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Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction > Multihull
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  #231  
Old 03-18-2014
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Re: How do you feel about catamarans?

Shuttleworth's article was very informative. Prior posts point out difficulties for both types of vessels in extreme weather such as encountered in cyclonal storms. More commonly one can expect to encounter winds/seas of gale and lower grade non cyclonal storms. In a given year the coastal sailor is likely to see thunderstorms and line squalls with the offshore sailor being caught by a fast moving low in spite of best weather routing. One notes multihulls are entirely dependent on form stability. It would appear to be easiest to make a modern tri unsinkable then a cat with water tight cross beams and compartments fore and aft lastly a mono. Concerns not fully addressed but alluded to in John's article are
1. pitchpoling- here prior comments about JSD or other devices are entirely appropriate
2.presence of "false" keels degrading the remarkable ability of multihulls to slide sideways down a wave front but without proper design at risk for inversion. This risk also increases with over loading or if D/L is too high by initial design.
3. windage. when excessive leading to unfavorable motion and risk of structural failure
4. inadequate height of bridge deck and/or bridge deck brought to far forward and/ or aft increasing risk of inversion.
5. hull cross section shape - risks as presented in citation.
6.downflooding as discussed in prior posts
Looking at the multi hulls through the years I've seen there are some where this issues seem to have been thought about and addressed but like with some trends in recent production mono hulls in the majority of production multi hulls not so much. I think this is not a reflection of the superiority of multi v. mono but rather of one particular design versus another. Still one returns to the issue it seems for offshore you need a well thought out multi of >~45' and that's well beyond the reach of the average mom and pop sailor ( self included). Boats not having appropriate offshore features make excellent coastal cruisers but you pay for the extra space.
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  #232  
Old 03-18-2014
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Re: How do you feel about catamarans?

There are and have been many cats below 45' safely sailing the oceans of the world. The first sample that comes to mind would be the Prouts and their 35 and 37' Snowgoose model. Even John Shuttleworth has had many of his below 45' models cross oceans. Here's a story of a bunch of high school kids that built two Shuttleworth 31's and sailed from Europe to the Caribbean then back to Europe.
FOSsailing:*Aktuell
I talked a few days ago to another couple who sailed their Shuttleworth 31 from Europe to the Caribe a few months ago.
I'm sure the larger the multi is the more seaworthy and sea kindly they are, probably holds true for monos as well? But it doesn't mean a smaller multi can't be seaworthy.
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  #233  
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Re: How do you feel about catamarans?

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I actually quite enjoy being a spouting sailing snob.
"Spouting sailing snob" - Try saying that 3 times real fast! I ended up with "spouting snailing sob".
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  #234  
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Re: How do you feel about catamarans?

Anyone find it ironic that the OP asked how we "feel", but the conversation devolved into factual reports and roll effort stats.

I feel cats are not as weather capable as monos. You keep your reports.
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  #235  
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Re: How do you feel about catamarans?

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I submit that getting wet or even pooped is not the same as causing damage. It would seem that the JSD allows the wave to hit as gently as possible which is about all one can ask for under the circumstances while the crew remains "dry and relatively comfortable."
Again, we'll just have to agree to disagree... You can believe what you want to believe, but I find it hard to imagine that the sort of seas that were sweeping the deck and filling the cockpit of a bluewater thoroughbred like an Amel 53 would not be likely to seriously damage the sort of sliding glass patio doors found on many cruising catamarans today...

The Alpha 42 abandoned back in January was disabled in conditions not even REMOTELY approaching the severity of the survival storm endured by the crew aboard KIMBERLITE, after all...
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  #236  
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Re: How do you feel about catamarans?

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It is what it is. It takes 50% more force to knock a 35' cat down to 90 degrees than it does to knock a 35' monohull down to 135 degrees. Your question has been answered. If you need more info to satisfy yourself I suggest you start beating on the keyboards. Infact show me an article that would prove a 40' mono will be safer and faster than a 35' cat, I just think that's poppy ****. How would you make that comparison?
So, to apply that analysis to a real world example - that of the capsize of the 35' PARADOX due to a 50-knot "gust" I cited in Post #171... Are you saying that a typical 40' cruising monohull would have been driven beyond its Limit of Positive Stability by a gust of wind packing less than - indeed only HALF of - the force of the gust that inverted PARADOX?

Sorry, that's patently absurd...
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Re: How do you feel about catamarans?

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Originally Posted by JonEisberg View Post
So, to apply that analysis to a real world example - that of the capsize of the 35' PARADOX due to a 50-knot "gust" I cited in Post #171... Are you saying that a typical 40' cruising monohull would have been driven beyond its Limit of Positive Stability by a gust of wind packing less than - indeed only HALF of - the force of the gust that inverted PARADOX?

Sorry, that's patently absurd...
Multihull Design Considerations for Seaworthiness
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  #238  
Old 03-19-2014
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Re: How do you feel about catamarans?

despite it not being well known, people are sailing catamarans at high latitudes:

Boat is named 'Ice Cat'

"Sunshine Coast yacht designer Robin Chamberlin (52), and Devonport pharmacist Terry Travers (45), who in 1999 became the only people to sail a catamaran inside the Antarctic Circle, have embarked on a south-bound challenge of a different kind. "

new adventure described here:
Sail-World.com : Antarctic adventurers go South again

More adventures of Chamberlin and Travers:
http://www.sail-world.com/USA/index....=0&tickerCID=0

Last edited by Multihullgirl; 03-19-2014 at 09:25 AM.
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  #239  
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Re: How do you feel about catamarans?

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Quote:
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So, to apply that analysis to a real world example - that of the capsize of the 35' PARADOX due to a 50-knot "gust" I cited in Post #171... Are you saying that a typical 40' cruising monohull would have been driven beyond its Limit of Positive Stability by a gust of wind packing less than - indeed only HALF of - the force of the gust that inverted PARADOX?

Sorry, that's patently absurd...
Multihull Design Considerations for Seaworthiness
Right... So, in the Real World, the graph in Figure 3 constitutes 'PROOF' that a boat like a Valiant 40, sailing in flat water in 11 knots of wind, when suddenly stuck by a gust of wind possessing roughly half the force of a 48 knot gust, will wind up with its mast underwater, and its keel in the air ???

Dream on...
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  #240  
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Re: How do you feel about catamarans?

Sunken catamaran:
Devonhouse Recollections
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