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Old 29-09-2008, 18:15   #31
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Why would they want to increase the wetted surface area per amount of volume with a hard chine as opposed to a parabolic cross section?
I think that in the previous pic, what appears to be a hard chine is actually a reflective illusion.

The hulls are clear high gloss with the carbon exposed

And I believe that the amas actually do have a soft chine flattened ellipical bottom

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Old 29-09-2008, 19:22   #32
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great looking boat but it looks like the courts have decided it is not going to sail. we shall see.
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Old 29-09-2008, 20:36   #33
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Some of the big French tris use a flared chine to push the waves away from the hull sides to bring down the secondary drag this creates as well. See the picture showing the hull shape on Idec, the current singlehanded round the world record holder with Francois Joyon at the helm.

Alan
Check the hull shape on my 20 year old hull design






Nothing new there

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Old 30-09-2008, 17:50   #34
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Hey Merlin, no worries.

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Old 30-09-2008, 18:44   #35
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I think that in the previous pic, what appears to be a hard chine is actually a reflective illusion.

The hulls are clear high gloss with the carbon exposed

And I believe that the amas actually do have a soft chine flattened ellipical bottom
Yes, no hard chines. As for paint, it is painted black/white forward of the mast and forward aka. The rest is clear coated.

Rumours are they may try for the sailing speed record. After the fate of the next AC is determined by the courts.

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Old 30-09-2008, 19:16   #36
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I once rode on a Dick Newick Tri at 20 + knots and it had a harmonic "Howl" That made my neck hair stiff and my ---- pucker. I wonder how this magnificent craft "Hums"... Wow!
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Old 30-09-2008, 19:24   #37
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I once rode on a Dick Newick Tri at 20 + knots and it had a harmonic "Howl" That made my neck hair stiff and my ---- pucker. I wonder how this magnificent craft "Hums"... Wow!
The amazing thing with the BOR90 is the "twist" the platform experiences when flying two hulls, even in light air. Unbelievable! No doubt it is an engineered twist, but I dont think I could ever get used to sailing it with that sort of twist!
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Old 30-09-2008, 21:16   #38
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The amazing thing with the BOR90 is the "twist" the platform experiences when flying two hulls, even in light air. Unbelievable! No doubt it is an engineered twist, but I dont think I could ever get used to sailing it with that sort of twist!
The rig has no shrouds, only two masthead backstays that mount just forward of the rear crossarms

Under load the backstay pulls the rear windward crossarm up

The designers aren't worried about it, as the leeward ama (in the water) remains level and on the same plane the main hull

They said it's not worth the weight of the additional reinforcement that would be required to keep it level

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Old 30-09-2008, 21:27   #39
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Old 30-09-2008, 21:31   #40
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They have an interesting tacking sequence:

First they bring the canting mast over from the windward side to the leeward side

The assistant helmsman mans the lee helm

As the boat carries through the tack, the main helmsman runs from the previous windward helm to the new windward helm, and takes over from the assistant helmsman

The assistant helmsman then moves over to man the new lee helm
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Old 30-09-2008, 21:32   #41
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Musical helmseats?
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Old 30-09-2008, 21:41   #42
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Here is a close up of the twist

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Old 30-09-2008, 21:43   #43
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Good gawd...look at the thickness of that mast compared to the people near it.
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Old 30-09-2008, 21:44   #44
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They have an interesting tacking sequence:

First they bring the canting mast over from the windward side to the leeward side

The assistant helmsman mans the lee helm

As the boat carries through the tack, the main helmsman runs from the previous windward helm to the new windward helm, and takes over from the assistant helmsman

The assistant helmsman then moves over to man the new lee helm
And to make things more complicated, the each helm has two wheels. One for the rudders, one for the trim tab on the center dagger board. Plus there is a "gas pedal" used to release the mast hydraulics before the tack maneuver.
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Old 30-09-2008, 21:46   #45
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Ever watched how much the wings on a 747 flex? If they were rigid they would break.
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