America's Cup catamarans training Feb 2015

I was fortunate to get out sailing on a F27 in San Francisco bay when the America Cup foiling 45fters were also out practising. It is very hard to video boats moving at 35knots when you are only doing 12-14 and don't know where they are going or when they will tack. And having to sail at the same time, not just video. So this video is just to show we were there with them on a glorious, sunny winters day For the record, both boats need to practise their tacking a lot more. Artemis seemed to fly higher but sail slower than Oracle. And what causes the high pitched whine before they sail fast (hydraulics?) Thanks Charlie!