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Off Topic - America's Cup Sailing - Foiled Monohulls

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Hugh2
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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Hugh2 » Wed Jul 15, 2020 9:09 pm

The foiling IMOCAs are amazing, imagine trying to sleep, alone and exhausted, in the middle of the southern ocean and roaring forties while racing as fast as you possibly dare. Check out the Charal videos here, she just won their latest race yesterday.

https://www.sail-world.com/news/210446/ ... al-foiling

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Kite Runner » Thu Jul 16, 2020 4:50 pm

These are pretty cool, but I bet the foils are computer controlled... does anyone know? If they are, then unfortunately this technology will likely never make it to mainstream boats. It's like watching a life-sized science experiment.

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Hugh2 » Thu Jul 16, 2020 7:49 pm

As far as I know, the new IMOCA 60 foils have to be adjusted manually by the sailor, and allow only 5 degrees of adjustment to rake and angle of attack.

This article indicates that the same is true for the new AC75 boats, although teams have tried various ways around this restriction.

https://www.yachtingworld.com/americas- ... ems-124434

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Dave_5280 » Fri Jul 17, 2020 2:24 am

Nice video and article by Andy McLean from the New Zealand team:

https://www.ineosteamuk.com/en/article ... Tk_FJH2cwg

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby davesails7 » Fri Jul 17, 2020 2:57 am

Kite Runner wrote:
Thu Jul 16, 2020 4:50 pm
These are pretty cool, but I bet the foils are computer controlled... does anyone know? If they are, then unfortunately this technology will likely never make it to mainstream boats. It's like watching a life-sized science experiment.
I don't think so. I think when they foil too high, more of the foil comes out of the water, and it drops back down. It regulates itself by how much of the foil is in the water.

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Hugh2 » Mon Jul 27, 2020 4:32 pm

davesails7 wrote:
Fri Jul 17, 2020 2:57 am
Kite Runner wrote:
Thu Jul 16, 2020 4:50 pm
These are pretty cool, but I bet the foils are computer controlled... does anyone know? If they are, then unfortunately this technology will likely never make it to mainstream boats. It's like watching a life-sized science experiment.
I don't think so. I think when they foil too high, more of the foil comes out of the water, and it drops back down. It regulates itself by how much of the foil is in the water.
Correct, Dave, that's the fundamental design feature, but the new IMOCA rules also allow slight manual adjustment of the foils by the sailor. And take a look at the monster foils on this IMOCA.


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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby neilhapgood » Mon Jul 27, 2020 8:55 pm

is it intentional that the foils don't bring the boat right out the water but provide some lift?

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Hugh2 » Mon Jul 27, 2020 9:25 pm

neilhapgood wrote:
Mon Jul 27, 2020 8:55 pm
is it intentional that the foils don't bring the boat right out the water but provide some lift?
Yes, for the sake of control. The foil both reduces the wetted surface to increase speed, and more importantly increases righting moment to allow more sail area.

Much discussion in IMOCA about the next set of rules for the next generation of boats (pretty much every 4 years for each Vendee Globe race). There is discussion of allowing T-foils on the rudders, which would allow them to fly higher and under control, plus automated foil controls to allow the same. Much will depend on experiences in this year's Vendee, which starts early November. Many are already worried that these current boats will be very hard to push near the limits for days on end in the southern ocean as the combination of rough motion and loud noise is debilitating.
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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby ieism » Thu Jul 30, 2020 7:55 am

Pierrot wrote:
Mon Jul 13, 2020 12:17 am
If you enjoy the cup you should read “ The Billionaire and the Mechanic”. Awesome - true - story of the Oracle racing challenge. And the birth of foiling AC boats.
Thanks, I enjoyed reading that a lot.

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Re: Off Topic - America's Cup Sailing - Foiled Monohulls

Postby Bille » Sat Aug 01, 2020 4:23 pm

Hugh2 wrote:
Thu Jul 16, 2020 7:49 pm
As far as I know, the new IMOCA 60 foils have to be adjusted manually by the sailor, and allow only 5 degrees of adjustment to rake and angle of attack.

...
5-deg would be more than enough ; if they allowed a wing on the rudder.
neilhapgood wrote:
Sun Jul 12, 2020 6:27 am
interesting as a cat is always quicker than a mono hull without a foil, does a foil remove the advantage?
I think at that speed ; it's all about wetted aria , and the 75's are faster , because
of it ?

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