The Groundsman

August 2014

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TECHNICAL UPDATE 17 the Groundsman August 2014 Visit www.iog.org for more information and digital editions Pitch profile and ball bounce These examples show how pitch profile is critical in ball bounce. Identifying pitch problems and taking the right steps to rectify them can help pitch performance. Well-prepared, hard pitch with a good profile As the ball impacts with the surface, there is only very small deflection of the surface causing the ball to compress – storing the energy of the impact in the ball. As the ball rebounds from the surface, the surface rebounds returning its energy to the ball and the ball recovers its shape, meaning that there is maximum energy returned to the ball during rebound, maximising pace and bounce. Profile with thatch As the ball impacts with the surface, there is a larger deflection of the surface meaning more energy is transferred to compressing the thatch. Although the thatch is elastic and will recover – it does this relatively slowly and by this time the ball has gone. This reduces the energy stored in the ball and transferred back to the ball, slowing it down and potentially reducing bounce. Excessive thatch will lead to low-slow pitches. t

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