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#22
posted to rec.boats.cruising
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Maine Passage - Day 5
Wwhen you tighten the shrouds on a keel stepped mast, the chain plates are pulling up thus caving in the sides of the boat. The cabin deck is pinched up and the partner rides up the mast. Now imaging lots of sail up in a rough sea, those shrouds are apumpin and that cabin top is moving up and down causing all kinds of problems down the line. The fix is a tie rod running from the step to the partner with a strenghtened cabin roof. Top can't ride up, sides can't cave. Gordon |
#23
posted to rec.boats.cruising
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Maine Passage - Day 5
"Richard Casady" wrote It isn't spelled tension. It's spelled "Rigging wire tension". -- Roger Long |
#24
posted to rec.boats.cruising
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Maine Passage - Day 5
On Mon, 04 Aug 2008 10:15:10 -0700, Gordon wrote:
The fix is a tie rod running from the step to the partner with a strenghtened cabin roof. Top can't ride up, sides can't cave. Yes, and the whole boat will be stiffer as a result, like a big box beam. |
#25
posted to rec.boats.cruising
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Maine Passage - Day 5
In article , Wayne.B wrote:
On Mon, 04 Aug 2008 10:15:10 -0700, Gordon wrote: The fix is a tie rod running from the step to the partner with a strenghtened cabin roof. Top can't ride up, sides can't cave. Yes, and the whole boat will be stiffer as a result, like a big box beam. Once the novice had been round and tightened his shrouds (which were loose on one tack, IIRC), I'm guessing this set-up would then retain that tension... but the whole lot would be under a lot more stress. Just curious. Justin. -- Justin C, by the sea. |
#26
posted to rec.boats.cruising
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Maine Passage - Day 5
On Mon, 4 Aug 2008 13:22:48 -0400, "Roger Long"
wrote: "Richard Casady" wrote It isn't spelled tension. It's spelled "Rigging wire tension". Especially when you are discussing the mast? Casady |
#27
posted to rec.boats.cruising
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Maine Passage - Day 5
Yes, the proper tensioning of the rigging wire is a bit more complex and
critical in a keel stepped mast than a deck stepped one. Everything can be quite loose in a deck stepped mast and the mast will be perfectly well supported since it will just rotate about its step. Insufficient tension in a keel stepped mast can introduce a bend just above the deck/cabin top partners. This bend can contribute to column instability. In practice, there won't be significant difference in wire tension between the two rig types but the deck stepped is more tolerant of under tensioning of the wires as long as the tension relationship between the uppers and lowers is right. -- Roger Long |
#28
posted to rec.boats.cruising
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Maine Passage - Day 5
Bruce in Bangkok wrote:
I have a deck stepped mast but from what I read all keel stepped masts will deform when the shrouds are tensioned. The usual fix if a "tie rod" which is bolted to the deck and the mast step to prevent the deck from flexing upward. Apparently this is a normal trait of keel stepped boats I disagree that the boat should flex enough that he can't get the sole hatches open w/o a struggle. Any reasonable boat design needs to consider the rig being in proper tension. I understand the tie rod you mention and would think that an issue on a boat like an O'Day but on a seagoing vessel? So here you are in the Morgan showroom taking delivery of your new Morgan XXX. The salesman tells you if you actually sail the thing, you can either buy a tie rod because the boat is improperly designed or you can forget opening any hatches below because the boat is improperly designed. Seems perfectly incredible to me - either scenario. |
#29
posted to rec.boats.cruising
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Maine Passage - Day 5
On Mon, 04 Aug 2008 14:29:09 GMT, (Richard
Casady) wrote: On Sun, 3 Aug 2008 17:08:00 -0400, "Roger Long" wrote: Tension on keel stepped masts is a bit more complex and critical. Especially since you mispelled compression. Casady Not I Sir! :-) Must be a software glitch. Bruce-in-Bangkok (correct Address is bpaige125atgmaildotcom) |
#30
posted to rec.boats.cruising
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Maine Passage - Day 5
On Mon, 04 Aug 2008 17:26:36 -0600, Paul Cassel
wrote: Bruce in Bangkok wrote: I have a deck stepped mast but from what I read all keel stepped masts will deform when the shrouds are tensioned. The usual fix if a "tie rod" which is bolted to the deck and the mast step to prevent the deck from flexing upward. Apparently this is a normal trait of keel stepped boats I disagree that the boat should flex enough that he can't get the sole hatches open w/o a struggle. Any reasonable boat design needs to consider the rig being in proper tension. I understand the tie rod you mention and would think that an issue on a boat like an O'Day but on a seagoing vessel? So here you are in the Morgan showroom taking delivery of your new Morgan XXX. The salesman tells you if you actually sail the thing, you can either buy a tie rod because the boat is improperly designed or you can forget opening any hatches below because the boat is improperly designed. Seems perfectly incredible to me - either scenario. First of all, you appear to be combining several posts into one. Specifically mine about tie rods and someone else about hatches. You can imagine anything you wish, however, the Pardy's wrote about the installation of a tie rod in their second boat and while I hate to quote them as an authority about anything they have probably sailed more miles then most. I have also seen tie rods installed in keel stepped boat of all sizes, shapes and material so I assume that there is a reason, just as there is a reason for some boats having tie rods connecting the chain plates, to the keel (again in a keel stepped boat). Bruce-in-Bangkok (correct Address is bpaige125atgmaildotcom) |
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