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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.
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>>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
>>
>>
>>
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--
Courtney Thomas
s/v Mutiny
lying Oriental, NC
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