513Re: Most Efficient Hull??
- Jan 17, 2005For your purposes I would recommend Rosdave, Seal, or Danceing
Rosdave will move very economically at V/L=1 with just a 8HP Yanmar;
how ever she will be challenging to plank. If you look at the
diagonals you will see that the diagonal closest to the keel has some
pretty extreme bends at the ends. Those are the bends you will have
to follow with a plank; not easy. Seal and Dancing Feather have less
problems with this. Seal and Dancing Feather demonstrate another
problem in that with a safe and seaworthy hull form pure displacement
hulls quickly generate more displacement than needed to carry a
pleasure boat interior and ballast is needed to get them to their
design waterlines. Canoes without ballast of 40 feet are not safe or
comfortable for their inhabitants on the ocean so you won't find such
designs. This continues until you reach ship sizes where ocean waves
are much smaller than the hull. This explains the popularity
of "lifting hulls". Rosdave will in fact generate a small amount of
lift, many of the v-bottoms on the site will also generate lift and
the designers notes are the best guide to which generate most unless
someone has actually built them and tested. What you are looking for
might be described as "the best solution of a motorized canoe with
ballast". Well at least that imparts the idea I'm trying to get
--- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
> I suppose that this is an excellent example of why text only
> has so many limitations.
> I ass-u-me'ed that my specifying a V/L of 1.0 would point everyone
> a displacement hull. But that was obviously incorrect.
> We have folks replying with dinghy's and planning boats as
> While I can't deny that these boats can be or are very efficient, I
> was actually thinking of power displacement hulls in the 25' to
> 40-ish' range.
> Generally speaking - while realizing that exceptions do exist - I
> believe that a long narrow displacement hull form will be able to
> carry a larger load - read cruising supplies - longer distances with
> more comfort using less fuel than other types of boats.
> So now that I've explained my thought process a bit, I again ask -
> with some added verbage - which power displacement hull design on
> atkin web site do you believe would be most efficient?
> Thanks - and with apologies for the earlier confusion.
> --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
> > Which hull shape at http://www.atkinboatplans.com/ do you believe
> > be most efficient?
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