Re: [Paddlewise] chine and stability

Jed wrote;

Jed wrote:
<< Past 10°'s or so of lean takes us into the realm of secondary stability
>>

Matt wrote:
<< Has this been agreed upon somewhere and I've missed it all these years?
Please let me know your source or sources for this. >>

>Jed responds:
  >  John Winters, in his essay on "Stability and Seaworthiness" offer a
>definition for a metacentric height. As part of that definition he refers
to
>initial stability as stability at small angles of heel. He later refers to
a
>small angle of heel as usually less than ten degrees.
>    I used tranductive reasoning to (incorrectly) arrive at the definition
of
>Initial stability as being limited to angles of heel less than 10°. I
>apologize to all involved for my incorrect interpretation of Mr Winter's
>writings. Certainly there is some range of heel that we can agree to refer
to
>as the realm of initial stability and another range that we can agree to
>refer to as in the realm of secondary stability. Please tell me what these
>ranges are so I will not misspeak in the future.

Jed, you got it right enough if the naval architecture books I studied and
the naval architects I worked with over the years know anything at all.

In the past people have asked for a list of my sources assuming, I suppose,
that I make this stuff up as I go. To head this off at the pass try the
following;

Principles of Naval Architecture" by the Society of Naval Architects and
Marine Engineers ( I have some partiality to this one since I belong to this
august body. Hey, don't ask why they would want me, it still amazes me.)

Introduction to Naval Architecture by Thomas Gilmer (text book used by the
U.S. Naval Academy)

Basic Ship Theory byRawson and Tupper

Seaworthiness: The Forgotten Factor by C. J. Marchaj

Cheers,

John Winters
Web site address http://home.ican.net/~735769






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