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From: Petri, Mike (no email)
Date: Mon Oct 13 2003 - 11:55:33 EDT
Good article regarding this subject. (Watch for a wrapped link. Copy and
paste full address)
http://www.sailnet.com/collections/articles/index.cfm?articleid=woodto051
<http://www.sailnet.com/collections/articles/index.cfm?articleid=woodto051>
-----Original Message-----
From: [mailto:]
Sent: Monday, October 13, 2003 9:27 AM
To:
Subject: Re: [world-cruising] How Much Anchor Chain?
*IF* he were a PhD in Physics instead of some soft science he would skip
most of the chain. However, 250' nylon on 250' chain _is_ better than all
chain with a short snubber. (It's a physics thing.)
In a message dated 10/12/2003 12:46:44 PM Eastern Daylight Time,
writes:
> According to Wm. Van Dorn, Ph.D an oceanographer with Scripps
> Institution of Oceanography in La Jolla, Calif., the 250' of nylon is
> to take shock load off the 250' of chain..... his recommendation, after
> studies documented in his book, Oceanography and Seamanship.
>
> Courtney
>
>
>
> wrote:
>
> >In a message dated 10/11/2003 8:38:43 AM Eastern Daylight Time,
writes:
> >
> >
> >
> >> wrote:
> >>
> >>
> >>
> >>>Current fad is 300+ feet of chain (that's 300# or more of weight
waaaaaaay up
> >>>front, and maaaaaaaaaaaaaaybe a 3 foot nylon snubber (about as
effective as a
> >>>paper condom). Nylon stretches while chain most certainly does not.
In a
> >>>blow that chain will come up short and tear the anchor or the deck
fittings
> >>>loose (including welded samson posts on steel deck boats).
> >>>
> >>>
> >>Not a fad and not current. It's been an accepted practice for decades.
> >>
> >>
> >
> >Nah. Only for beginners "doing the Islands" in a boat that scares the
hell out of them. EVERY last voyager out there for the last umpty ump
decades has -- sooner or later -- figured out what junior physicists
thoroughly know. Namely, that all chain WILL break your anchor -- or deck
fittings -- loose in a blow. (the shock loads can two orders of magnitude
greater on all/nearly all/mostly all chain than compared to a rode of mostly
nylon. [to those that don't know the meaning of the phrase "two orders of
magnitude" is means "almost certainly more than 10x and equally almost
certainly less than 1000x, and most likely at least 50x and probably less
than 500x, and more or less likely around 100x.])
> >
> >No problem if you never anchor in a blow.
> >
> >
> >
> >
> >>FWIW, I've never seen a cruiser use a nylon snubber as short as three
feet.
> >>I'd agree that's inadequate.
> >>
> >>The conditions that most anchor in are not so severe that the
destruction
> >>you describe occurs. Much more often, the rode is lying against
material on
> >>the bottom that will quickly eat through nylon. More often, the
anchorage
> >>is deep enough that a 3:1 or 5:1 rode length is all that can be used;
longer
> >>puts the boat against the shore. Both these conditions favor chain.
> >>
> >>Weight is always a problem for cruisers. Ever see the contents of a
boat
> >>that's been out cruising for a while after that boat has been emptied?
It
> >>could fill a small house. The anchor chain is just one piece of straw
on
> >>that camel's back.
> >>
> >>You may prefer to use nylon as your rode. Every cruiser I've met does
> >>something a bit different. But your choice would put you in a very
small
> >>minority of cruisers.
> >>
> >>--
> >>Best,
> >>
> >>Bryan (KB3HMZ)
> >>"Capella" Valiant 40 #158
> >>Annapolis, MD
> >>
> >>
> >>
> >>To unsubscribe from this group, send an email to:
> >>
> >>
> >>
> >>
> >>Your use of Yahoo! Groups is subject to
> >> http://docs.yahoo.com/info/terms/ <http://docs.yahoo.com/info/terms/>
> >>
> >>
> >
> >
> >To unsubscribe from this group, send an email to:
> >
> >
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
<http://docs.yahoo.com/info/terms/>
> >
> >
> >
> >
> >
>
> --
> Courtney Thomas
> s/v Mutiny
> lying Oriental, NC
>
>
>
>
> To unsubscribe from this group, send an email to:
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>
>
>
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