Bryony Shaw is the defending champion on Chinese waters after winning the Olympic test event in the light airs of Qingdao in 2007.
"It was a convincing win. I really feel I can beat anyone when the conditions are like that," she said.
The 24-year-old from Weymouth, who is competing in her first Olympics, has lost three kilos for the Games, which might explain her disappointing eighth-place finish in this year's World Championship held in strong winds in New Zealand in March.
She failed to qualify for the Athens Games when the windsurfer class used longer, thinner Mistral boards, but with the introduction of the shorter, fatter RS:X, Shaw has thrived.
Her biggest rivals are likely to be Athens gold medallist Faustine Merret, who won the 2006 test event, Athens bronze medallist Alessandra Sensini, who won the Worlds this year, and New Zealand veteran Barbara Kendall, 40, a former Olympic champion who is competing in her fifth Games.
The women's RS:X class begins on 11 August and finishes on 19 August.
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