[Rhodes22-list] Anchor Chain Question

[Roger Pihlaja]

Rik,

I downloaded the article you referenced, very interesting!.  The author's
use of the theory is sound.  However, for some reason, the author uses an
odd combination of engineering units: knots, pounds mass but not pounds
force, meters, feet, both mass and force in kg?  I was expecting to see
force in newtons when the rest of the calculation was done in the MKS metric
system.  I haven't had a chance to check his math.  But, it's been my
experience that calculations made with inconsistent engineering units tend
to have mistakes in them.  Normally, what's done, is to do a calculation all
the way thru to the end in one system of engineering units.  If the results
are to be presented in more than one system of units, the conversions are
made at the end on the final results.  So, be warned; even though he's got
the theory correct, his numerical results may be wrong because of this units
conversion issue.

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Rik Sandberg" <sanderico at earthlink.net>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Monday, March 14, 2005 4:02 PM
Subject: Re: [Rhodes22-list] Anchor Chain Question


> William,
>
> Here's an excellent paper on the physics of anchoring. Might be more
> than you really wanted to know, but I'd say this guy knows his stuff.
> Sounds like the best combination is a half, give or take, chain, half
> nylon anchor rode. here's the link.
>
> http://www.dulhunty.com/dmp1.htm
>
> Hope this helps.
> Rik
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