Sorry Gato, I have absolutely no idea, but based on previous projects I don't think it has been any more time intensive than anything else Ive done.
Cheers
RG

Luiz, all the pics are actually slightly different :-)
As for the boards, I have only ever done one previous cat with skegs and no boards to help guess at the difference....lets just say that I won't willing chose to do another skegged boat
Cheers
RG

Just wondering if there is any point in building a hard chained hull in foam? It took me five weekends to put the round bilged Tabby together.

Indeed. I did not look close enough, maybe just wanting to see more...

Gato, other than a slightly lighter weight (7.7kg/hull before fairing) I don't see much of an advantage since we have a minimum weight. Maintenance & weight gain over time probably favors the foam cored build.
Cheers
RG

My question was more about the foam construction. If you are building in foam it seems to me that it's both faster and easier to build a round bilged hull.

Lookin' good!

One question though, are they carbon or glass beam sockets?

yes, it is easier to build, the attached pic shows how we did the LR2 and the first of the round bilge F12's are done this way also. The whole boat can be laid up with just 3 widths of foam thats coved on the 4 edges and then just glued to get the 3D shape. I have yet to see an easier method than this
Cheers
RG

Yes, socket tubes are E-Glass and epoxy, but have carbon tabs/reinforcing to hold them in place and spread the loads

Cheers
RG

So, in one way we went into the F12 concept the wrong way. We decided to go for a chained hull (wood) because it would be cheaper and easier to build. At least for my part I have learned something. Even if we keep the original idea of the kids participating in the building the foam/glass construction is easier. At least the foam stripping, that’s like making a jig saw puzzle.

At least its a fun jigsaw puzzle.....and it will keep on producing fun :-)

Oh good, it looked like there was carbon against the aluminium beams, which wouldn't be good.

We like the look of the hardchine hull and chose this form over the round version, the foam should be more durable, also people can use our frames to build in ply if needed. The time it's taken us has nothing to do with the build method; lots of other distractions, the flat panel construction is a simple, low-risk option.
cheers Bill

Did it come true

For a more rounded, softer hull design wouldn’t it make more sense… Instead of cutting the foam in narrow strips and routing all the edges with the subsequent loss of a considerable amount of material, why not just score through 70% of the thickness longitudinally.

Similar to what you did on some of the panels of the hard chine design but with much more precision… (in the raw foam, not foam that has already has been glassed) using a fence and narrow blade in a circular saw where you can regulate the exact depth and width of the cut rather than just free handing it with a 4" grinder. One could also make similar cuts on the horizontal plane at the bow where a compound curve is encountered.

It would seem to save a lot of time and material…that H 80 Divinicell isn’t cheap @ $100.00 US a sheet, and over the course of the boat you would end up with 2/3 rds-to a full 4’X 8’ sheet of foam on the floor in the form of dust.

I don't relly understand what you meen here. If you speek about the strip foam there was not a lotof loss in material. The Tabby was built from two sheets 1.2m by 2.4m 15mm thick.
I ripped the strips with a bandsaw with a very thin blade. As the strips are only 5mm thick there was no routing of the edges.
The total cost of foam (Airex) was about 150 USD.

Hi Gato
I was referring to the build method they used for the LR2.
Talking 4' X 8' plain Divinicell sheets and ripping it into strips and doing the cove routing method. H-80 Divinicell 3/8" thick, not Airex, and each sheet are $100 US at this point in time...and that is 1/2 of the list retail price.
In regards to the quanities I quoted...I was using the amount of material needed to build my F-14 design..so if the waste figure seems a bit excessive that's why...

I would have taken this to the home building forum but there is not a lot of action there...not that the F-12 is a fire ball either.

It seems to be the same on the F14 forum. Still I'm thinking of building one

There is plenty of interest, but few acually goes to the step of building a boat.

I am up to my ears in sawdust. Last night I pulled about a 1000 staples from an F16 hull panel. I would like to do a F12 but completing the three F16s have first priority.

What I'm finding (which is not a surprise) is that everyone wants an off the shelf product and ideally an established fleet. I've got all the bits here for a DS12 but as I'm working in excess of 70 hours a week at present and don't actually have a kid, it will be staying a pile of bits for a little longer yet.