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Author Topic: GRP Hulls - Internal framing  (Read 1919 times)

sailorboy61

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GRP Hulls - Internal framing
« on: September 15, 2010, 10:03:05 am »
Hi all,

when building with a GRP hull, what is recommended for the internal frameworks (deck supports etc)?

is balsa OK to keep the upper weight down, or something like spruce/obeche better to give the hull a little more strength. There doesn't seem to be more than a matter of pence in cost of similar 5 x 5 / 5 x 6mm lengths of either?

Thanks

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Circlip

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Re: GRP Hulls - Internal framing
« Reply #1 on: September 15, 2010, 10:07:03 am »
Deck level and below, go for strength, upperworks, lighter is better. Depends whose fingies are poking it when it's finished.

  Regards   Ian
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colin-d

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Re: GRP Hulls - Internal framing
« Reply #2 on: September 15, 2010, 10:21:21 am »
personly i use plastic.... and make a grid framework, plus a few bulkheads to be on the safe side..
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sailorboy61

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Re: GRP Hulls - Internal framing
« Reply #3 on: September 15, 2010, 10:30:24 am »
Thanks Ian / Colin,

the plastic looks great, but much more expensive I imagine having seen the prices being charged..... I did wonder about contacting our local uPVC window people to see if they had any offcuts that might be suitable for this job.
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Circlip

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Re: GRP Hulls - Internal framing
« Reply #4 on: September 15, 2010, 11:22:56 am »
Tony trouble is, in same thickness sections, solid plastic is heavier than ply. Foamboard is good. Plastics from your UPVC window mechants - Look for offcuts of plain door panelling, expanded polystyrene sandwiched between two sheets of styrene sheet, scrap the inner core to "Re-claim" the outer sheets. :-)) Extrusions are a bit heavy but can be trimmed to give some usefull "Shapes"

  Regards  Ian.
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brianB6

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Re: GRP Hulls - Internal framing
« Reply #5 on: September 16, 2010, 12:52:56 am »
Hi There
It is much cheaper to buy styrene from a plastics supplier in sheet form than at the model shop.
It usually comes in 1.5 m x .9 in various thicknesses.
What you don't use on this model will come in handy for the next :-))
Regards
B6
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sailorboy61

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Re: GRP Hulls - Internal framing
« Reply #6 on: September 16, 2010, 10:04:00 am »
I did notice Tyne Models selling it by the big sheet at Birchwood..... but still green behind the ears didn't realise what value it was!
Roll on Blackpool with my shopping list!
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allanb131

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Re: GRP Hulls - Internal framing
« Reply #7 on: September 16, 2010, 10:22:46 am »
I have a shop fitter and sign maker  just down the road and his bins are an amazing source of free plastic of all shapes and sizes. Owner said fine just don't leave a mess.
Saves quite a bit as my son builds yachts and uses the very thin sheet.
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Circlip

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Re: GRP Hulls - Internal framing
« Reply #8 on: September 16, 2010, 01:56:42 pm »
I need further clarification on this one, I was under the impression that Free means cost Nowt   {-)

  Regards  Ian.
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