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Thread: foam

  1. #1
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    Default foam

    hi Guys,



    yet another query...



    there was a box made of foam to hold the fuel tank, but the foam was damaged.



    The foam looks like some kind of insulation material, about 1" thick, fairly hard/compacted (not flaky) and some sort of orange tint.



    It probably had fine glass fibre and resin laid over it for strength and then it was glued/painted.



    I think two of the rudders were made of the same material

    with the middle rudder being wood.



    Any idea what type of foam it would be and where I could get some please?



    Regards

    Peter


  2. #2
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    Default Re: foam

    Hi



    It's probably foam core material, such as Tricast:



    http://www.tridentfoams.co.uk/tricast.html



    For a non-structural parts, ie rudders etc, the low densities can be used (2 or 2.5 lb/cu ft), which can be bought from CFS:

    http://www.cfsnet.co.uk/acatalog/CFS...__Polyurethane _Foam_Sheet_59.html



    For structural parts, Tricast 4 would be used. CFS can also supply this to order, but in 4' x 8' sheets, and its not cheap.



    Construction is easy; cut the foam to size with a knife, and lay-up a single payer of 200gm/m^2 cloth either side with polyester resin. When cured, roughly glue the panels into the assembly shape using hot melt glue, fill any gaps with micro-balloons mixed with resin, then apply a 2" bandage of 300gm/m^2 CSM with a 3" bandage of cloth over that - all in the same operation.



    The construction is varied depending on the use - a layer or two of csm may be applied to either side with cloth on top for structural components, or to resist walking on, etc.



    Using this construction, a 1/2" thick panel will be 6 times stronger and 12 times stiffer, weight for weight, than standard GRP.



    More info is here:



    http://www.boatdesign.net/articles/foam-core/index.htm



    Cheers

    Ian

  3. #3
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    Default Re: foam

    hi ian



    just to add to your advice, this stuff can be used with polyester resin also!

  4. #4
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    Default Re: foam

    Oops... I meant polyester...

    Ian

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    Default Re: foam

    Hi,



    Thanks...there's a lot of info there.



    I'll be reading it over the next couple of days.



    Regards

    Peter

  6. #6
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    Default Re: foam

    Another link for choosing foam for composite sandwich construction.

    http://www.netcomposites.com/education.asp?sequence=48


  7. #7
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    Default Re: foam

    Hi,



    thanks for the link.



    I've been reading up on various foams, resins, etc, and like everything else it gets very complicated very quickly...



    It'd be nice to find a local supplier who can give advice over the counter but it looks like all the local fibre-glass outfits are 'construction' only with no trade counters.



    Hopefully the weather will be half-decent this weekend and I can get the bottom half repaired, glass the seams, paint and fit some skids.



    I should be able to get that finished by Saturday evening then we can flip it over and I can start replacing the deck on Sunday.



    Then it can be painted on Monday and it's a long way towards being finished.



    Just the skirt to sort out after that...



    Regards

    Peter

  8. #8
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    Default Re: foam

    i use a mail order company called CFS. they have been very helpfull and willing to advise over the phone. there website is also full of technical info. best of all there prices are some of the lowest on the net.

    there at www.cfsnet.co.uk

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