It is supported by a big structure in the hull.
Look at it this way: you want to build a balcony off the side of your
house. You can support it at the outside edge, typically with posts but
you could use cables to suspend it. That's what we have. Alternatively
you could cantilever it off the existing structure. Which is a
different engineering problem altogether, as the loads are different.
For example, an unstayed mast will have much less compressive loading on
it, no stays pulling down on it, but will have a much bigger bending
load. So the butt end tends to be pretty huge, but the top can be
pretty light.
- Graham
dwight veinot wrote:
Over the last few weeks we have had several posts on standing rigging,
including shrouds and shroud tensions, baby stays, check stays, back stays,
fore stays and also on the mast itself and the spreaders on our C&C designed
boats.
All this stuff needs regular inspection and sometimes insurance companies
insist that parts, in particular shrouds or turnbuckles be replaced after an
unspecified number of years just in case.
I notice that those big Nonsuch boats carry a huge mainsail on a mast that
as far as I can see is unsupported by any standing rigging.
My question is how that unsupported rig carries the forces on it without
breaking while our sloop rigged C&C's need such relatively elaborate
standing rigging.
Anyone know??
Dwight Veinot
C&C 35 MKII, Alianna
Head of St. Margaret's Bay, NS
-----Original Message-----
From: cnc-list-boun...@cnc-list.com [mailto:cnc-list-boun...@cnc-list.com]
On Behalf Of O'Keeffe Thomas
Sent: August 11, 2012 11:38 AM
To: cnc-list@cnc-list.com
Subject: Stus-List C&C 30 MK1 Shrouds and Speaders
I have a similar issue this year on my C&C 29-2: under sail, the spreader
tip on the leeward side moves fore and aft several inches. My rigger took a
look.
The spreader goes over the spreader base at the mast, and is pinned to the
base with a clevis pin. The hole in the spreader has elongated, which
allows the spreader to work back and forth slightly on the base, which
translates to a wider range of motion at the tip of the spreader. The
motion occurs only when that side is leeward. When loaded on the windward
side, there is no motion. In my case, the rigger (a very reputable guy)
advised it is not dangerous. But it is annoying.
This is a long term wear issue that I just noticed this year. I think it
has been doing it for a while, but this is the first time I sailed with jib
only, so I was able to see it. With the main up it is not obvious.
Would appreciate any ideas to repair the spreader to eliminate the
elongation in the hole.
Tom
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