wrote:
Hi

I will point to a Yahoo group where you can find free/download design
of various sizes and different types of construction. What is
interesting about the site is that it proposes a new building method
developed just to overcome some of the real troubles with ships
building and developed to offer a hull at a third the cost, in modern
seaworthy design , three times the strength of traditional
construction
methods and actually using the computer for the lofting and cutting
of
the only material needed for these designs.. sheet material.
The plans are free and cover traditional small dinghies up to ocean
going combined sail/speed boats. Please notice that as the plans are
CAD drawings, you can alter the designs by up or down scaling the
entire drawing and from a 12 meter heavy speed boat ,end up with a
very
attractive and practical hull for a reliable and safe working boat.
A traditional boat of same size simply needs ribs or frames even in
the
building process, so you can fit the unfolded panels onto something
that
show the shape of the craft and act as substructure ---- with these
crafts. The frameworks go one step further, as they are arranged in a
3D
pattern that make each frame to be supported by all others, providing
a
much stronger hull ,leading to a building technique that makes the
hull
as a thick shell of frames forming a honeycomb structure that is
covered
with the paneling end up as a most rigid construction where sheet
materials are the main building material, where nothing in the
framework needs bending but is cut from sheet materials steel or
plywood.

These are most exciting designs in terms of ease of building while
the
plans in full-scale show each detail, the hull consisting of a thick
shell with the perfect framework underneath offer a ready hull where
most time comsuming details are removed by design. The
full-scale plans can actually be spray-glued onto the sheet material
chosen for panels or framework and cut from the lines on the drawings
directly for perfect fit and a guarantee of the hull given in the
plans,
the stability is better than what Lloyd ask. An option to foam
fill the honeycomb cubes promises an unsinkble hull. You
can cut a hole in the back and place a big in- or out- board thru an
engine
well__after the hull is built and even before you have chosen the
engines.

Check the slideshow that shows just a fraction of both old and the
new
3D-Honeycomb based designs, anyway Cyber-Boat offer free download of
true 3D modern designs _and_ the unfolded panels plus building jig
and
framework assembly, and any material you need, is sheet material of
your choice ; that be steel, pre-made glassfiber sheets with one side
nice turning outside making the finish as the first thing and the
framework as somthing you can cover with mat and resin and just leave
there using it first as building jig and later as permanent honeycomb
framework.

Now please check the site, there are several other groups with
designs, you will find the links at the main group's homepage ---
Btw.
check a search about 3D-Honeycomb as the method also build a house at
a
third the cost four times as strong and only half the trouble
building;

http://groups.yahoo.com/group/Cyber-Boat/

Best regards
Per Corell
Boatbuilder CAD expert

http://home20.inet.tele.dk/h-3d/

Thanks a lot for the elaborate reply. I have now before going through
groups a few questions,(no prior knowledge of naval architecture).

It appears that you have planar intersections of a hull surface in 3D
supplied as template drawings. When made, laminates can be fitted
together in a rigid curved framework serving dual purpose.. as a mould
and also as the core of sandwich boat after inner skins + resin are
laid and cured. Right? You supply the drawings, not the product and it
suits fine.

1) If you scale up the hull size of the CAD drawings, then you are
producing a geometrically similar boat hull, but how about the
stiffener sizes, thickness of skin laminates? Would scaled up
dimensions of stiffeners (bulkhead and hull fiberglass cloth or chopped
strand mat thickness dimensions) be indicated in mechanical design
charts?

2) Are displacement/stability parameters easily calculable by a formula
or design chart for each scale ratio?

3) How are boats made this way be certified for sea-worthiness?
Regards.