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As far as I understand, the boil test for BS 1088 marine grade plywood is 72 hours, but I must admit that it is difficult to find a clear answer to this. I did managed to find this information on buildworld.co.uk: "The WBP rating is a glue standard developed in the United Kingdom and set down...

An update on my project. After our discussion here about building the boat in PVC foam and the many advise I got, I thought it would be worth spending some more time trying to finding some marine grade plywood. More about that below. Meanwhile the NA Eric Henseval has made the design changes...

Hi The Wing Guy, Thanks for your advise. Unfortunately foam core is not about personal preference, but my only option, as I can't get marine grade plywood here in Thailand (unless I make it myself). So I have to live with the extra construction difficulties, or abandon the project all together...

Thanks Andrew, The 600 GMS was not specified by the NA, but only his quick rule of thumb calculation. Fallguy used 600 GMS on some deck panels if I remember correctly, and even though the span was not that big, they still flexed when walking on them. I don't worry so much about the weight of...

Thanks Fallguy for all the pictures of your project and explanations about how the female jig works. Did you finished the ship, or is it a work in progress?

Thanks, that settles that then :)

You are right, it does sound absolutely crazy, but maybe my head is full of foam. It sound very interesting, and I can see that there are some Thai names in your suggestions for wood. I'm not sure if it is possible to make it cheaper though, the price for the foam will be around USD 1.000,-, but...

It took me some time to understand, let's just blame my English skills. I found a post on the forum from last year that explain the concept, it makes a lot of sense. Regarding the female stations, if building directly on the bulkheads like Niels Helleman do in the picture I posted yesterday, I...

Thank you very much for running the calculations . This is quite interesting, and even though I wouldn't be able to calculate this myself, I understand the reasoning behind. This minimum skin thickness requirement makes the foam core a second player. Maybe H60 @ 10 mm would be the safe way to...

Fallguy, that seems like way to much trouble to put you trough, but thanks :-)

I now got some prices from a few suppliers, and they are spanning very vide. The prices from UTEK are delivered in Bangkok, and include my estimate of import tax and VAT. The other two suppliers are both located in Thailand. It's a shame that Clara Sonic are so expensive, because they are...

Haha, yes that is important. I think the max displacement is around 1000 - 1100 kg, so if build in ply that will only leave around 500 kg for wine and other provisions.

Thanks for the calculations. The theoretical hull area is 15.35 m2, and the deck and cockpit is 9.55 m2. Does the weight matter? As I understand it from the NA, any weight saved on the foam core will have to be added as ballast. Regarding the layup, I think aiming for something that can...

Your guys are incredible... Thanks Today I have been to "woodstreet" on the outskirts of Bangkok, and as expected I didn't had any luck finding marine grade plywood there either, so the foam core is still the only solution at hand. Got a quote from clarisonic.com, a Thai based PVC foam...

Thanks for the replies from both Fallguy and rxcomposite :-) That is a lot more glass than the original plywood design where the outside skin is only a 300 gms biaxial on a 9 mm plywood. So if I understand Rxcomposite correctly, I have to go up to at least 1300 gms of biaxial, right? Some of...

[/SIZE] Yes that was also what I have been thinking, but to be honest I have no experience working with PVC foam, so haven't really come to a conclusion on that. I will probably start laminating the bulkheads and longitudinals first, to start with the smallest pieces, and get a little...

Thanks Fallguy, Thats a lot of useful information, and I will read it many times over to make sure I got all of it. This is exactly why it is so useful to ask in a forum like this, had no idea that I could use plastic nails. I will try to see if I can find the specific products that you...

Hi, I'm thinking about building a Souriceau 4.75., a smal costal cruiser designed by Eric Henseval. Since I'm located in Bangkok, it is impossible for me to locate marine grade plywood. The "marine" plywood that are used for boats here is of unknown quality, a risk I'm not ready to take. The...