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  1. Zonker

    Beefing up the insides for JSD

    I would not use release film. It is smooth. I'd use peel ply which leaves a micro textured surface, ideal for following laminations.
  2. Zonker

    Beefing up the insides for JSD

    In case I wasn't clear: wet out the fabric on a plastic covered horizontal table. Then sprinkle a bit of silica and roll/squeegee it into the fabric. This thickens the resin and prevents vertical drain out (and makes it more sticky. Roll it up into an easy to handle piece. Now apply to the...
  3. Zonker

    Beefing up the insides for JSD

    No need to get fancy on vertical laminations. Wet out your fabric, then sprinkle a light dusting of colloidal silica into the resin to thicken it. Squeegee/roll it a bit more. No more than 3x1200 layers at a time until the resin gets tacky. Then add more layers. 
  4. Zonker

    Beefing up the insides for JSD

    To do those splayed laminated are tricky. I've seen the "folded over a tube/pin style at an angle" before but never like your picture. It's cool but at a very high skill level versus flat laminates.  Uni S or even E glass is fine too. Uni E glass is very strong so by the time you get to the...
  5. Zonker

    Beefing up the insides for JSD

    Re the padeye bolt spacing. Yes that's why I assumed only 2 bolts are working. It doesn't mean you can't use them - just that failure mode will be tear our rather than bearing stress. If you make the glass thick enough it's a moot point. You're only dealing with a 5000 lb design load! Leave the...
  6. Zonker

    Beefing up the insides for JSD

    This is a Harken hi load padeye. The fasteners are 10mm. The pitch distance between the 2 fasteners in line with the load is 33mm. This is not enough. The general rule of thumb for bolted fittings in composite is 4x-5x fastener diameter spacing.  When they get closer together (3.33x) then the...
  7. Zonker

    Beefing up the insides for JSD

    Surely there's an old IOR 50'er out there that needs a replacement runner block.
  8. Zonker

    Beefing up the insides for JSD

    I think he said 3 x 3/8" bolts. (9.5mm) Let's assume he bought 316 and they were full shank through the laminate. Cross sectional area for 3 bolts = 3 x pi (9.5)^2 / 4 = 213 mm2 Tensile is about 579 MPa. Shear strength is about 60% = 347 MPa Failure load = 347 MPa x 213 mm2 = 73911 N  =7534...
  9. Zonker

    Beefing up the insides for JSD

    Surely he carries some duct tape? Quickly dry off the surface between waves, slap on some tape and the water is kept out. What could go wrong?
  10. Zonker

    Beefing up the insides for JSD

    Yeah totally agree.
  11. Zonker

    Beefing up the insides for JSD

    5040 lbs = 22384 N 4 x 12mm bolts  E-glass shear strength = 120 MPa  (semi-unknown CSM/woven roving layup) So area needed = 22384 N / 120 MPa = 186mm2  186mm2 / (2 x 12mm) = (not all 4 bolts because they're all so bloody close together) = 7.8mm thick. But that's a failure load. So...
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