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Hey John,
Your labels are correct, and you’re right; some of the stress from the
anchor chain carries through the snubber line beyond the stem eye,
towards end “A” – but not as much as you think. I don’t pretend to
understand the physics of it, but there isn’t a lot of strain on the
snubber between the stem eye and the shackle on the end of the anchor
roller, and almost none beyond it to the cleat. Most of force is
expended on the stem eye. (Note, too, that I don’t have an extended
anchor roller platform, so a bit of strain on the anchor roller shackle
is not a concern).As for chafe on the snubber line, I don’t care. You can see the old,
thin line I’ve been using – just a scrap I had lying around when I
decided to try out this approach. It has now held the boat for around 12
months at anchor. It’s showing signs of chafe here and there, but so
what. If it eventually breaks before I replace it and the windlass has
to take hold of the anchor chain for a few minutes while I replace the
snubber, it’s not a big deal. If it worried another skipper on his own
boat, he could start out with a better piece of line and maybe even lay
on some chafe protection. Then it’d probably last for years, if not
longer.Tor
Silverheels, P-424 #17
http://www.silverheels.us <http://www.silverheels.us/>
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Tor,
Makes sense using expendable line for the snubber. It’s just that if the
line is feed through either the stem padeye or bow shackle shown in your
2nd pic, it seems to me that line could chafe through in a matter or hours
not a season. I think I would at least run the line through a very large
galvanized block on the stem padeye to ease a little of the chafe. But you
say this is not necessary, at least in the short term.Regards,
John Stevenson
http://www.svsarah.comOn Thu, Apr 5, 2012 at 6:43 PM, Silverheels wrote:
Quote:Hey John,Your labels are correct, and you’re right; some of the stress from the
anchor chain carries through the snubber line beyond the stem eye,
towards end “A” – but not as much as you think. I don’t pretend to
understand the physics of it, but there isn’t a lot of strain on the
snubber between the stem eye and the shackle on the end of the anchor
roller, and almost none beyond it to the cleat. Most of force is
expended on the stem eye. (Note, too, that I don’t have an extended
anchor roller platform, so a bit of strain on the anchor roller shackle
is not a concern).As for chafe on the snubber line, I don’t care. You can see the old,
thin line I’ve been using – just a scrap I had lying around when I
decided to try out this approach. It has now held the boat for around 12
months at anchor. It’s showing signs of chafe here and there, but so
what. If it eventually breaks before I replace it and the windlass has
to take hold of the anchor chain for a few minutes while I replace the
snubber, it’s not a big deal. If it worried another skipper on his own
boat, he could start out with a better piece of line and maybe even lay
on some chafe protection. Then it’d probably last for years, if not
longer.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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John,
You’re right, putting a block on the stem eye would certainly ease any
tendency to chafe there. But as I said chafe hasn’t been a problem or a
concern. On the other hand, a block on the stem eye would allow the
strain to pass more easily through to the bow roller frame. It seems
desirable to keep that strain focused on the stem eye, where you want
it. In fact, double-wrapping the snubber line through the stem eye might
be even better to keep the strain more fully centralized there. The
skinny, 2nd-hand snubber line I’ve been using has withstood the little
chafe that occurs for 2 winters of cruising now, and has held the boat
through some serious blows.While the “end A” section of that snubber permits easy adjustment of the
snubber length, it’s primary purpose is to enable me to cast it loose if
I have to cut & run. Until then I want the anchor pulling on the stem
eye.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Rich,
I can’t say for sure that lowering the snubber will effect sailing at
anchor. If I were still out cruising, I’d compare a snubber at deck
level with what I normally use (at the stem eye), but I’m on a mooring
now in a harbor effected by currents, preparing to haul the boat for the
summer.The ketch rig might indeed make some difference at anchor. Even with the
mizzen sail furled, there is a certain amount of windage aft that a
sloop doesn’t have. I suppose, too, that boat trim could make one 424
behave differently from another. My boat is heavily loaded for long-term
live-aboard cruising – I’ve raised the waterline twice! – and she’s
slightly bow-heavy, to boot.Whether or not the stem eye eliminates sailing at anchor, it seems to me
a better way to snub an anchor rode simply because it requires less
scope for a given water depth, or else provides better holding for a
given length of rode. Then again, that probably isn’t a big deal in most
harbors. In the end it’s just a little perk I added because I could.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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