Re: [Paddlewise] Bad Forward Sweep

I had to check a naval architecture text to make sure I wasn't 
blowing smoke. I understood what Matt and John were saying, but 
figured some of the disagreement between them could have been due to 
misinterpretation of terminology. I have my own description of some 
of these terms at 
http://www.guillemot-kayaks.com/Design/ParticularDescr.html. I just 
added a few more abbreviations to the page because there seem to be 
many in standard use. And then of course there are different 
interpretations of what different abbreviations mean.
Nick

At 1:06 AM -0800 1/11/02, Matt Broze wrote:
>Nick Schade wrote:
><SNIP>
>>>>>>>In a kayak the COF and COB tend to be close but they usually are not
>in the same place. COF is the location of the axis about which trim
>will change if you shift weight fore and aft. It does not move (much)
>when you change the trim where COB and COG do change substantially.
>
>Not trying to pick nits, just want to make sure we are all on the same
>page<<<<<<<<
>
>I was using the terms given by John (and I think how he meant them) and
>assumed that Center of Flotation was a term that was being used
>interchangeably with the Center of Buoyancy (which I think was what John
>meant too). After searching around in several books I couldn't find Center
>of Flotation mentioned at all. However, on searching for it with Google I
>see Nick is correct (or at least he agrees with the sources I found anyhow)
>and the Center of Flotation is the center of the waterplane area.
>I also continued to use the same abbreviations as John did for consistency
>although I believed that CG, CB, CF are the more widely used abbreviations.
>Sorry for any confusion. I guess I should have stayed in college. ;-)
>Without other forces acting on them I believe the CB and CG will come to
>rest on the same vertical axis. The Center of Flotation is of interest as it
>stays near the axis a boat will pivot around when it is pitching (rocking
>end for end) as well as being the axis for changing trim.
>In the future does anyone object to using nautical terms as defined at
>http://www.oneoceankayaks.com/smhydro/hydro.htm#lcb ? I think the excellent
>graphics on this site help make the definitions clearer. I disagree with
>several of the "design" sections conclusions or I'd probably have added and
>promoted this website with a link to it from our website long ago.
>
>Matt Broze
>http://www.marinerkayaks.com

-- 
Nick Schade
Guillemot Kayaks
824 Thompson St
Glastonbury, CT 06033
(860) 659-8847
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