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Science of Swing

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Science of Swing The science of swing James Anderson’s ability to so it acts as a rudder. Contrary to Weather report Pitch report Sultans of swing swing the ball could decide cricketing lore, however, the • Experiments show that, • Grassy wicket: can protect shiny side the fourth Test at weather will not be a factor: contrary to popular cricketing of ball, assisting conventional swing George Hirst belief, cloud cover and humidity • Abrasive wicket: can scuff up ball, • England, 24 Tests, 59 Headingley. His success will science suggests that none of the seem to have no effect on swing creating rougher rough side and depend on manipulating three types of swing are affected wickets at 30.00 • Prevailing winds can disrupt promoting reverse-swing aerodynamics and creating subtle by cloud cover or humidity, turbulence patterns on the ball, • Very hard wicket: can depress seam, pressure imbalances on either side although pitch conditions and promoting swing in particular making conventional or reverse swing Bob Massie of the ball, by positioning the seam wind can make a difference grounds or from a particular impossible. Contrast swing may still be • Australia, 6 Tests, 31 bowling end effective wickets at 20.87 Richard Hadlee • New Zealand, 86 Tests, 431 Normal Reverse Contrast wickets at 22.29 swing swing swing Waqar Younis • Pakistan, 87 Tests, 373 wickets at 23.56 Zaheer Khan • India, 65 Tests, 210 wickets at 33.84 1 The grip 1 The grip At low speed At high speed Bowler holds ball next to seam, with part of Bowler holds ball next to seam, with part of shiny side towards batsman, and points rough side towards batsman, and points seam in direction he wants the ball to swing. seam in the opposite direction to the way he 1 The grip 1 The grip For an outswinger, the seam points towards wants the ball to swing. For an outswinger, Bowler holds seam vertically, with Bowler holds seam vertically, with shiny slip, for an inswinger towards fine leg the seam points towards fine leg, for an rough side facing the way he wants side facing the way he wants the ball to inswinger towards slip the ball to swing swing Ball swings in Ball swings away Ball swings in Ball swings in the from the direction the direction of direction of the direction in which the seam the rough side shiny side in which is pointing the seam BALL DIRECTION is pointing 2 Rough surface of ball creates BALL DIRECTION Air initial turbulence on both sides of Air 2 the ball Air moves 3 2 As air hits As air flows smoothly over 2 rough side of around the ball, smooth side, 3 High speed the ball, it is disrupted but rough side As turbulent air creates initial turbulence is on the side with creates turbulence hits the seam, BALL DIRECTION disrupted and the seam, turbulence BALL DIRECTION turbulence is on both sides weakened causing disrupted and of the ball turbulence weakened Rough L Smooth side o w side e Smooth Rough L Smooth Rough r o p Rough side w side side e side r Smooth r e e side u e r s side s r s p s u u r e s e r r e s s p s e u r r r e p e w r 3 o e Turbulent air 4 L 3 w Weakened Turbulent air o breaks away L 4 turbulent air breaks breaks away Weakened turbulent from the ball away from the ball from the ball air breaks away from later, reducing earlier, raising later, reducing the ball earlier, raising pressure on pressure compared pressure on pressure compared that side with the other side rough side with the other side 70mph optimum speed 90mph optimum speed 70mph optimum speed 80mph optimum speed Swing difficult to achieve above 80mph Roughened balls will reverse at lower speed Faster balls swing the other way Ball still swings if seam is less prominent.
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