Re: [Paddlewise] Bad Forward Sweep

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


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