An experimental aerodynamic study of a series of rugby balls

Djamovski, V and Alam, F 2011, 'An experimental aerodynamic study of a series of rugby balls', in Prof Mohammad Ali (ed.) International Conference on Mechanical Engineering (ICME2011), Dhaka, Bangladesh, 18 - 20 December 2011, pp. 1-6.


Document type: Conference Paper
Collection: Conference Papers

Title An experimental aerodynamic study of a series of rugby balls
Author(s) Djamovski, V
Alam, F
Year 2011
Conference name International Conference on Mechanical Engineering
Conference location Dhaka, Bangladesh
Conference dates 18 - 20 December 2011
Proceedings title International Conference on Mechanical Engineering (ICME2011)
Editor(s) Prof Mohammad Ali
Publisher BUET
Place of publication Dhaka, Bangladesh
Start page 1
End page 6
Total pages 6
Abstract The aerodynamic properties of oval shaped balls, rugby balls and Australian Rules (AFL) football, exhibit peculiar trends which impacts sharply on the balls flight trajectory; with a kicking efficiency of only 60% amongst elite footballers in AFL and NRL, understanding the physics behind oval shaped balls can be very perplexing. Very little literature has been made available on the aerodynamic characterisitics of oval shaped balls, under non-spinning conditions. THe rugby and AFL footballs are asymmetric by design, and hence can rotate both laterally and longitudinally, not to mention an offset angle to these axes of rotation. Initial tests of three differing rugby balls, positioned at a zero pitch angle but with a varying yaw angle have been analysed with curious results. Subsequently, a look into the flow around these balls was studied using flow visualisation methods of wool tuft and smoke flow.
Subjects Mechanical Engineering not elsewhere classified
Keyword(s) Drag
wind tunnel
yaw angle
rugby ball
flow
visualization
Copyright notice © ICME2011
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