For very large hulls (say above 120ft / 35m length), built in wet layup, polyester resin.
How do they insure that the layer is done before the previous one is cured ?
I understand that you can have an army of laminators, or have long gel time resin, but is this not beyond limits ?
I am curious.
Thanks.
They do it part by part. Make a few sqm, let it cure, pull peelply down and go on.
But better to do that by infusion.
I agree, infusion is better.
But, doing large hulls like that can be done hand layup in several ways.
Like DDcompounds says, or layer by layer. Start in the front or at the ransom, and work from there. Some minehunters are build like that. Check layer, sand, repeat.
maxe sure you have an unwaxed resin though, but that’s the same for most applications.
Multiple layers can be done as well, again start at the same point, but then add a second one if you move on, another first layer, another second on the patch you just laminated the first layer, third on the 2 layer patch, etc. But it depends on hullshape and complexity and how many laminators you can work with at once.
shrinkage can be an issue, so I would be careful building up a lot of difference in thickness in the same product.
Thanks.
But how do you create thickness in big infused parts (non cored) ?
In wet layup, you would simply use CSM and/or Coremat.
Use laminates that are designed for infusion. I’ve built parts to 1.5 inches thick with solid glass, no core, no flow media.
Generally speaking, how many layers of carbon will you lay before a layer of glass (or Kevlar)?
Are you talking about a rowboat or a mega-yacht? Is the boat going to be a marina queen, rarely ever leaving it’s slip, or, is it a commercial vessel that needs to be out in Force 5 catching fish every day? Maybe it’s a wind blade or an airplane wing? A skateboard deck or an F1 chassis?
It all boils down to design intent. Are you looking for ultimate strength? What stiffness do you want? How about weight? Is cost a factor? What is the duty cycle? Making one, or a hundred, or ten thousand? There are loads of questions in the design cycle. There really is no “generally speaking”.