It's Americas Cup Time Again.

Well, all of the boats are now out and doing their thing.

All the boats are superficially similar, but when you get into the detail are surprisingly diverse.

I'm not that impressed by the British Boat. It looks heavy on the water and seems not to want to get on the foils as easily as other contenders. From the increased volume up front compared to the others, I assume they envisage sailing in heavier swells than the previous competition. The British boat's bow fulfils the volume requirements by having a broader skeg than most after the actual bow. Just aft of the bow there is quire a widening of the skeg area. The designer seems to have designed the skeg to cut off airflow under the hull. But not as drastically as the Swiss Alinghi/Red Bull boat. From the videos I've seen the British Ineos boat looks heavy and the skeg looks pretty much glued to the water. From videos it looks sadly as though the hull has an issue getting off the water. Did I say it looks heavy? Maybe it's nickname should be Beefy. Maybe this season's race foils will work better. Not sure why they put a skeg on it that finished almost half way down the boat towards the rudder, especially as the rudder area isn't close to the water. Instead the hull looks nose-heavy or runs in nose-down trim.

The most fair-weather design looks to be the American team. A very flat t-shape through most of the length of the hull, with a small skeg. They've fulfilled the volume required in the bow by the regulations by putting the volume up high but wide. In swells I assume they've gone for the option of getting on the foils quickly and riding the hull over the waves, rather than having part of the hull touching the waves. Certainly it already looks a light, fast boat. It certainly looks fast and light. Interestingly they've gone for recumbent cyclors I assume to get the height of the hull down. Did I say it's a very flat design? 

The Italians with Prada Pirelli, is a nice looking boat and again it looks fast and light. A deeper skeg than the American boat, but it seems to have some of the smoothest curves of the boats. I assume for aerodynamics. But nothing much aero-wise on the top of the hull. The depth of the hull is about average. Not much more to say. It seems to foil easily from videos I've seen.

The New Zealand boat seems to be in the bunch With Prada Pirelli and Ineos. However the Kiwis got the boat on the water in a matter of hours. No pussyfooting around, they were on the water and sailing straight away. Such was their confidence in the boat. And it worked pretty well. The advantage that boat has is definitely the crew. But will that be enough?

Now we get to the Swiss Alinghi/Red Bull boat. Probably the most radical in my eyes. It's not an iteration of a previous design, it's pretty much a one-off. Quite a deep design with a thin skeg, Possibly the skeg is there to block off the wind and give the hull lift. The top of the hull has had some aero work as well, with a hump under the jib. Nobody has yet figured out it's purpose yet, but as with most aero bits, it must be to change the wind speed in that area.

The differences on the boats is interesting. Most have similar lower forms to the hull as American Magic, but the upper decks are slightly different to accommodate the more upright grinders.

It saddens me that the Brit boat looks clumsy in videos I've seen. Maybe the proper foils will change that. 

American Magic looks to be the best of the contenders at the moment. But it depends on the wind and wave conditions they race in. 

I'll be watching them when they get their final race trim bolted on and dialled in. Then things might change.