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INEOS AC75 update

Judders

Active member
Joined
19 Jul 2005
Messages
2,512
Location
Hampshire
In the old rules you had to sail there from your home port. It did rather give the defender something of an advantage.
 

Bobc

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Joined
20 Jan 2011
Messages
6,593
The new boat looks really interesting, and a departure from the out-and-out scow shape.

Looks like they've gone for something that looks not unlike an Axeman moth hull under the flat scow. I assume this is to give a "fast displacement" mode in between full displacement and foiling, and will also act to give a bit of buoyancy and stability through the turns. I wonder if it's also there to give a "mid-way" setting for lighter winds where they can't get properly foiling.

The Christmas race will be an interesting watch.
 

alex_m24

Member
Joined
27 May 2019
Messages
33
Location
The Clyde, Scotland
Any time I've managed to catch the racing these boats are foiling the whole race, the only time they touch down is when a mistake has been made.

I did wonder myself what the protrusion was there for though
 

Bobc

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20 Jan 2011
Messages
6,593
Any time I've managed to catch the racing these boats are foiling the whole race, the only time they touch down is when a mistake has been made.

I did wonder myself what the protrusion was there for though
Um, these boats have never raced yet. The first ever time you'll see them racing is in December.
 

RJJ

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Joined
14 Aug 2009
Messages
1,051
Um, these boats have never raced yet. The first ever time you'll see them racing is in December.
Yep, and they will only foil through the tacks at the upper end of the wind range. If your hull touches the water then the lower-drag hull form will lose less speed, and get back onto the foils earlier. Could be worth a boat length or two per tack. Clearly this is at the expense of aerodynamic drag and therefore ultimate top speed.

I think it's fair to say this was less of an issue with the cats, where the hull form was much more slippery in displacement mode?
 

Bobc

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Joined
20 Jan 2011
Messages
6,593
Yep, and they will only foil through the tacks at the upper end of the wind range. If your hull touches the water then the lower-drag hull form will lose less speed, and get back onto the foils earlier. Could be worth a boat length or two per tack. Clearly this is at the expense of aerodynamic drag and therefore ultimate top speed.

I think it's fair to say this was less of an issue with the cats, where the hull form was much more slippery in displacement mode?
That was my assumption for the "float underneath the hull" shape. Might also provide some early buoyancy and lift in the event of a nosedive to enable to boat to keep going and recover better, rather than just stopping.
 

savageseadog

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Joined
19 Jun 2005
Messages
21,693
Slight bit of thread drift.

Has Ainsley any background in crewed yacht racing? I thought most of his success came from solo dinghy racing, pardon my ignorance if I'm incorrect. I've always considered Ainsley to be a rather abrasive character and wondered if skippering a crew would be a problem for him.
 

dunedin

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Joined
3 Feb 2004
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6,482
Location
Boat (now back in) the Clyde
Slight bit of thread drift.

Has Ainsley any background in crewed yacht racing? I thought most of his success came from solo dinghy racing, pardon my ignorance if I'm incorrect. I've always considered Ainsley to be a rather abrasive character and wondered if skippering a crew would be a problem for him.
Not sure I would refer to the recent AC high speed foiling machines as “yachts”, but I would guess
- a couple of decades of being guest helm and/or tactician on top flight crewed racing yachts
- about a decade of sailing and skippering the high speed exotica - including being a winning tactician in an America’s Cup (unfortunately on a USA craft).
Not sure that any of the super league skippers are easy to sail with, but all of the small elite crew on board will be equally super focussed professionals.
 
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