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Everything posted by salt.ed

  1. Hello, replacing trampoline on 38 foot Cat. New netting is polyester and lacing with 1/8" amsteel, hole spacing is ~ 6" apart. I am doing separate lines on each side. The sides and rear of net attaches to flange in deck, forward end attaches to stainless sail track cars. I am also going to do independent attachments at each corner for redundancy. I brummel spliced eye loops in line and then "luggage tagged" them to the net to start with continuous lacing along each side. I know recommendations are for every 3-4 attachment points to be independent but honestly even with the line not secured there is enough friction in it to hold my weight on the tramp even freshly installed. It still needs quite a bit of tightening, every go around gets about another 12-18" on the line but after 1/2 a day my hands were shot, definitely need to finish with gloves and a tool to grab the line. Question is: what is the cleanest way to finish the end of the dyneema lacing ? The holes in the deck flange are small, can't get more than two strands of 1/8" through them. All suggestions welcome. Thanks
  2. Thanks very much for all the suggestions! Yeah tool with a handle was first priority, for the hands. Definitely expecting to have to re-tighten in the future so looking for something secure but not a total bear to redo.
  3. Did you end up looking at the boat? I have a CSK polycon, currently undergoing refit. PM me for more info. Also check out Rudy Choy's book Catamarans Offshore and and Buddy Ebsen's book Polynesian Concept for some historical perspective.
  4. salt.ed

    bowsprit retrofit

    Look at They make nice but very pricey A frame carbon sprits. They sell mounting hardware and have good pictures for ideas rigging the sprit.
  5. salt.ed

    Help with CSK cat rudder design

    Thank you for the suggestions. Very happy to pay for design on this, given my lack of expertise and how critical the rudders are. Any suggestions on who? I have not had much luck in with the people I have approached so far.... Ok trying to post pictures again... Not sure whats wrong, I see them when logged in on the thread but not there when I'm not logged in...
  6. Hello, I have been scouring the forums for info on rudders and have come up with a lot of great stuff. My questions are mostly about the best/most efficient way for me to make new rudders using what I have. I am refitting a 1975 CSK Polycon cat and need to make new rudders. Old ones were trashed and are gone but I have paper tracing of the original shape. They are transom hung with tillers and crossbar. I would like them to kick and want to use existing stainless steel mounting hardware with modification as necessary. I would hold them down with sacrificial dowels. No sure what to do the build out of. I have old growth 1/2" planks of nice doug fir that came with boat for this purpose so would be nice to use what I already have but also thinking about foam core/composite build although. Original rudder pic, the original design dimensions, what I am thinking for new design and a pic of the hardware. CCI (Phils foils) quoted more than 5K and no kick up design, so not so thrilled with that option. Questions are: - Is this a feasible design or are the loads too much and should I just stick with non kick up rudders? How much should I extend the SS cheek plates aft to provide more support if kick up? How should this be done? Welding, composites? - What NACA section should I select. Is 12% the standard or should I go lower for more performance/lighter multihull? - What core material/layup schedule? Thoughts, criticisms and any suggestions are most appreciated.
  7. salt.ed

    I'm making a rudder

    Wow awesome work, thank you for posting! I am refitting a 37' CSK polycon light displacement cruising catamaran for coastal cruising hopefully more extended cruising down the line. Never built a foil before but have fair amount of expoxy/glassing experience. Rudders are transom hung with SS mounding hardware in good condition. Original rudders are gone but have paper tracing of originals so know the dimensional outline. -I am planning on keeping either same outline or the same overall area with slightly higher aspect ratio and elliptical end. Planning on using NACA 0012 foil, should I think about something else? Originals were somewhat balanced, not sure of exact percentage but will aim for ~17% on new ones. -Having been toying with the idea kick up design for safety and beaching but seems like too much force on the pivot point, any ideas? - Finally was planning on using a router jig, glass and west systems to attach the two sides and then wrap with glass. Want to use foam for the core but was thinking about maybe using Coosa board but can't find any other examples of this online. Pros would be very strong, 35-40% lighter than wood, no water absorption/rot in case of damage and easy to work with (? not sure about this but sounds similar to wood from what I gather). Any advice is much appreciated See below pics of original rudders on the boat the mounting casing that goes on rudder and some rough drawings.