Question

How to calculate the angle of deviation or inswing and outswing dileveries in cricket bowling when provided with a rpm?

Answer 1

I hope this collage explains your doubts!doute if its useful!

Normal swing Reverse swing 1 The grip 1 The grip Ball 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 For an outswinger, the seam points towards wants the ball to swing. For an outswinger. slip, for an inswinger towards fine leg the seam points towards fine leg, for an inswinger towards slip swings in Ball swings away the from the direction direction in which the seam in which is pointing the seam is pointing 2 Rough surface of ball creates Initial turbulence on both sides of the ball As air flows around the ball. 3 It is disrupted As turbulent air on the side with hits the seam, the seam. turbulence is causing disrupted and turbulence weakened Rough Smooth side side Rough side Smooth side BALL DIRECTION 2 BALL DIRECTION 3 Turbulent air breaks away from the ball later, reducing pressure on that side 4 Weakened turbulent air breaks away from the ball earlier, raising pressure compared with the other side 70mph optimum speed 90mph optimum speed Swing difficult to achieve above 80mph Roughened balls will reverse at lower speed