"They are pretty fragile boats; you need to be quite careful."
Ashby finished second (one win, two seconds) and Andrew Landenberger rounded out the top three. Tuke and Chris Nicholson had unhappy days, both withdrawing midway through with gear failure.
However Burling was also quick to downplay the significance of his success.
"This isn't the week you really want to win," laughs Burling. "It would be a lot nicer to win next week when the world title is on the line."
The A Class world championships start with a practice race tomorrow. Two races a day are scheduled through to next Saturday, with one on the final day (Sunday).
In total there are eight entries from Emirates Team New Zealand in the world championships. As well as Burling, Tuke, Nicholson and Ashby, Ray Davies and three members of the design team (Pete Melvin, Luc Dubois and Nat Shaver) are all competing. Another big name is Australian Olympian and member of the 2013 Artemis America's Cup campaign Nathan Outteridge.
Dean Barker was a late scratching, choosing to withdraw from the world championships to concentrate on Team New Zealand's preparation for the Extreme Sailing Series which starts later this month. In all there are 11 countries represented, Britain, United States, Canada, Spain, Netherlands, Poland, Germany and Switzerland.