Americas Cup 37 about to commence

[flaming]

I am not talking about going that far but on the current width courses when they are doing 40+ knots it's less than 40 seconds of sailing time from when they round the gate to them having to tack / gybe at the boundary.

I think with the gates you already give the following boat the option to split at both ends of the course. When the breeze is up like it has been the last couple of days the downwind legs are already not far off 1 gybe legs. Make it much wider and you would not get any interaction downwind from top to bottom.

 

[Puffin10032]

6-4 to INEOS now.

 

[dunedin]

Brilliant day at the office for GBR today - well done Cup Spy: Brits go to Match Point on a grey day with a big seaway

 

[Chiara’s slave]

Brilliant day at the office for GBR today - well done Cup Spy: Brits go to Match Point on a grey day with a big seaway

I daresay the lads are quite familiar with grey days and big seaways.

 

[Buck Turgidson]

Stayed on the course and won the starts. It’s not rocket science. The excitement comes from wondering who will fall off the foils or break something. I don’t think there has been a lead change after leg 2 has there?

 

[DJE]

It’s not rocket science.

The design teams might take issue with that.

 

[bedouin]

In today's conditions INEOS has a small advantage in boat speed and that is enough for them to win both.

The next couple of sailing days are currently predicted much lighter and that make the races a bit of a lottery

 

[Chiara’s slave]

In today's conditions INEOS has a small advantage in boat speed and that is enough for them to win both.

The next couple of sailing days are currently predicted much lighter and that make the races a bit of a lottery

INEOS’s foils, contrary to what has been widely thought, are not optimised for the higher end windspeeds, they said yesterday. And in the very light stuff they seemed to have an advantage too. The light to medium airs, it’s all about threading your way though the shifts, and a modicum of luck. In the next 3 races, we should get lucky once, which is all that’s needed.

 

[Bobc]

Fingers crossed, butt cheeks clenched.

Come on boys!

 

[flaming]

INEOS’s foils, contrary to what has been widely thought, are not optimised for the higher end windspeeds, they said yesterday.

Yes, they did say that. For which audience did they say that I wonder.....

The details of what they do to mode the boats for wind and wave conditions are fascinating. If you look closely you can see that they run with very different cant angles on the foils for example. And the way they use different amounts of camber in the bottom of the main is also very interesting.

 

[Airscrew]

In many ways it's incredible that 2 teams working completely independently have produced two such incredibly evenly match boats.

The way this is playing out at the moment, whichever team wins is going to deserve it, but the other team is going to be going away with a real "what if" feeling. Both have made errors that cost them races.

I didn't think I'd enjoy watching the racing this cup all that much, but I'm completely hooked.

Yep. Completely hooked (pun intended). Close and competitive, and in terms of balance and control, racing right on the edge. Fascinating.

 

[Airscrew]

Perhaps someone here, maybe @flaming , could explain or offer a view on 'rudder immersion' (did they mean cavitation?), which has been in the commentaries from yesterday. The yachts appear quite agile / unstable in yaw, suggesting large momentary loads on the rudder.

And also thoughts please on the view(s) (eg from @mozzysails) that the INEOS hull seemed less likely to plug or stick in the taller wave conditions yesterday.

 

[flaming]

Perhaps someone here, maybe @flaming , could explain or offer a view on 'rudder immersion' (did they mean cavitation?), which has been in the commentaries from yesterday. The yachts appear quite agile / unstable in yaw, suggesting large momentary loads on the rudder.

And also thoughts please on the view(s) (eg from @mozzysails) that the INEOS hull seemed less likely to plug or stick in the taller wave conditions yesterday.

I think imersion is literally how far down in the water it is. Trade off is if it's deep there is extra drag, but if it's shallow there's less of it to actually steer the boat and more of a risk of the elevator breaking the surface in a wave, which would be all kinds of bad.

Mozzy's point was that Ineos's hull shape allowed them to get away with touches that cost LR huge amounts of distance.

 

[Airscrew]

I think imersion is literally how far down in the water it is. Trade off is if it's deep there is extra drag, but if it's shallow there's less of it to actually steer the boat and more of a risk of the elevator breaking the surface in a wave, which would be all kinds of bad.

Mozzy's point was that Ineos's hull shape allowed them to get away with touches that cost LR huge amounts of distance.

And is that because INEOS has more buoyancy forward, from the wider looking 'bustle'?? To bounce rather than stick??

 

[flaming]

I think so. But Mozzy was also making the point that dropping the bow in is often accompanied by a loss of rudder grip, and that the longer and deeper "keel/bustle" then helps resist turning whilst they get the flow on the rudder back and full control back. If that was always the design intention it's brilliant.

And should delight the souls of devout long keeler fans everywhere....

 

[ithet]

Looks like very light winds tomorrow (especially on ECMWF), we might have to wait until Sat or Sun!

 

[bedouin]

The winds are light but I suspect they will manage to get at least one race start (after all all they need is 5 minutes >6knts) whether it is a fair race or even finishes is another matter.

 

[Buck Turgidson]

nailed it.

 

[Chiara’s slave]

Pretty convincing there.

 

[Airscrew]

No luck needed there. Skill and commitment throughout the team. Good to witness little piece of history.