do a 65 knot average and start cavitating at pretty much what its maximum speed turned out to be. We didn't get a chance to do another run with the boat optimised to see if we could have nudged it over 70 knots. I think we probably could have, but who knows? We might have been hitting the brick wall at that point already - like we had done previously at 52 knots. We still don't have all the answers. We have seen that what I would call a conservative foil works. But there are still some tricks that we hadn't tried. Things that were unknown like how well it was ventillating down the foil, we now have well calibrated sensors down there so that we have real hard numbers. The velocity prediction programme has been running since the first boat and was modified for the second boat, so that has been going on since 2004. That is starting to be a pretty complex equation including wave and spray drag and all sorts of other data in it. Those are the really powerful tools that we can carry forward into the next boats.


July 2013


61


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