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  1. Zonker

    Boom Bale Hole Repair

    80. THEN 120 or 160. Did you leave it cure for a few days before sanding?...
  2. Zonker

    Boom Bale Hole Repair

    Often local sailmakers will have some Spectra webbing and can sew them up
  3. Zonker

    Boom Bale Hole Repair

    Which paint primer are you using? https://www.totalboat.com/product/2-part-epoxy-primer/ Thinning: TotalBoat Epoxy Primer Thinner 200  https://www.totalboat.com/product/aluminum-boat-barrier-coat-primer/ Thinner/Reducer: TotalBoat Epoxy Primer Thinner 20...
  4. Zonker

    Boom Bale Hole Repair

    Yeah it doesn't go through the fwd block. I think you're right.
  5. Zonker

    Boom Bale Hole Repair

    Maybe if 1 strop fails the block hangs from the other strop.
  6. Zonker

    Boom Bale Hole Repair

    Hmm, I think I'm missing what you're asking. The strop just replaces a bail. The strop takes the mainsheet load into the boom. It's pretty much a vertical force with a bit sideways when the boom is way outboard. Not much horizontal force going into the mast. 
  7. Zonker

    Boom Bale Hole Repair

    It's bearing strength you have to worry about, not a linear tensile tear. That's the failure mechanism of the original setup which wasn't adequate.
  8. Zonker

    Boom Bale Hole Repair

    Almost certainly 6061-T6 or some closely related 6000 series for 95% of mast/boom extrusions. You can't (easily) extrude 5000 series especially big sections like mast and booms. More common in small sections like flat bars and angles. That's why you see 5000 in rolled plates and some stiffeners...
  9. Zonker

    Boom Bale Hole Repair

    Folks - when you weld 6000 series aluminum (typical boom/mast extrusions) the yield strength drops significantly. Yield drops from something like 34 ksi to 20 ksi in the welded area. So you think you're making the boom stronger but you're locally weakening it. This is why most good mast fittings...
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