Someone said they were dumping ballast from the LEEWARD hull at one stage in the second race on the reaching legs - perhaps to gain more buoyancy and lift that fairly well immersed hull up to reduce drag, maybe. Or maybe to lighten the boat so the windward hull flew more steadily, without dumping. This may just be gossip. In the first race they dumped a huge quantity from the windward one when doing the downwind leg, when the wind lightened - and from then on A5 held the gap between BMW-O steady. The real difference between the two boats was that BMW-O could crank far more power into their wing main and although A5's looked better than the flat board used in race 1, it was still very flat - and that would not have helped their hull balancing tight rope act either. It would be fascinating to see a compiled research of the two boats logs? in a book - if ever they allow that information to be released. It would be a good seller to those who want to be enlightened - and who are just guessing and surmising at the moment.