On Marsh, you say his deliveries mentioned all swung with the same curvature which is predictable due to the fact the ball condition was the same, seam was the same and speed was the same, but earlier you say that that the swing distance for a given curvature doesn’t depend on delivery speed. Confused!
That's a really good question, and something I will definitely talk about in the future!
The bowling speed affects the aerodynamics which generate a given Swing Coefficient (or Curvature). However, two deliveries with the same Swing Coefficient value will swing the same amount, even if their bowling speeds are different. It's subtle distinction, but hopefully makes sense?
The exact relationship between the release speed and the generated swing is a bit more complicated, but I will hopefully write about it soon.
So swing coefficient is the interplay of factors like seam cant, ball condition & speed. So if two balls of different speeds have same swing coefficient, then one of the other factor has been altered and compensates to ensure same swing coefficient, right?
So practically it would be chaotic & overwhelming to correlate & keep track of these parameters while tracking every ball but if an automated tool is built to track, calculate the parameters and provided us with Cs, then it will make sense to the viewer to correlate the event, the science and the pattern over a set of deliveries, right?
So do you have any plans to execute such a tool & create a database maybe?
On that first point, you can have the same Cs value at different speeds (the relationship is flat at parts and non-linear at others) which you can see if you hit the link to our paper in a later post. It's not necessarily a case of other factors compensation, just the aero state being stable at a variety of speeds/ball conditions etc.
And yes, I do have a swing prediction tool based on all of the physics! Sadly we don't measure seam cant and rotation rates yet, but I'm hopeful we will soon, and the tool will have better inputs to go with ball tracking data.
Thanks! Looking forward to the tool measurements in the upcoming ind aus series, hope we get to see your tool in ops/inferences.
One last question, why does the backspin rate matters in swing? Apart from providing directional stability, why is there an optimum zone as mentioned by Dr Rabi Mehta
Nice article! Quick question...
On Marsh, you say his deliveries mentioned all swung with the same curvature which is predictable due to the fact the ball condition was the same, seam was the same and speed was the same, but earlier you say that that the swing distance for a given curvature doesn’t depend on delivery speed. Confused!
That's a really good question, and something I will definitely talk about in the future!
The bowling speed affects the aerodynamics which generate a given Swing Coefficient (or Curvature). However, two deliveries with the same Swing Coefficient value will swing the same amount, even if their bowling speeds are different. It's subtle distinction, but hopefully makes sense?
The exact relationship between the release speed and the generated swing is a bit more complicated, but I will hopefully write about it soon.
So swing coefficient is the interplay of factors like seam cant, ball condition & speed. So if two balls of different speeds have same swing coefficient, then one of the other factor has been altered and compensates to ensure same swing coefficient, right?
So practically it would be chaotic & overwhelming to correlate & keep track of these parameters while tracking every ball but if an automated tool is built to track, calculate the parameters and provided us with Cs, then it will make sense to the viewer to correlate the event, the science and the pattern over a set of deliveries, right?
So do you have any plans to execute such a tool & create a database maybe?
On that first point, you can have the same Cs value at different speeds (the relationship is flat at parts and non-linear at others) which you can see if you hit the link to our paper in a later post. It's not necessarily a case of other factors compensation, just the aero state being stable at a variety of speeds/ball conditions etc.
And yes, I do have a swing prediction tool based on all of the physics! Sadly we don't measure seam cant and rotation rates yet, but I'm hopeful we will soon, and the tool will have better inputs to go with ball tracking data.
Thanks! Looking forward to the tool measurements in the upcoming ind aus series, hope we get to see your tool in ops/inferences.
One last question, why does the backspin rate matters in swing? Apart from providing directional stability, why is there an optimum zone as mentioned by Dr Rabi Mehta