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Old 20-11-2018, 08:43   #1
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What Kind of Rig is This?

Itís on a Cat, seems to be dual masts that are very high aspect airfoils, with what looks to be trim tabs on the trailing edge, and they must be able to rotate.
There are dual self tacking jibs also that I have to think contribute the majority of sail power?Click image for larger version

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Old 20-11-2018, 09:03   #2
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Re: What Kind of Rig is This?

Is this it?

https://www.chriswhitedesigns.com/a47-mastfoil
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Old 20-11-2018, 09:10   #3
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Re: What Kind of Rig is This?

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Yep. I knew the moment I saw it that it was a Chris White. I drool over those boats...
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Old 20-11-2018, 09:45   #4
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Re: What Kind of Rig is This?

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Yep. I knew the moment I saw it that it was a Chris White. I drool over those boats...
As a matter of interest, what is the verdict on this rig? Been reading what I can find about it, seemed to hold a lot of promise, but then it all went a bit quiet? Great admirer of the boat, the designer, but did this aerofoil rig arrive at some consensus conclusion?
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Old 20-11-2018, 09:59   #5
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Re: What Kind of Rig is This?

It's a Chris White Cat. Met a guy and his wife who had just picked theirs up in Columbia, if I remember correctly. They were taking it up to the NE. It's a mast foil rig, and he raved about how efficient it was. Nice cat, well made with lots of good ideas...
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Old 20-11-2018, 10:42   #6
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Re: What Kind of Rig is This?

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As a matter of interest, what is the verdict on this rig? Been reading what I can find about it, seemed to hold a lot of promise, but then it all went a bit quiet? Great admirer of the boat, the designer, but did this aerofoil rig arrive at some consensus conclusion?
Looks like #12 is under construction in Chile at Alwoplast.
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Old 20-11-2018, 12:09   #7
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Re: What Kind of Rig is This?

Nice cat but prone to capsizing, if I remember right and also regarding the #a built. I think this is the toll you have to pay for the performance.
Sorry nothings against, I admire them but as a singlehander she is out of my reach. (As the grapes in La 'Fontaineīs story).
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Old 20-11-2018, 13:44   #8
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Re: What Kind of Rig is This?

The rig looked heavy, and I wondered about stability
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Old 20-11-2018, 13:57   #9
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Re: What Kind of Rig is This?

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Nice cat but prone to capsizing, if I remember right and also regarding the #a built. I think this is the toll you have to pay for the performance.
Sorry nothings against, I admire them but as a singlehander she is out of my reach. (As the grapes in La 'Fontaineīs story).
I haven't heard of any 47's that had capsized, there was an early issue with the masts that has been taken taken care of as far as I know.
The 57's a different design altogether, had 2 that capsized 1 was admittedly the captain's error, the second was most likely caught up by a water spout or severe wind shear.
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Old 20-11-2018, 14:03   #10
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Re: What Kind of Rig is This?

So, how well does it sail without using the jibs?
It should be able to sail on any point, including directly into the wind?
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Old 20-11-2018, 14:09   #11
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Re: What Kind of Rig is This?

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So, how well does it sail without using the jibs?
It should be able to sail on any point, including directly into the wind?
Nope, needs a windmill for that one.
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Old 20-11-2018, 14:41   #12
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Re: What Kind of Rig is This?

It would be good to see more commentary on this innovation. Catamaran design seems to be in hiatus. Bigger, more junk on board, condominiums for retirees.
It seems that the builders are all chasing the well heeled and charter market but real innovation often occurs at the other end of the market place.
This forum should be the place innovations are explored and reviewed. In detail.
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Old 20-11-2018, 14:49   #13
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Re: What Kind of Rig is This?

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Nope, needs a windmill for that one.


If it works like it looks like to me, understand this is just me looking a the thing and having read nothing.
They way I assume itís done is to position the ďWingsĒ to the relative wind so that the lift vector is longest and in the direction you want to sail.
If so then you ought to be able to position them so that the lift vector is straight forward.
Although to be honest, just looking at them, they seem too small, unless of course they are in a very high speed airflow, then the lift could be substantial.
They also have to be fully symmetrical airfoils, and that also hurts performance.
Also it appears that they have a long trim tab at the trailing edge?
I assume itís movable and maybe there to control camber?
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Old 20-11-2018, 14:50   #14
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Re: What Kind of Rig is This?

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It would be good to see more commentary on this innovation. Catamaran design seems to be in hiatus. Bigger, more junk on board, condominiums for retirees.
It seems that the builders are all chasing the well heeled and charter market but real innovation often occurs at the other end of the market place.
This forum should be the place innovations are explored and reviewed. In detail.


I donít know, just looking at it, it doesnít look like an inexpensive boat to me, way out of my price range Iím sure.
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Old 20-11-2018, 15:14   #15
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Re: What Kind of Rig is This?

To answer some questions:
The A47 is a $1.5 Mill plus boat so not for everyone.

All the reviews raved about the mast foil rig. Chris White invented and patented it.

The masts are carbon fiber so I expect fairly light for what they are. They are semi rotating and I think the forward mast may be pivoting dead on to the camera in the first pic. Maybe that was on purpose to show the foil.

All CW boats are really high performance. Not one of them has ever been close to average, they are way above that.
The A47 also has an adjustable keel fin for even better pointing.


https://www.chriswhitedesigns.com/mastfoil-discussion
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