from drawing to dxf

Wow! Great job.

I would think 2 or 3mm ply (depending on species etc.) would be the easiest to handle for such small lapstrake planking. You could do it with solid wood but I think you would have more difficulties..again depending on the quality of wood available.

Not often we see such good followthrough on projects like this. Keep going and good luck.

 

Thanks.
I used 4mm for frames, and was looking for 1mm airplane plywood for laps but couldnt find, so i try with 1.5mm ordinary plywood instead. Biggest problem is to get this to look estethically nice, so all planks would be nicely put down. see what I manage during the weekend. (actually plan is to see how it looks in size 1:5 and then decide to go for this in 1:1 at a later stage) reason for using laps is to avoid bending aluminium plates in 2 directions.
(this is pics is a similar project a guy from denmark did but not in lapstrake)

 

You will find an example how to do it in TouchCAD here:

http://www.touchcad.com/tc3training.html

 

Nice job with the model, jonnyb.
With a 3d scale model you no longer need software for this boat.
I would like to comment briefly on the rescue boats. They were designed to go out in conditions which should have all the other boats thinking about going in. When my father was young he had a neighbor who had been a captain of one of them for quite a few years before moving to the U. S. He told my father these boats could lie hove to in any weather and make almost no leeway and from lying hove to could be made to sail on either tack without falling off to make way. Try that in your average sailboat.
I don't know how much of that was seamanship and how much was by virtue of the boat, but that is what the captain said. And what a wonderful capability for a rescue boat with no motor.

 

Thanks,
I agree. This boat is extraordinary. Of course all boat is a compromise and if you look for high speed performance CA-design is not todays sailing speed junkies best choice, but if you think about sailing to antarctica, along roaring fourties etc then i think CA still have some of the best design out there. I will not even fiddle with his design. I stick to what the master suggest. He spent his life fiddeling with this design and CA 108 was one of the last ones out there. (ok the paper is stretced around 1/4 inch in 100 years)

I still have problem figure out to plank it nicely. i try with paper-strips, but I cant get the garboard plank right it seems. Seems at least that 16 planks is correct amount.

 

Jonny, are you in China?
Otherwise you could see a carvel planked model in the museum in Oslo or Larvik
Have you thought about clinked topsides and carvel in the bottom?

 

I think that these boats did a great job rescuing smaller fishing boats. They could tow several 40 feet "fembørings". But I have also read a couple of books from the 1950s where young men bought this kind of boats for circumnavigations. In one book they started with a gale in the north sea and couldn't really go to windward.

 

hi, im in oslo now but will be back in middle kingdom again soon, where i actually plan to build this pretty lady with help of chinese labour. unfortuanly hard to build any thing these days on low budget in western world.
reason for lapstrakes is basically trying to avoid english wheel and plate roller. When using lapstrake i can also stay close to original design (first colin archer used to be lapstrake)

 

You are probably thinking about the book Rundø? The two rundo guys didnt have much sailing experience before they left norway. Its hard to say what makes this boat special. these guys in picture was paid crew and professional. They probably sailed more in one year than we do in a lifetime. Mostly in extremely difficult condition during winterstorms in northern part of Norway.