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Related Experiment Videos

Optimal discus trajectories.

Mont Hubbard1, Kuangyou B Cheng

  • 1Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA, USA. mhubbard@ucdavis.edu

Journal of Biomechanics
|September 4, 2007
PubMed
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This study presents a 3-D dynamic model for discus flight, optimizing release conditions to maximize throwing range for both men and women. Optimal strategies enhance performance beyond 2-D models by utilizing advantageous lift orientation during flight.

Area of Science:

  • Sports Science
  • Aerodynamics
  • Biomechanics

Background:

  • Discus throw performance is influenced by complex aerodynamic and dynamic factors.
  • Previous models often simplify discus flight dynamics, limiting predictive accuracy.

Purpose of the Study:

  • To develop and validate a general 3-D dynamic model for men's and women's discus flight.
  • To determine optimal release conditions (angle, pitch, roll, spin) for maximizing throwing range.
  • To compare 3-D model predictions with 2-D models and experimental data.

Main Methods:

  • Developed a 3-D dynamic model incorporating aerodynamic pitching moment and spin precession.
  • Estimated pitching moment coefficient dependence on angle of attack from experimental data.
  • Used numerical integration of 11 equations of motion to simulate discus flight.

Related Experiment Videos

  • Iteratively calculated optimal release conditions to maximize range.

    • Main Results:

    • Optimal release conditions for maximizing range were found to be similar for men and women.
    • The optimal men's trajectory achieved a range of 69.39 m with specific release angles and spin rates.
    • 3-D modeling predicted greater range than 2-D models due to advantageous lift orientation and reduced axis tilt at landing.
    • Optimal strategies showed discontinuous behavior with wind speed, leading to 'slicing' and 'kiting'.

    Conclusions:

    • The 3-D dynamic model provides a more accurate prediction of discus flight and range.
    • Optimal release strategies are crucial for maximizing discus throw performance.
    • Further research should investigate the dependence of release conditions on release velocity.