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Tim C

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Posts posted by Tim C

  1. seems like most boats would sell on trademe if listed at a $1 reserve. Not sure what the buyers would do with them but every one loves a bargain even if they don,t really want it.

     

    No no no. This is the point. So many of our boats will cost far more in refit, once you've done the paint job, replaced the old mast and rigging to make them safe, new sails, new squabs, re-wired and re gas lined etc etc, than you could ever hope to get as re-sale. In a 9-10m boat that is easily $100 000. Even if you do that, they are still old designs.

     

    You are probably not driving a around in a Ford Sierra anymore, even though they were good cars at the time.

     

    It is time to re-envigorate our fleet of launches and yachts with new and interesting craft that are efficient and perform well. Genuine classics need to be saved of course.

     

    Our designers, boat builders, but most importantly our boat owners need to use some imagination again!

     

    Our past Kiwi boats were a great part of boating evolution. Let's keep evolving...

  2. I think the mounting number of relic boats on moorings around the country is something we are just not prepared (yet) to face as a sailing culture that loves their boats.

    How many boats would be the result of deceased estates, where the relatives have no idea what to do with the boat??

    Think how much mooring space would be freed up if these abandoned boats were removed?

    Surprisingly there appear to be abandoned boats on marinas now too, despite the ongoing cost.

    The reality is someone has to pay to cut these boats up and dispose of them. Many have no value. Even the lead value would be eaten up in the disposal cost.

    Then there is the operational boats that are trying to be sold, where their refit cost vastly exceeds their resale value. Again, they have no value left, and most likely need to be disposed of.

    All of this would give opportunity for local and home builders to update our local fleet, with no excuse of 'no where to put a yacht'. Ideally not just with AWB, but some innovation again.

    But I have no idea where the encouragement to dispose of old boats is going to come from...

  3. Oh my god, no ! Tim Clissold was 100% right.

    Oh my god, no ! Tim Clissold was 100% right.

    Oh my god, no ! Tim Clissold was 100% right.

     

     

    (I tried three times to quote this, but it was obviously 'quote protected', so I had to cut and paste! So it deserved to get pasted three times.)

     

    Well there is a sentence I never ever ever thought I would hear TimW ever say in public! Stop the world, miracles do happen!!

     

    Would you like some suggestions on the sheer web design of your next ones. Always happy to help!

     

    PS you've broken a boom too I remember.

     

    PPS I'm not the sort to say I told you so regarding wood in the centreboard environment...

  4. Tim

     

    I am sure hd foam would have a better sheer than cedar but the problem with that foam is getting stuff to stick to it. It is far easier to bond to a piece of wood.

     

    How much wood in your boat? :D

     

    Everything but the hulls is wood core.

     

    Did I just shoot myself in the foot?...

    :?

     

    Actually all the sheer web are plywood on the 45˚ with DB over them. Mast, 3 beams, floors under the deck, etc.

     

    And Kauri in the foils as sheer webs, not cedar. But I have learnt a bit in the last 15 years since I built the foils first (in the project timeline)

  5. Western red cedar has density of 380 kg/m3. I can't find the sheer properties at hand but I would guess high density PVC foam is superior to cedar by far.

    The economical option is to link the two sides with double bias by splitting the centre core (if it has to be timber) and glassing the edges of the core to form two U sections, then glue them back together to form an I beam. Obviously you need to allow for the extra glass thickness.

    Larger centreboards (15m cats + ) are often solid glass at the hull exit as no core can stand the sheer or compression, especially when owners don't pull the boards up when tearing onto a reach. In fact most centreboards are engineered for a maximum speed, when fully down, and the owner should know that speed...

  6. I'd suggest that if you have to have wood in a foil then you need to use the strongest orientation of the grain to prevent a hull exit compression failure. It would be more efficient to use it like end grain balsa, ie with the grain running the shortest distance between the carbon flanges.

     

    The contribution of the cedar to longitudinal strength and stiffness compared to the carbon content is minimal.

     

    Using the cedar along the foil is relying on its core sheer strength. Remember how you split fire wood, along the grain. Imagine a plank lay up of a cedar core boat without the glass either side; it would be easy to break.

     

    More efficient again would have been a double bias sheer web.

     

    Wood has as much place in a carbon foil as aluminium in the marine environment...

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