Well Brett, Reverse Swing was in earlier time considered a cricket myth that was heard but never seen until Pakistani Numero Uno's brought it to fore front with Sarfraz Nawaz founding it and then Imraan Khan perfecting it, it became one of the most sought after art in cricket's fast bowling department.
In itself it is the art of reversing an old ball due to the assymetry of the balls two side, which was considered to be possible with only new and polished bowl, but here a fairly old bowl is also made to do tricks. Normal swing occurs mostly when the ball is fairly new. As it wears more, the aerodynamics of the asymmetry change and it is more difficult to extract a large amount of swing.
When the ball becomes very old—around 40 or more overs old, it can begin to swing towards the polished side rather than the rough side. This is known as reverse swing In essence, both sides have turbulent flow, but here the seam causes the airflow to separate earlier on one side. The result is always a swing to the side with the later separation, so the swing is away from the seam.
Answered by
Shreshtha
, an ibibo Master,
at
12:01 AM on October 03, 2008