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Cricket in Full Swing

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Cricket in Full Swing CAN YOU ADV REVIEW on the inside Believe it? Cover Story WITH ASSOCIATE PROFESSOR DEREK LEINWEBER Should it stay or should it go? Pages 4-5 Cricket in full swing DATE: Can the Festival Centre stay relevant? There’s a third way to make a Bend it like Blewett 2-DEC-2006 Design cricket ball move in the air. In the contrast swing the seam OU’RE standing at the stumps and the of the ball is delivered straight Sole searching bowler has just released the ball. You down the pitch. note the seam is oriented straight down Pages 6 the pitch and it looks like the ball will At moderate pace, a dimpled Shoes can signify social status, occupation, even be wide. But in the last moment the roughness will trip turbulence sexuality. ball swings in and hits the stumps. and make the ball swing to the PAGE: YWhat happened? It’s not conventional swing. rough side. It’s not even reverse swing. It’s contrast swing. Any Australian kid who has ever shaved half A furry sort of roughness will Visual arts a tennis ball or wrapped half a tennis ball with make the ball swing towards W-2 smooth electrical tape has played with contrast the smooth side. swing. But how does it work? All fired up Those wrapping half a tennis ball with electrical The little rubber nubs at the tape often talk about loading one side of the ball leading edge of the smooth ED: Pages 14-15 to make it heavier. And while this is true, it has side of the Swing King ball are The introduction of pottery at Ernabella has given the nothing to do with making a ball swing to the just the thing to help STATE acclaimed arts centre new impetus. side as it travels through the air. Loading the ball trip the airfl ow into does not induce swing. turbulence on All swing bowling techniques rely on setting up the otherwise an asymmetry in the way air flows around the smooth side Films of the ball, COL: ball. And it’s the surface texture and seam orientation that play the key roles. suctioning a In conventional swing, the seam is oriented reverse swing Shining bright away from the C about 20 degrees to the side and trips the smooth Page 18 airflow into turbulence. This enables the air flow fuzzy side. M Dakota Fanning tells how she won’t become another to hug the contour of the ball on the seam side. The smooth airflow on the opposite polished Y burnt-out child star. pace, a dimpled roughness will trip turbulence and side of the ball does not hug the ball. Rather it make the ball swing to the rough side, similar K separates from the ball about half way around. to that of conventional swing. On the other hand, And because the air flow next to the ball speeds a ‘‘furry’’ sort of roughness will deflect the airflow, Travel up to follow the longer contour of the ball, this as in reverse swing. The ball will swing away from air flow is at low pressure. Thus, in conventional the rough side, towards the smooth side. swing, the turbulent air flow hugging the ball It is this latter scenario that works for the half- suctions the ball to the seam side. Casinos and cowboys smoothed tennis ball. The furry side acts like the In reverse swing, the ball is delivered at high seam in reverse swing, deflecting the air flow away Pages 24-25 speeds, setting up turbulent flows on both sides from the ball’s surface. On the relatively smooth Known for 24-hour casinos and tacky weddings, Las of the ball. This time the seam acts as a ramp side, the bumps in the edges of the electrical tape, Vegas is also a haven for adventure seekers, on one side, deflecting the air flow away from or any remaining roughness left after shaving is shop-aholics and art lovers. the ball’s surface on the seam side. The low- just enough to trip turbulence and keep the low- pressure turbulent air hugs the other side and pressure air flow next to the ball on the smooth swings the ball in reverse, away from the seam side. The ball reverse-swings to the smooth side. side. The Advertiser Review But in contrast swing the seam of the ball is Ask a professional swing bowler like the Published every Saturday by Advertiser Newspapers Pty Ltd, delivered straight down the pitch. This time one Redbacks’ Sean Tait or Greg Blewett to bowl a 31 Waymouth St, Adelaide. relies completely on a carefully managed wearing half-smoothed tennis ball and you’re in for a Editor: Simon Wilkinson of the ball through the overs. surprise. The effect is not at all subtle. At Editorial team: Hamish Cooper, Ben McEachen, Patrick McDonald, The tradition of keeping one side polished and moderate pace, the ball swings to the side by 3m Jessica Hurt, Chris Brice, Ian Orchard, Deborah Bogle. smooth while allowing the other side of the ball or more. Crazy! Production: Ian Orchard, Carolyne Jasinski, Dianne Mattsson, Tania to rough up at every opportunity is absolutely key Derek Leinweber is an AssociateProfessor of Physics Bawden, Chris Oaten, Hugh Polkinghorne. to creating any swing at all. Determining which atthe University of Adelaide and DeputyDirector Designers: Andrew Popescu, Candi Pearson. way the ball will swing is tricky as it depends on (Visualisation)ofthe SouthAustralian Partnership for Cover: Andrew Popescu. the nature of the surface roughness. At moderate Advanced Computing (SAPAC). 200 double in-season tickets to be won! AS DARKNESS FALLS THE LAST DRAGON WILL CHOOSE ITS RIDER DECEMBER 2, 2006 REVIEW To enter go to news.com.au/adelaidenow Competition opens 12.01 am Saturday December 2, 2006. Entries close 5pm Tuesday December 5, 2006 ONLY AT THE MOVIES! DECEMBER 14 THE ADVERTISER 2 To enter, readers simply need to register online to win the double passes. The promoter is Advertiser Newspapers Pty Limited. The draw will be conducted at Advertiser Newspapers Pty Limited, 31 Waymouth Street, Adelaide on Wednesday, 6 December 2006, at 9 am from all entries received during the promotional period. All winners will be notifi ed by mail. Each double ticket is valued at $30.00. Total prize value $6,000.00. Please refer to the classifi ed index today for Advertiser Newspapers Pty Limited Privacy Policy and Public Notices for Conditions of Entry. SA Lic T06/5133.
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