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Old 22-09-2008, 14:50   #1
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Monster tri headed for San Diego

I'm up in northwestern Washington this week, visiting family. Tomorrow I'm going to Anacortes to see a 100' tri being loaded aboard a barge, destination: San Diego. It's a water spider from the news photo I saw. I'll try to get some pics while I'm here, otherwise, I'll get them when it starts doing some trial runs in my home port.

http://valenciasailing.blogspot.com/...ut-of-her.html

Woops! It slipped away already, headed south.
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Old 22-09-2008, 15:01   #2
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Looks fast standing still.
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Old 22-09-2008, 18:44   #3
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Does anyone know how a stem leaning aft is faster?
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Old 23-09-2008, 04:07   #4
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Does anyone know how a stem leaning aft is faster?
A reverse bow increases waterline length.
See also:
cruisersforum.com/forums/f109/reverse-bow-13381.html
Reverse Bow
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Old 23-09-2008, 10:17   #5
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They are calculating 44 knots will be reached. EXCITING STUFF!!!!!!!!!!
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Old 23-09-2008, 10:24   #6
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I understand that, but a plumb bow does the same. Just wondering if there is something else? Seems a disadvantage would be the tendency of a bow like that to throw sea grass up on to the deck.
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Old 23-09-2008, 10:25   #7
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i2fro should visit them in San Diego and prepare his famous HURRICANE cocktail, he'll get hired
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Old 23-09-2008, 10:42   #8
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Supposedly, the reverse bows work, but I guess you need to be an expert in hydrodynamics to undertand why. Since I am not, I have no idea All I know is that looks like a toy I would like to play with
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Old 23-09-2008, 11:19   #9
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Doesn't the reverse bow go back to the late 1800's
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Old 23-09-2008, 11:34   #10
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Larry Ellison and Oracle are known as fierce competitors. They've lost against the Swiss in court. Maybe they are now borrowing a design cue from the ancient Greeks - hit them at the waterline!

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Old 23-09-2008, 12:44   #11
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Carl,

That would be a low blow
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Old 27-09-2008, 11:53   #12
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US 87 is a PHENOMENAL machine

100' LOA, 90' BOA, with a 158' carbon fiber wing mast

It carries 13,000 sq. ft of sail, and sails at 2 1/2 times wind speed (20 kts. in 9 kts of wind)

Designed and built as a primarily light wind inshore racer (AC challenger)

It is expected to be a contender for the overall speed record (49 kts)

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Old 27-09-2008, 14:30   #13
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I wonder if the reversed bow ram is designed to promote the boat going through a wave, rather than hobbyhorseing over it.
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Old 27-09-2008, 14:52   #14
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I wonder if the reversed bow ram is designed to promote the boat going through a wave, rather than hobbyhorseing over it.

That is what they are for. The idea is that they will not bury, but rather cut through a wave, and by being narrow and sharp at deck level, they can pull up and out of the wave without creating a braking effect that can lead to a pitchpole.

The traditional way for non-racing boats is to ensure a large increase in bouyancy above the waterline, but if you ever bury the whole bow into a wave, it will offer a lot more resistance, slow the boat down, and maybe slew the boat round, or end in a pitch-pole.


I think the modern trend started with the A-cats initially. Another advantage is the lower windage this gives. Good for racers, not for cruisers who should be sailing more conservatively.

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The same reason that trampoline netting should be more open....
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Old 27-09-2008, 14:53   #15
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Maybe they are now borrowing a design cue from the ancient Greeks - hit them at the waterline
I knew I've seen that feature on old ships before, well long after the Greek ships.



IIRC having see this vessel on an episode of the "Sea Hunters" the CGS Canada built in 1904 had the reverse bow with a fairly large snout (precursor to the bulbous bow) under the water which may have been employed the same as the Greek ships for ramming. What it did for handling rough water I don't know.
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