Like Denny said, the prismatic coefficient is a major factor that takes more than D/L and wetted area into consideration. Here's a link to a quick explanation ofthe concept:
http://www.navweaps.com/index_tech/tech-004.htm
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Jeremy" <jeremy_harris_uk@...> wrote:
>
> Whilst increasing waterline length gives a theoretical increase in "maximum displacement speed" (which is a slightly flawed concept for other reasons), drag, and hence power consumption, is very much determined by D/L, the displacement/length ratio, rather than just waterline length alone.
>
> This is because drag, at least at speeds below the onset of significant wave-making, is massively dominated by wetted area. The greater the wetted are the slower the boat will be on a given amount of power, as long as the length is such as to ensure that the hull is not operating in the region where wave-making drag starts to make itself felt.
>
> --- In electricboats@yahoogroups.com, "\"hanermo\" - CNC 6-axis Designs" <gcode.fi@> wrote:
> >
> > The only important characteristic is waterline length.
> >
> > Longer = faster.
> >
> > > Hey Dan,
> > > Do you have pictures of the mods you made to optimize the displacement
> > > hull? I am still learning all this stuff, so a website or any pointers
> > > you could provide to us would be extremely useful.
> > >
> > > Much obliged,
> > > Bill
> > >
> >
>
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