0
RESEARCH PAPERS

The Dynamics of Discus Throw

[+] Author and Article Information
T.-C. Soong

Xerox Corporation, Rochester, N. Y.

J. Appl. Mech 43(4), 531-536 (Dec 01, 1976) (6 pages) doi:10.1115/1.3423924 History: Received January 01, 1976; Revised March 01, 1976; Online July 12, 2010

Abstract

The analysis contains the derivation and a solution method for six nonlinear differential equations of motion which describe the c.g. position and orientations of the principal axes of a spinning discus moving in air. The aerodynamic pressure on the discus is obtained from existing experimental data on inclined plates and disk-shaped bodies; the effect on the moment due to the spinning motion is derived from the classical hydrodynamics of a rotating ellipsoid in a flow field. A case study, analyzed in the context of the 1972 World Olympics discus throw (which recorded 64.39 m or 211 ft 3 in.), showed that a fast-spinning discus will go farther than one not spinning by 13.8 m in this range. The optimum angle and optimum initial discus inclination are 35° and 26°. This combination of angles is found to be superior to the commonly accepted combination of 35° and 35°. The 35°/26° combination produced a gain in distance of 1.55 m over the 35° /35° combination. The results of the analyses presented here, including the effect of wind, agree closely with the experience of expert discus throwers.

Copyright © 1976 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In