bideau, Nicolas Bideau
1Laboratoire M2S "Physiologie et Biomécanique", Université de Rennes 2-ENS Cachan, Avenue Charles Tillon, 35044 Rennes, France. guillaume.nicolas@uhb.fr
Journal of Biomechanics
|April 23, 2010
Summary
A new automated system, HERMES, allows for standardized testing of swim fins. This system accurately measures ankle force and hydromechanical efficiency, revealing optimal performance within a specific Strouhal number range.
Area of Science:
- Biomechanics
- Fluid Dynamics
- Hydrodynamics
Background:
- Swim fin design is subjective, lacking quantitative data on performance.
- Human swimming technique variability hinders reproducible analysis of swim fins.
- Existing methods for swim fin evaluation are limited by inconsistencies.
Purpose of the Study:
- To introduce and validate HERMES, an automated test bench for swim fin evaluation.
- To provide a standardized and reproducible method for assessing swim fin performance.
- To quantify the impact of fin characteristics on swimming dynamics.
Main Methods:
- Developed and validated the HERMES automated system for standardized fin-swimming motion.
- Tested seven swim fins with diverse geometrical and mechanical properties.
- Measured ankle force and calculated hydromechanical efficiency for each fin.
Main Results:
- HERMES reliably reproduces human fin-swimming motions and provides dynamic measurements.
- Calculated hydromechanical efficiencies reached up to 70% for certain fins.
- Peak efficiencies were observed within a Strouhal number range of 0.2-0.4.
Conclusions:
- The HERMES system offers a reproducible method for evaluating swim fins.
- Fin efficiency is significantly influenced by kinematic and material properties.
- Further research can explore the relationship between fin design, wake structure, and efficiency.
