Alinghi Challenge AC37

barfy

Super Anarchist
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Actually, all their cute diagrams from early on show that it was self righting with both foils down. That’s the case with Alinghi.
Well, I don't have my polarized glasses on, could be the starboard arm is all the way up, making things awkward.
Edit I see both foils down in the latest pic
 
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Terry Hollis

Super Anarchist
Really? surely fully down is maximum self righting moment, as if it were a keel.

stating the obvious clearly, but for a point of discussion - my little sketch of a much more complicated scenario with the orange up arrow the fulcrum of sorts. The simple concept is that the boat should come back up under these conditions if there's no breeze. Throw windage on the mast and there's a threshold where it won't self right. it just looks like they were out beyond that limit. and then once water gets into the hull it changes everything.

View attachment 538322

would be nice to know how long it took to right, and how it was achieved.
Fully down foils provide maximum stability when the vessel is stationary. At the time of the capsize they were being towed so they should of had the foils set in position for them to fly.
 

yoyo

Anarchist
787
346
would be nice to know how long it took to right, and how it was achieved.
The team HSV was quickly dispatched to the scene and was able to render assistance, righting the vessel, rescuing the crew and bringing the vessel back to port safely with zero emissions...
1662131473224.png
 

Monkey

Super Anarchist
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Fully down foils provide maximum stability when the vessel is stationary. At the time of the capsize they were being towed so they should of had the foils set in position for them to fly.
But it appears they’re both fully down. They very well may have set them in that position after the knockdown.
 

Nauti Buoy

Member
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But it appears they’re both fully down. They very well may have set them in that position after the knockdown.
Then as soon as they were in that position, it should have self righted given the sales pitch. Also, it was supposed to self right with sails up. Sails were down, which is also unlikely that they were towing it with one arm up. As we saw last cycle when towing they would have both down.
 

Stingray~

Super Anarchist
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PNW
The intent in the V1 Rule was for them to be self-righting, presumably to be able to finish a race legally, but everyone went with support boats whenever it happened.

From the link below they also suffered damage to the hull, something I don't think we have ever seen before in the several previous capsizes, AM aside. bold mine,

"Alinghi Red Bull Racing's BoatZero suffered minor damage to the port foil arm and to the hull. We will be back on the water soon, carrying on with our preparation for the 37th America's Cup." says Silvio Arrivabene, Co-General Manager of Alinghi Red Bull Racing."

 

Sea Breeze 74

Anarchist
947
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NZL
Wow. Looks like a, Wellington NZL southerly rolling in.
My thoughts exactly. I remember a kite run heading south down Evans Bay many years ago. We were a group of three about a leg ahead of the pack and we see them coming towards us ... spinnakers up and out of control! It was a brutal north to southerly flip flop. Glad I wasn't on the bow that day. Still got a scar on my index finger from a winch jam :)
 

Sailbydate

Super Anarchist
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Kohimarama
My thoughts exactly. I remember a kite run heading south down Evans Bay many years ago. We were a group of three about a leg ahead of the pack and we see them coming towards us ... spinnakers up and out of control! It was a brutal north to southerly flip flop. Glad I wasn't on the bow that day. Still got a scar on my index finger from a winch jam :)
Ha, ha. Yeah, mate. Been there...done that. (y)
 

dogwatch

Super Anarchist
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South Coast, UK
Wow. Looks like a, Wellington NZL southerly rolling in.

Don't know much about weather in Wellington but https://blog.metservice.com/Windy-Wellington suggests strong southerlies tend to be driven by depressions. I'm sure there are those here who can put me straight if that is wrong.

By contrast, here is a surface level chart for Europe on Thursday 0000. I think the sinking was some 12 hours earlier, this is as close as I can find https://apps.ecmwf.int/webapps/open...ion=opencharts_europe&valid_time=202209011200 You can see pressure over Spain is slack, no depressions. That is common this time of year. I imagine what hit them was a downburst from a thunderstorm, which can travel a considerable distance. We had such a downburst here a couple of weeks ago, all quiet followed by windows and doors rattling for 45 minutes, then quiet again.
 
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