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29-09-2008, 17:15
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#31
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Registered User
Join Date: Jun 2008
Posts: 33
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Quote:
Originally Posted by David M
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?
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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
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29-09-2008, 18:22
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#32
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Registered User
Join Date: Feb 2008
Posts: 123
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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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29-09-2008, 19:36
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#33
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Registered User
Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
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Quote:
Originally Posted by Nordic cat
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
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Check the hull shape on my 20 year old hull design
Nothing new there
Dave
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30-09-2008, 16:50
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#34
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Registered User
Join Date: Sep 2006
Location: Out of the Office
Posts: 909
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Hey Merlin, no worries.
daniel
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30-09-2008, 17:44
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#35
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Registered User
Join Date: Aug 2007
Boat: Whitby 42
Posts: 68
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Quote:
Originally Posted by Merlin Hawaii
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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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.
-the troll
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30-09-2008, 18:16
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#36
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Registered User
Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,253
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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!
__________________
Will & Muffin
Lucy the dog
"Yes, well.. perhaps some more wine" (Julia Child)
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30-09-2008, 18:24
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#37
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Registered User
Join Date: Aug 2007
Boat: Whitby 42
Posts: 68
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Quote:
Originally Posted by S/V Antares
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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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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30-09-2008, 20:16
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#38
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Registered User
Join Date: Jun 2008
Posts: 33
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Quote:
Originally Posted by w42
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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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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30-09-2008, 20:27
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#39
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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"I predict 50 knots!"
__________________
David
Life begins where land ends.
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30-09-2008, 20:31
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#40
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Registered User
Join Date: Jun 2008
Posts: 33
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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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30-09-2008, 20:32
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#41
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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Musical helmseats?
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David
Life begins where land ends.
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30-09-2008, 20:41
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#42
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Registered User
Join Date: Aug 2007
Boat: Whitby 42
Posts: 68
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Here is a close up of the twist
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30-09-2008, 20:43
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#43
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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Good gawd...look at the thickness of that mast compared to the people near it.
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David
Life begins where land ends.
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30-09-2008, 20:44
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#44
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Registered User
Join Date: Aug 2007
Boat: Whitby 42
Posts: 68
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Quote:
Originally Posted by Merlin Hawaii
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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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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ABYC Trained
I post, therefore I am (an expert).
Censorship alive and well.
Lighten up people!
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30-09-2008, 20:46
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#45
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Registered User
Join Date: Sep 2006
Posts: 9,398
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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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