Re: [PCW] Catamaran stability

DO
Dennis OConnor
Thu, Feb 23, 2006 12:34 PM

They wrote me that the considered a catamaran,
but
discarded the idea due to "stability questions".


Having a cat go on it's back is a serious matter, though they usually
don't sink...
Having almost any of the floating condo monohulls in production
roll over is a sure sinking as those picture windows cave in and
the upper stories fill with water...
It depends on what scares you...
The Dashews have built the equivalent of a destroyer so that
they feel secure... It is a fine boat... It's not my cup of
tea...
Now, a cat that is 83' long and 20' feet wide is a stability question..
83' long and 40' wide is not a stability question... The research
has been done and the graphs are out there...  Properly designed,
either a monohull or a cat hull will survive amazing waves but the cat
has the edge...
A cat hull does not require active fins underway, and flopper stoppers at anchor...
After doing a lot of reading, this old rag bag sailor decided
that the retirement boat is to be a power cat...

denny


What are the most popular cars? Find out at Yahoo! Autos

They wrote me that the considered a catamaran, but discarded the idea due to "stability questions". ***************************************************** Having a cat go on it's back is a serious matter, though they usually don't sink... Having almost any of the floating condo monohulls in production roll over is a sure sinking as those picture windows cave in and the upper stories fill with water... It depends on what scares you... The Dashews have built the equivalent of a destroyer so that they feel secure... It is a fine boat... It's not my cup of tea... Now, a cat that is 83' long and 20' feet wide is a stability question.. 83' long and 40' wide is not a stability question... The research has been done and the graphs are out there... Properly designed, either a monohull or a cat hull will survive amazing waves but the cat has the edge... A cat hull does not require active fins underway, and flopper stoppers at anchor... After doing a lot of reading, this old rag bag sailor decided that the retirement boat is to be a power cat... denny --------------------------------- What are the most popular cars? Find out at Yahoo! Autos
A
Alexander
Thu, Feb 23, 2006 2:49 PM

Just last night they showed a special on the discovery channel were they put
a power monohull against a power cat.  The vessels were tested in very rough
seas with winds reaching 45mph.  The monohull swayed side to side and bobbed
like a cork.  The cat cruised steadily as if it was going through slightly
choppy waters. They actually had a glass full of water sitting on a table in
the salon, the glass never spilled or even moved.

-----Original Message-----
From: power-catamaran-bounces+alexander=catamarans.com@lists.samurai.com
[mailto:power-catamaran-bounces+alexander=catamarans.com@lists.samurai.com]
On Behalf Of Dennis OConnor
Sent: Thursday, February 23, 2006 7:35 AM
To: power-catamaran@lists.samurai.com
Subject: Re: [PCW] Catamaran stability

They wrote me that the considered a catamaran,
but
discarded the idea due to "stability questions".


Having a cat go on it's back is a serious matter, though they usually
don't sink...
Having almost any of the floating condo monohulls in production
roll over is a sure sinking as those picture windows cave in and
the upper stories fill with water...
It depends on what scares you...
The Dashews have built the equivalent of a destroyer so that
they feel secure... It is a fine boat... It's not my cup of
tea...
Now, a cat that is 83' long and 20' feet wide is a stability question..
83' long and 40' wide is not a stability question... The research
has been done and the graphs are out there...  Properly designed,
either a monohull or a cat hull will survive amazing waves but the cat
has the edge...
A cat hull does not require active fins underway, and flopper stoppers at
anchor...
After doing a lot of reading, this old rag bag sailor decided
that the retirement boat is to be a power cat...

denny


What are the most popular cars? Find out at Yahoo! Autos


Power-Catamaran Mailing List

Just last night they showed a special on the discovery channel were they put a power monohull against a power cat. The vessels were tested in very rough seas with winds reaching 45mph. The monohull swayed side to side and bobbed like a cork. The cat cruised steadily as if it was going through slightly choppy waters. They actually had a glass full of water sitting on a table in the salon, the glass never spilled or even moved. -----Original Message----- From: power-catamaran-bounces+alexander=catamarans.com@lists.samurai.com [mailto:power-catamaran-bounces+alexander=catamarans.com@lists.samurai.com] On Behalf Of Dennis OConnor Sent: Thursday, February 23, 2006 7:35 AM To: power-catamaran@lists.samurai.com Subject: Re: [PCW] Catamaran stability They wrote me that the considered a catamaran, but discarded the idea due to "stability questions". ***************************************************** Having a cat go on it's back is a serious matter, though they usually don't sink... Having almost any of the floating condo monohulls in production roll over is a sure sinking as those picture windows cave in and the upper stories fill with water... It depends on what scares you... The Dashews have built the equivalent of a destroyer so that they feel secure... It is a fine boat... It's not my cup of tea... Now, a cat that is 83' long and 20' feet wide is a stability question.. 83' long and 40' wide is not a stability question... The research has been done and the graphs are out there... Properly designed, either a monohull or a cat hull will survive amazing waves but the cat has the edge... A cat hull does not require active fins underway, and flopper stoppers at anchor... After doing a lot of reading, this old rag bag sailor decided that the retirement boat is to be a power cat... denny --------------------------------- What are the most popular cars? Find out at Yahoo! Autos _______________________________________________ Power-Catamaran Mailing List
M
Mark
Thu, Feb 23, 2006 4:59 PM

It sounds as though the Dashews hold a hard requirement on capsize recovery.  Here they talk about building a cat for coastal cruising.  Sure would like to see that design, but I'd bet it's big and pricey like their other boats.  Probably something like a Gunboat.

from http://www.setsail.com/s_logs/dashew/dashew210.html
"As                    some of you know, Linda and I courted on catamarans and went                    on to design and build a series of high-performance boats in                    the 60s and 70s. These were all day sailors, although to us,                    once we had babies, they were our "family cruisers". We're not                    fans of multihulls for cruising offshore, but a modern fast                    cat, with modest accommodations and lots of boat speed sounded                    like an interesting approach for local sailing."

Dennis OConnor ad4hk2004@yahoo.com wrote: They wrote me that the considered a catamaran,
but
discarded the idea due to "stability questions".


Having a cat go on it's back is a serious matter, though they usually
don't sink...
Having almost any of the floating condo monohulls in production
roll over is a sure sinking as those picture windows cave in and
the upper stories fill with water...
It depends on what scares you...
The Dashews have built the equivalent of a destroyer so that
they feel secure... It is a fine boat... It's not my cup of
tea...
Now, a cat that is 83' long and 20' feet wide is a stability question..
83' long and 40' wide is not a stability question... The research
has been done and the graphs are out there...  Properly designed,
either a monohull or a cat hull will survive amazing waves but the cat
has the edge...
A cat hull does not require active fins underway, and flopper stoppers at anchor...
After doing a lot of reading, this old rag bag sailor decided
that the retirement boat is to be a power cat...

denny


What are the most popular cars? Find out at Yahoo! Autos


Power-Catamaran Mailing List

It sounds as though the Dashews hold a hard requirement on capsize recovery. Here they talk about building a cat for coastal cruising. Sure would like to see that design, but I'd bet it's big and pricey like their other boats. Probably something like a Gunboat. from http://www.setsail.com/s_logs/dashew/dashew210.html "As some of you know, Linda and I courted on catamarans and went on to design and build a series of high-performance boats in the 60s and 70s. These were all day sailors, although to us, once we had babies, they were our "family cruisers". We're not fans of multihulls for cruising offshore, but a modern fast cat, with modest accommodations and lots of boat speed sounded like an interesting approach for local sailing." Dennis OConnor <ad4hk2004@yahoo.com> wrote: They wrote me that the considered a catamaran, but discarded the idea due to "stability questions". ***************************************************** Having a cat go on it's back is a serious matter, though they usually don't sink... Having almost any of the floating condo monohulls in production roll over is a sure sinking as those picture windows cave in and the upper stories fill with water... It depends on what scares you... The Dashews have built the equivalent of a destroyer so that they feel secure... It is a fine boat... It's not my cup of tea... Now, a cat that is 83' long and 20' feet wide is a stability question.. 83' long and 40' wide is not a stability question... The research has been done and the graphs are out there... Properly designed, either a monohull or a cat hull will survive amazing waves but the cat has the edge... A cat hull does not require active fins underway, and flopper stoppers at anchor... After doing a lot of reading, this old rag bag sailor decided that the retirement boat is to be a power cat... denny --------------------------------- What are the most popular cars? Find out at Yahoo! Autos _______________________________________________ Power-Catamaran Mailing List