How to measure speed of bowling?

[vaibhav_delhi]

on calculating, the horizontal components (cos theta) ratio for yorker and half pitched ball is very very close to 1. approx 1.01 => sq root(416/404) . Assuming Tht delivery point is 2meter high.

[Mariyam]

on calculating' date=' the horizontal components (cos theta) ratio for yorker and half pitched ball is very very close to 1. approx 1.01 => sq root(416/404) . Assuming Tht delivery point is 2meter high.[/quote'] :omg: :alberteinstein: ENGINEER ALERT!! ENGINEER ALERT!!!!

[Mariyam]

I'm also not a science person but I think its the speed when it has left the bowler's hand. Contact with the ground decreases the speed if I'm not wrong.

I thought the bounce gives the ball more speed and height. I was under the impression that contact with the ground increases the speed of the ball.

[gaurav92]

But how can one evaluate the difference in speeds after pitching, one on a grassy, damp surface, which skids on, and the other, on a slow wicket, which stops and holds a little after pitching ? How can the difference be evaluated ? or is it the speed at which it release out of the hand ?

[The Outsider]

on calculating' date=' the horizontal components (cos theta) ratio for yorker and half pitched ball is very very close to 1. approx 1.01 => sq root(416/404) . Assuming Tht delivery point is 2meter high.[/quote'] Factor in that the release point of the shorter ball would be slightly lower than that of the full ball. Also, there might be an optimal range of operation for the angles of these speed guns. I remember them showing the speed at delivery, upon impact with the ground, and when it reaches the batsman in a graphic and them mentioning that the normal speed we get to see is the one at delivery. The speed when reaching the batsman were much slower ~ 115-120 kmph for 130-135 kind of release deliveries.

[Sachin=GOD]

But how can one evaluate the difference in speeds after pitching' date=' one on a grassy, damp surface, which skids on, and the other, on a slow wicket, which stops and holds a little after pitching ? How can the difference be evaluated ? or is it the speed at which it release out of the hand ?[/quote'] it must be the speed at the release out of the hand because it is only at that point that the speeds will be uniform across different pitches. Otherwise as you say, after pitching, the speed will differ according to different pitches.

[vaibhav_delhi]

Do they? I wouldn't think so. I've seen speed guns clock the highest in England' date=' and the pitches there are certainly not quick.[/quote'] you could compare on different picthes within the same country. Say in australia, you would find speed guns showing more speeds in perth than say in melbourne. Anyways even mathematically, there is no greater ratio than 1.01 in horizontal components for a yorker and a half pitched ball which obviously doesn't explain the big difference in their speeds.

[vaibhav_delhi]

Factor in that the release point of the shorter ball would be slightly lower than that of the full ball. Also, there might be an optimal range of operation for the angles of these speed guns. I remember them showing the speed at delivery, upon impact with the ground, and when it reaches the batsman in a graphic and them mentioning that the normal speed we get to see is the one at delivery. The speed when reaching the batsman were much slower ~ 115-120 kmph for 130-135 kind of release deliveries.

I remember them showing akhter's release speeds over 100mph but average speed ie the actual speed arnd 95mph

[Raghav_12]

I also believe that speed guns show the speed at the time of release from bowler's hand. That's why you get to see almost uniform speed across the world. Coming to accuracy point, there is not a full proof method to measure bowling speeds and that's why speed records are not considered as official records. I have read and seen my self as well, that speed guns used in one or two series were showing relatively higher speeds for all the bowlers. WC 03 being one of them (Otherwise how you can explain Nehra bowling at 149 kmph :-)). I have also read about one Pakistan tour to SA in 90's, where almost everybody was clocking 140+. After that series people had raised questions on the accuracy of speed guns.