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Old 09 February 2004, 18:09   #11
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OSB.
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Old 10 February 2004, 03:27   #12
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Looks like a serious project tue.

I wish you luck and many fine water hours.
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Old 10 February 2004, 04:34   #13
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You must be getting your marine ply from a different supplier 'cos ours looks a lot different to that!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 10 February 2004, 07:50   #14
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Hi

Good luck with that boat. When you have finised with it, it will be worth every minute of the work you put into it.

The work you have done looks great. It's does take a lot of time dosn't it?

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Old 10 February 2004, 09:22   #15
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Quote:
Originally posted by Cookee
You must be getting your marine ply from a different supplier 'cos ours looks a lot different to that!
Looks more like Stirling Board to me. Generally used for roof construction and general building work.

Not wanting to put a downer on what looks like some realy good work, but are yo sure it is strong enough?
Ply is made up from thin veneers of timber glued at right-angles in each ply to give strength in both planes. SB is basically big chip board, and bonded with phenolic resin in a press. It is very water resistant but will not have as much resistance to flexing.
Having said that, it would make a strong core if laminated over with GRP.
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Old 10 February 2004, 13:25   #16
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Having said that, it would make a strong core if laminated over with GRP.
Thats the general idea. It will be totally covered with several layers of GRP. This will mean the wood is totaly sealed and give me very strong bulkheads. I am also going to have all the original bits I have not had to remove glassed aswell so as to produce a nice looking and solid finish to the whole of the boats structure.
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Old 10 February 2004, 13:48   #17
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Very Impressive

Just concerned about Sterling Board, is this okay,I know it will be laminated over to give it strength, but ply on its side marine ply with wax impregnated veneer laminations, would seem a tougher bulkhead.You are going the whole hog here fair play its a big project, well worth doing, check this link www.fibreglast.com
www.boatdesign.net
lots of articles here good luck with the work
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Old 10 February 2004, 14:09   #18
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For what it's worth we would never use anything other than full on marine ply ......................
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 10 February 2004, 15:53   #19
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I must say i am suprised that the original ply? deteriarated as much as it did. How old is the boat and do Rintec still make them like that? What made you decide on Stirling Board over MPly?
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Old 10 February 2004, 16:14   #20
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Whilst sterling board is not the best core to use (it soaks up water like a sponge after a while - builders may well swear by it but believe me its crap and falls to bits) this shouldnt really mater if you can stop the water from entering in the first place.

Ideally a coat of epoxy first and then a couple layers of 1 1/2 oz csm & polyseter resin. It is really important to glass over the top, this can be a bit of a pig to do so make the top edges nice and rounded with a planer, even then it can be difficult to avoid air bubbles at the side. Failing to glass over the top and water will enter and wick its way down the side of the fibreglass and you will be back to square one.

Many cores can be used such as polyurethane foam (excellent as it doesnt soak up water) balsa cores, cardboards etc. The strength of the core doesnt really matter because the panel will get strength from the bond between the two composites. Obviosly You wouldnt make a load bearing transom from a bit of cardboard and a layer of csm but you would be surprised what builders can do with modern core technology on racing boats. Good luck.
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