Re: [Paddlewise] FATNESS ratio

> Therefore the
> "Fatness ratio" could be defined as 1000 times the "Volumetric Coefficient"
> (which is a non-dimensional version of the displacement-length ratio).

I am surprised how little I can find on the Web about Volumetric Coefficient
relevant to boats.


>If you take the total displacement (the weight of the boat and its contents)
>and convert it into volume by dividing that weight by the weight of the
>volume of sea water in a cubic unit (that you are measuring length in) and
>then divide that by the waterline length cubed you get the Volumetric
>Coefficient. 

Is this part of the formal definition that SALT water density be used. And
for that matter is there an official density of SALT WATER that everyone
uses? (Baltic Sea a lot less salty than other places for example)

Does Volumetric Coefficient have an OFFICIAL definition?


>I did not invent it. The Society of Naval Architects and Marine Enginers
>proposed a standardized presentation format for model resistance in
>"Explanatory Notes for Resistance and Propulsion Data" which includes the
>fatness ratio (Volume displacement/(0.10L)^3 . They also include the
>displacement/length ratio (They call it the fineness ratio - go figure) for
>North Americans more familiar with the dimensional term.

>Because I live in Canada where we use metric units but design for US
>builders etc. I prefer the non-dimensional terms.

Thanks John. 

I certainly share your preference for non-dimensional terms. But on the
other hand I prefer fine to fat :)

Now is this fatness ratio -- is it linked to SALT water density
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