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Old 11-26-2010, 07:54 PM   #1
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Default C-flex one-off hull

I am looking into building a one-off hull using C-Flex method and frame layup by Dave Sintes. Anyone have feedback on the process, and experience with making their own hull like that?

Thanks
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Old 11-26-2010, 08:33 PM   #2
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theres a guy on the CB Boatworks site building a 30 something foot off a cold molded frame......nice looking boat...but will be heavier as it takes a lot of resin.
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Old 11-27-2010, 02:57 AM   #3
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Default Dont Do it. everyone that has wishes they had not.

You will be grinding glass for ever. or filling so much filler that you will grind or have to glass again. There are much better products around for a one off boat. ATC foam is the best of the best. I came across what I think would be a great product to use. 1/4 inch Coosa board in a 4x8 sheet. Where ever you have more bend then the 1/4 inch cant bend you can cut the coosa in strips like the C flex.If you have a large flat area you can use 1/2 or 3/4 for stifness. It wont absorb water, holds screws and wets out real nice with resin. Its is a bit irretating with the fiberglass inside of the foam when you cut it or even handle it. but its very strong. Everyone I know that had built in C Flex wishes they had not.
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Old 11-27-2010, 04:50 AM   #4
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I have built boats using C-flex, when it was the only game in town it was just that, It is horrible stuff to work with as stated above. One of the biggest issuse is the first laminate, being it is soft it almost impossible to get an air free first layer down .The wieght of the newer fiberglass fabric alone will make the hull sag between the station molds.

The last few One off we have done we used a bead and cove foam called Core Cel,its sold by the Gurit company www.gurit.com
its fast fair and you won't be sweeping up your hard earned dollars and putting it in the trash!

here is a small 17' we are doing now,

Contact Marc at CB boatworks he will set you up . also check out his builders forum, you will have to login but its free and you can then see all the fine looking boats people are doing

All the best!, feel free to PM me I will be glad to help you!
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Old 11-27-2010, 04:50 AM   #5
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The boat in my sig. is c-flexed. They went over double planked cypress. Looks awesome. Good luck
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Old 11-27-2010, 05:18 AM   #6
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My uncle and I built a 41 ft motorsailer 20 years ago out of c flex and, if done properly, the problems people mention here don't happen. You just have to have enough framework. That said, Marolina's new technique is probably the way to go. It looks great.
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Old 11-27-2010, 09:51 AM   #7
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Thanks guys. Little more info, my scope of work will be fairing/painting the already glassed c-flex hull, and installing stringers/gunnels/pilothouse. The main hull is "finished", it just needs fairing/compound and gelcoat.

I guess most of the nasty work is already done, this is first time I heard of such method and was wondering what ya'll thought.

The original framework comes with the hull, would it be possible to keep the frames and lay up another hull from male skeleton at some point, if this one works out?

Thanks again
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Old 11-27-2010, 10:13 AM   #8
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A friend built a 24 or 25 Dave Sintes design using c-flex. It was a first time build and the boat came out very nice. I don't believe he had some of the wetting problems mentioned but I think he used the recomended "casting" resin. Fairing was not such a big deal I think, and as I understand it, it didn't sound much, if any, more difficult than fairing on my build where I used CoreCell 3/4" with 1808. I have some pictures he sent me during the build but I only have the attached one on this computer. I think Newton boatworks in Slidel LA uses c-flex and does Sintes designs regularly. Before you give this idea up, you might want to talk to some people who have successfully built using this product. Note the apparent wet through of his hull at this stage. Looks good to me.
ps, I would paint, not gelcoat. I have some good reasons for that but you can open another thread if need be for that discussion.
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Old 11-27-2010, 04:37 PM   #9
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C Flex was one of the first "core systems"--and as such seems a bit heavier than more modern systems. The cove foam sounds like a very good system, and will be much lighter. Most likely you can use it over the same forum (after cleaning it up a bit) that the C flex, and have a lighter and equally as good a boat.

The C Flex boats should last for ever! They were well built.
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