Hitting a cricket ball: what components of the interceptive action are most linked to expertise?

2011 ◽  
Vol 10 (4) ◽  
pp. 324-338 ◽  
Author(s):  
Juanita R. Weissensteiner ◽  
Bruce Abernethy ◽  
Damian Farrow
2015 ◽  
Vol 112 ◽  
pp. 196-201 ◽  
Author(s):  
Franz Konstantin Fuss ◽  
Batdelger Doljin ◽  
René E.D. Ferdinands ◽  
Aaron Beach
Keyword(s):  

Author(s):  
A T Sayers

The phenomenon of reverse swing of the ball in a game of cricket is achieved by very few bowlers, and then only by those who seem able to bowl at speeds in excess of 85 mile/h. It also seems that reverse swing cannot be achieved at will. Rather, it is obtained perhaps by accident as much as by design, its inception being as much of a surprise to the bowler as to the batsman. This would suggest that the flow conditions pertaining to reverse swing are extremely marginal at best. This paper investigates the flow conditions required for reverse swing to occur and presents data describing the lift and drag on the ball. While some direct measurements are made on a cricket ball for comparison purposes, the flow over the ball is modelled through a 2.7:1 scale ratio sphere. This permitted relatively large lift and drag forces to be measured. The results define the range of Reynolds numbers and seam angles over which reverse swing will occur, as well as the corresponding forces on the cricket ball. Flow visualization is used to indicate the state of the boundary layer.


Weather ◽  
1957 ◽  
Vol 12 (5) ◽  
pp. 140-146
Author(s):  
R. A. Lyttleton
Keyword(s):  

2006 ◽  
pp. 235-240
Author(s):  
David James ◽  
Matt Carré ◽  
Stephen Haake
Keyword(s):  

1929 ◽  
Vol CLVII (sep14) ◽  
pp. 195-195
Author(s):  
R. L. C.
Keyword(s):  

2019 ◽  
Vol 45 (1) ◽  
pp. 114-133 ◽  
Author(s):  
Joseph A Crawford ◽  
Sarah Dawkins ◽  
Angela Martin ◽  
Gemma Lewis

Increasingly poor and unethical decision-making on the part of leaders across the globe, such as the recent Australian Cricket Ball Tampering Scandal, pose a significant challenge for society and for organisations. Authentic leadership development is one strategy that has been positioned as an antidote to unethical leadership behaviours. However, despite growing interest in authentic leadership, the construct still embodies several criticisms including conceptual clarity; leader-centricity; bias towards the person, not the leader; philosophical ambiguity; and demographic challenges. Each of these criticisms will be explored in depth to inform a reconceptualisation of the authentic leader construct, comprising indicators of awareness, sincerity, balanced processing, positive moral perspective and informal influence. Importantly, this revised conceptualisation considers how researchers can conceptually distinguish between authentic leaders, followers and individuals. To conclude, we propose a research agenda for authentic leaders, encouraging the pursuit of further construct clarity, including the development of rigorous authentic leader behaviour measures, expanding the psychometric profile of the authentic leader construct, increasing the focus on authentic followers and enhancing leader development programmes.JEL Classification: M12


Author(s):  
C J Baker

While a number of past investigations have measured the aerodynamic forces on cricket balls, in general these forces have not been used to calculate the trajectories of balls between bowler and batsman. This article presents such a calculation. It begins with the full trajectory equations as developed for the study of debris flight in extreme windstorms, which are adapted for the cricket ball case. A collation of earlier experimental data is then presented for drag and side force coefficients on cricket balls. From these data, which show considerable scatter, a small number of generic force characteristics are derived for use in the trajectory equations. These characteristics have constant force coefficients in the subcritical and supercritical Reynolds number regions, and a transition between these two regions with a variable gradient. An approximate analysis of the trajectory equations results in very simple forms for the trajectories in the sub- and supercritical Reynolds number regimes, which reveal the governing dimensionless parameters of the problem, and enable the effect of crosswinds to be quantified. The predicted parabolic profiles are in agreement with some very simple calculations carried out by earlier investigators, revealing the limited range of validity of such calculations, and with the limited real bowling trajectories that have been observed. A full solution of the trajectory equations is then presented for the generic force coefficient characteristics, and a study of trajectories through the Reynolds number range is carried out. In the transition region between sub- and supercritical flows, complex ball trajectories are shown to be possible.


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