T&T: All chain rode scope question.

[Lee Licata]

I have been watching this thread.

On a 400000 lb. displacement boat, I routinely anchored using 7:1  
scope (all chain, 5/16", 88 lb delta) at night and 5:1 during the  
day. Bottom conditions were varied but never had a "loose" bottom as  
far as I can remember.

The Navy taught me that 7:1 was what I should aim for.

So, In all of my years driving nuc submarines, I think I anchored 3  
times when the Scope < 5:1. (Just 2 times at 7:1. Those post visits  
were quite quiet and routine...) Why? Nuc subs (except in Hong Kong  
and some other (very few) ports) anchor so far out that the depth  
only allowed 5:1. So, i had emergency underways in Morocco, Antalya,  
Diego Garcia, and other places where 5:1 was just not enough.

Once, and only once, the destroyer that were were tied up to, which  
was anchored, got underway when her anchor broke free.

She 'forgot" we were there..

Now that was an interesting 4 hours....

(She was providing us "shore power" so our reactor was "off." (But  
not for long!!!)

So, I believe that if I stick to 7:1 with an all chain rode, I will  
sleep better at night...

And, so will the admiral. (That is most important!!!)

of course, YMMV!!


Lee
On Aug 31, 2006, at 00:27, Randy Pickelmann wrote:

1.    I have always heard that for all-chain rode, 3:1 is the norm... 
5:1 for
storm conditions.  For the ultimate storm, whatever you've got.
2.    I think there is a good argument for too much rode.  The boat  
will sail
around more with a lot of rode which may put side loads on the gear  
that you
might not see otherwise.  The side pull could actually loosen and  
dislodge the
anchor
3.    Sunday night we anchored in Trippe Creek, off the Tred-Avon  
River.  The
bottom was REAL soft and we couldn't get our Delta (with all chain)  
to take a
good hard set.  Using the "three strikes, you're out" policy, we set  
the #44
Bruce on about 100' of nylon.  This is the first time we anchored  
with nylon
in about two years and I forgot how much more the boat sailed around  
on the
anchor.
4.    Of course, this has absolutely nothing to do with the original  
question.
When did that ever stop us?
Regards,
Randy Pickelmann
MORNING STAR
back in Solomon's, MD
getting ready for Eduardo
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