American space agency Nasa has joined the growing list of critics
of the official World Cup match ball after subjecting the Jabulani
to a series of aerodynamic tests.
Analysis compiled by NASA’s Ames Investigation Centre experts, who
specialise in the field of aerodynamics, revealed that the Jabulani
becomes unpredictable at speeds in excess 44mph.
Further criticisms voiced by a host of World Cup players, before
and during the tournament, of the ball's inconsistent flight
patterns have been attributed to it's ultra light weight of
just 440 grams which makes it vulnerable to a force known as
the ‘knuckle effect’.
NASA also believe that the effects of altitude could have increased
the unpredictability of the ball with most stadiums in South Africa
at least 1,000 metres above sea level.
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