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SWINGA Cricket

HOW TO SWINGA

SWINGA™ creator Aaron Lilly takes you through some quick tips to get your new SWINGA™ Technique Ball swinging through the air like the best of them!
Watch the video to learn how to bowl both inswingers and outswingers, by hand and with the flinger. Also, because the SWINGA™ Technique Ball behaves and reacts like a regular cricket ball, you can also bowl spin just like normal!

The Science of Swing

If you've used the SWINGA, you may notice that the ball will tend to swing away from the shiny side (conventional swing) when it is thrown or bowled at a slower pace, but swing towards the shiny side (reverse swing) when bowled or thrown at a higher pace. I'm no physicist, so when creating the SWINGA I wanted to understand the physics of this behaviour. 

So I reached out to my good friend Dr Callum Shakespeare (PhD (Cambridge 2015), BSc Hons (ANU 2011), BSc (UWA 2010)) who is a fellow/senior lecturer at the Australian National University and has worked with the Climate and Fluid Physics Research Group since 2015. 

He has shared some thoughts on why the ball behaves the way it does:

"I think that behaviour makes sense because there are two types of drag you have to think about: (I) laminar flow and viscous drag, which applies when things are moving slowly and (ii) turbulent wake and drag, which applies when things are moving fast (more scientifically fast vs slow is quantified in terms of the Reynolds number). The interesting thing about the two drags is they will act in opposite ways on the two sides of the ball. The dimpled side will have a bigger laminar viscous drag ( because it is rougher) but a smaller turbulent wake drag (because the flow detachment occurs further towards the back of the ball; this is the golf ball effect). And the path of the ball will tend to move towards the side that experiences the larger drag, because that side is slowed down relative to the other. Thus:

throw it slowly, laminar drag dominates, and ball moves towards rough side.Throw it fast, turbulent drag dominates, and ball moves towards the smooth side."

There was also a great study done by Rabindra Mehta (sports aerodynamics consultant and NASA scientist) explaining the three forms of swing: conventional, reverse and contrast. This also may explain why the ball behaves the way it does - which is pretty cool! 

Click here to view the study. 

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