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Should the finger pressure be well distributed across the seam in seam bowling? A problem of precession and torque

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conference contribution
posted on 2024-07-09, 17:43 authored by Franz Fuss, Robert Masterton Smith
In seam bowling, the first two fingers are supposed to impart equal amounts of back-spin to the ball. As the rotating arm of the bowler and the backspin of the ball have different senses (clockwise vs. counterclockwise), the spin axis moves rapidly from one hemisphere to the other, thereby crossing the seam, when finger torque is imparted onto the ball. It is shown in this study analytically, that the rapidly precessing spin axis approaches the torque vector, but reaches the torque vector only at large times. From the experimental data, the spin and torque vectors are approximately 10-15° apart when releasing the ball in seam bowling. If the spin axis is not exactly at the pole of the ball, i.e. perpendicular to the seam, then the seam wobbles by twice the angle between spin and torque vectors. It is therefore advisable to have the finger centre of pressure slightly off seam by 10-15°.

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PDF (Published version)

ISSN

1877-7058

Journal title

Procedia Engineering: Proceedings of the 6th Asia-Pacific Congress on Sports Technology (APCST), Hong Kong, China, 18-20 September 2013 / K. M. Chan

Conference name

6th Asia-Pacific Conference on Sports Technology, APCST 2013

Location

Hong Kong

Start date

2013-09-18

End date

2013-09-20

Volume

60

Pagination

5 pp

Publisher

Elsevier Ltd

Copyright statement

Copyright © 2013 The Authors. Published by Elsevier Ltd. Open access under CC BY-NC-ND license. Selection and peer-review under responsibility of the School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University

Language

eng

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