Re: [Paddlewise] chine and stability

From: John Winters <735769_at_ican.net>
Date: Fri, 10 Nov 2000 21:17:02 -0500
Will the real Wayne Smith stand up?

One Wayne Smith wrote:



> Oh my, there are two of us with the same name here!  Less confusing than
at work,
> where there are 5 Wayne Smiths, I guess.
>
> But to answer your question, they're talking about hull shapes --- a more
"boxy"
> shape being classified as "Hard Chined" and a more rounded shape being
classified
> as "Soft Chined".
>

Bring out the nit pickers and strike a blow for pedantry.

Not really. Hard chine boats have a distinct intersection between sides and
hull bottom that meets with a "sharp" edge. A "soft" chine boat has a
rounded intersection and a round bilge boat has no clearly defined
transition from bottom to side the most extreme example being a perfectly
round section.

Gilmer defines it this way: "A more or less sharp corner or knuckle in the
hull form, continuous over a significant length of the ship, as in the
junction of side and bottom of a planing craft. The chine is known as soft
when the corner is rounded, and hard otherwise"

Who is Gilmer? The past head of the school of Naval Architecture at the U.S.
Naval Academy.

Some time back we had a discussion about sheer lines. Where is the sheer on
a boat with a rounded edge? This problem has plagued yacht racing rule
writers and well as those who measure and license ships. The method they use
is to define the sheer as a line formed by a forty-five degree tangent to
the hull/deck surface. Wish I had thought of it as it rather elegantly lends
clarity to something boat designers have puzzled over.






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Received on Fri Nov 10 2000 - 18:26:36 PST

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