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Rosta Spicl
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I'm convinced, the flat cored plate has not enough torque rigidity. The fixing flange is the critical point where the leverage effect it the highest. I would suggest something like a foam cored pan with lattice bracing system on the bottom...just laminated waffle...
That's the high rigidity system.
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Rosta Spicl
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Group: Forum Members
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Sorry, I tought you would like the original U profiles support system put out and replace by laminated structure all around, but it seems not possible - welded to hull. If the panel is fixed on the top of this structure, flat cored panel is OK. But remember, the lattice bracing is more rigid...but heavier of course...
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Massimiliano
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+xSorry, I tought you would like the original U profiles support system put out and replace by laminated structure all around, but it seems not possible - welded to hull. If the panel is fixed on the top of this structure, flat cored panel is OK. But remember, the lattice bracing is more rigid...but heavier of course... Hi Rosta Spici, what do you mean by lattice bracing? Sorry, I don't understand
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Rosta Spicl
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Group: Forum Members
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See the waffle. That's generally a pan, supported by lattice structure from the bottom side - it means bottom area of pan filled by crossing ribs fixed to the side flanges of pan. Understand? Remember, from the rigidity point of view the height of ribs is the much more important than rib width. 
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Massimiliano
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Group: Forum Members
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+xSee the waffle. That's generally a pan, supported by lattice structure from the bottom side - it means bottom area of pan filled by crossing ribs fixed to the side flanges of pan. Understand? Remember, from the rigidity point of view the height of ribs is the much more important than rib width. Thank you, understand! You got me hungry too :-)
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Massimiliano
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Group: Forum Members
Posts: 167,
Visits: 1.1K
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+x+xSee the waffle. That's generally a pan, supported by lattice structure from the bottom side - it means bottom area of pan filled by crossing ribs fixed to the side flanges of pan. Understand? Remember, from the rigidity point of view the height of ribs is the much more important than rib width. Thank you, understand! You got me hungry too :-) Can anyone recommend number of layers and carbon fiber type(s) to achieve the 2mm thickness?
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DD-Compound
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You can say roughly 1000g/m2 per mm. We mostly use a 1000g quadraxial two layers each side. That is a laminate that suits to a lot of scenarios. If you can’t get that use maybe 4 layers of 600g Biax (yes that would be little thicker and heavier but it’s a boat not a airplane) It is important to make it 0/90/+-45 to get a quasi isotroph laminate. Also take care on symmetry, otherwise your platform can be twisted badly. For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail. At that swim Plattform I would go thicker that 20mm and would not put a waffle at the bottom. Then better go to 50mm thickness for stiffness and you are safe. For twist you can add some UD layers but I don’t think that’s needed.
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Massimiliano
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Group: Forum Members
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+xYou can say roughly 1000g/m2 per mm. We mostly use a 1000g quadraxial two layers each side. That is a laminate that suits to a lot of scenarios.If you can’t get that use maybe 4 layers of 600g Biax (yes that would be little thicker and heavier but it’s a boat not a airplane)It is important to make it 0/90/+-45 to get a quasi isotroph laminate.Also take care on symmetry, otherwise your platform can be twisted badly. For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail.At that swim Plattform I would go thicker that 20mm and would not put a waffle at the bottom. Then better go to 50mm thickness for stiffness and you are safe. For twist you can add some UD layers but I don’t think that’s needed. Thank you DD-Compound! I am not able to source any quadriaxal carbon from my suppliers, can a biaxial +/-45° alternated with a twill do the same job?
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Hanaldo
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+x+xYou can say roughly 1000g/m2 per mm. We mostly use a 1000g quadraxial two layers each side. That is a laminate that suits to a lot of scenarios.If you can’t get that use maybe 4 layers of 600g Biax (yes that would be little thicker and heavier but it’s a boat not a airplane)It is important to make it 0/90/+-45 to get a quasi isotroph laminate.Also take care on symmetry, otherwise your platform can be twisted badly. For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail.At that swim Plattform I would go thicker that 20mm and would not put a waffle at the bottom. Then better go to 50mm thickness for stiffness and you are safe. For twist you can add some UD layers but I don’t think that’s needed. Thank you DD-Compound! I am not able to source any quadriaxal carbon from my suppliers, can a biaxial +/-45° alternated with a twill do the same job? Quadraxials are essentially just 2 layers of biaxials stitched together with one layer flipped over for balance. So yes, it would do the same job - a quad would just save you the effort.
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DD-Compound
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Yes, that will do the same job. A good help is also the R&G or Saertex Material calculator for weights/resin and thickness
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