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Unconditionally stable sailboats
My, my, my but the things one can learn on a usenet group. Just recently I
learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. That is incredibly good news, for once yacht designers find this out, once boat builders commit themselves to building only catamarans, once legislation is passed forbidding the purchase of any boat but a catamaran one sailboat will ever again capsize. That is great news. Let's get on with the salvation of the sailing world. Unite!! |
Unconditionally stable sailboats
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Unconditionally stable sailboats
"JAXAshby" wrote in message ... My, my, my but the things one can learn on a usenet group. Just recently I learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. Oh, this is very true! Unfortunately, the unconditionally stable position is with the mast pointed down. Rod |
Unconditionally stable sailboats
"Rod McInnis" wrote in message
... My, my, my but the things one can learn on a usenet group. Just recently I learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. Oh, this is very true! Unfortunately, the unconditionally stable position is with the mast pointed down. Monohulls are unconditionally stable when sitting on the bottom. |
Unconditionally stable sailboats
Jeff Morris wrote:
Monohulls are unconditionally stable when sitting on the bottom. Except for the ones with positive flotation. DSK |
Unconditionally stable sailboats
Jeff Morris wrote:
"Rod McInnis" wrote ... My, my, my but the things one can learn on a usenet group. Just recently I learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. Unfortunately, the unconditionally stable position is with the mast pointed down. Monohulls are unconditionally stable when sitting on the bottom. Why does it usually seem that this subject is argued on an "either/or" basis. There are advantages to either approach. Is this really surprising to anyone here? -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://kerrydeare.home.comcast.net/ |
Unconditionally stable sailboats
On Mon, 24 May 2004 19:27:30 -0400, "Armond Perretta"
wrote: Jeff Morris wrote: "Rod McInnis" wrote ... My, my, my but the things one can learn on a usenet group. Just recently I learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. Unfortunately, the unconditionally stable position is with the mast pointed down. Monohulls are unconditionally stable when sitting on the bottom. Why does it usually seem that this subject is argued on an "either/or" basis. There are advantages to either approach. Is this really surprising to anyone here? I've been reluctant to enter this thread because of the significant contribution from the lunatic fringe. Still, for what it's worth: if you define "unconditionally stable" as meaning "unconditionally self righting from any start orientation while the structure is intact", there are several well-known examples. Perhaps the one that comes first to mind, is a trans-Atlantic rowboat. This had buoyant sponsons at either gunwale, but more importantly, raised flotation structures at bows and stern, so that it could not maintain a capsized orientation. This illustrates that flotation sufficient to prevent sinking is not enough for this classification. There must be a righting moment, which can originate with a mast head float, and buoyancy compartments and low CG keel mass but arranged so that the vessel will erect on the sea surface from any roll angle. This can be arranged for monohulls and multihulls. Sailors may not always like the features needed though.... Brian Whatcott Altus OK |
Unconditionally stable sailboats
"Armond Perretta" wrote in message
... Unfortunately, the unconditionally stable position is with the mast pointed down. Monohulls are unconditionally stable when sitting on the bottom. Why does it usually seem that this subject is argued on an "either/or" basis. There are advantages to either approach. Is this really surprising to anyone here? It was a joke, Armond. We gave up on rational discussion when Jax entered. -- -jeff www.sv-loki.com If you can't say something nice, say something surrealistic. -Zippy |
Unconditionally stable sailboats
armand hammer, the comment was that two-hullers are so lost to this universe
that they will convince themselves that their precious training wheels are **unconditionally** stable, a statement so stupid as to defy comprehension. do's boys shore do have fraydie cat wives, donch dem? Why does it usually seem that this subject is argued on an "either/or" basis. There are advantages to either approach. Is this really surprising to anyone here? -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://kerrydeare.home.comcast.net/ |
Unconditionally stable sailboats
brian, stay with the class. the class period after next you can go into your
science fiction and horse breeding on weightless space station stuff. please stay with the class for now, though. Jeff Morris wrote: "Rod McInnis" wrote ... My, my, my but the things one can learn on a usenet group. Just recently I learned that cruising catamaran sailboats are unconditionally stable, that is stable under any and all conditions. Unfortunately, the unconditionally stable position is with the mast pointed down. Monohulls are unconditionally stable when sitting on the bottom. Why does it usually seem that this subject is argued on an "either/or" basis. There are advantages to either approach. Is this really surprising to anyone here? I've been reluctant to enter this thread because of the significant contribution from the lunatic fringe. Still, for what it's worth: if you define "unconditionally stable" as meaning "unconditionally self righting from any start orientation while the structure is intact", there are several well-known examples. Perhaps the one that comes first to mind, is a trans-Atlantic rowboat. This had buoyant sponsons at either gunwale, but more importantly, raised flotation structures at bows and stern, so that it could not maintain a capsized orientation. This illustrates that flotation sufficient to prevent sinking is not enough for this classification. There must be a righting moment, which can originate with a mast head float, and buoyancy compartments and low CG keel mass but arranged so that the vessel will erect on the sea surface from any roll angle. This can be arranged for monohulls and multihulls. Sailors may not always like the features needed though.... Brian Whatcott Altus OK |
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