Bridgedeck centreboard why don't they work???

Discussion in 'Multihulls' started by valery gaulin, Jan 10, 2017.

  1. Ilan Voyager
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    Ilan Voyager Senior Member

    I use now a cloud service, and an external hard drive used only briefly for the copies. I change systematically the hard drives every 2 years, they are pretty cheap now. For the solid states, I'll wait a bit, until all the youth problems will be fixed and the prices more decent.
     
  2. Ilan Voyager
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    Ilan Voyager Senior Member

    Brian

    "Do you still have an association with a boatyard that builds in wood composite?"
    No, I sold my share of the shipyard in Brittany to my associate, 22 years ago. He retired and closed a few years ago.
     
  3. brian eiland
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    brian eiland Senior Member

    If I remember correctly the P16 carried considerable less sail area, but could perform right up there with the H16
     
  4. brian eiland
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    brian eiland Senior Member

    Funny you should mention an iMac. About 3 months ago I picked up a big screen iMac desktop at a flea market in St Augustine. Got it at a GREAT price. Fellow said nothing wrong with it, he was just getting divorced, ....reason for low price. When I first tried it out seemed to work fine, but within several hours it started shutting down on its own right in the middle of whatever I was trying to do.

    Took a trip up to the Apple store, and was told it had a bad hard drive. Bad news, was it was an older computer that they no longer stocked parts for, nor worked on. Good new, he said was that most normal hard drives could be put into it. Went on line and found a tutorial as to how to get inside that machine, but I just haven't taken the time to do it yet.

    So now I have a laptop and a desktop that need work. The you-tube tutorials make it look relatively easy ?,....I hope
     
  5. brian eiland
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    brian eiland Senior Member

    As I understand it the old style ones are still plenty good as an 'external, very large capacity, good price hard drive. The advantage of the solid state ones is they speed up your prime time using machine due to quicker action and less fragmenting (no fragmentation), and they will absorb rougher handling. So only need SS hard drive in laptop I using on line/every day usage. Plus I think the prices are coming down fairly quickly on them.
     
  6. UpOnStands
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    UpOnStands Senior Member

    If its an older white frame model its relatively easy. If you have a new thin edge aluminum frame then be real careful about not letting anything touch the face of the screen , which will have to come out.
     
  7. pogo
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    pogo ingenious dilletante

    :rolleyes:

    Back to boating please.

    pogo
     
  8. UpOnStands
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    UpOnStands Senior Member

    yes, well, some design rules/guidelines for the Dart keel would be nice.:D
     
  9. pogo
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    pogo ingenious dilletante

    Mmh,
    for me , myself and i, understanding the principle , realizing the advantages of the dart keel is enough. Far enough for bringing this clever solution perhaps alternatively into the SOR of my next boat.

    Figuring out the principle, investigating the performance of a Dart keel is satisfying.

    I don' t wanna know everything , everything down to flow separation , graphs , formulas ...
    I don't wanna design a boat.
    Knowing how and why is enough for me.



    Concerning broaching and front daggerboard of the big Dazcat :
    " Work" in progress, i hope that i will have figured it out asap.

    pogo
     
  10. UpOnStands
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    UpOnStands Senior Member

    looks like we are back

    to our regular program of trying to make centerboards work.
     
  11. pogo
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    pogo ingenious dilletante

    Centerboards work !
    Surface piercing centerboards under the bridgedeck work well enough for cruisers.
    Of course this solution has little drawbacks in performance , earlier separation of minor- flows, is prone to ventilation , and blah,
    but for cruisers it also has advantages.
    Clever designed Bridgedeck centerboards have successfully tried for decades. Clever designed means that the mechanic is a little bit complicated for being bulletproof. Expensive.

    So, no one has to reinvent the wheel, no one has to reinvent the mechanical solutions of a bridgedeck centerboard.
    They are all documented in this thread.
    A well thought out solution with all ( ALL) possible feature has been linked on page 9, i guess post 141.
    You only have to "read" the pix in this link, then copy what u want or need.
    http://www.katamaran-shambala.de/apps/photoalbum?aid=226947






    The canard board of the big Dazcat seems to have additional tasks, especially together with a delta keel and a dart keel.
    I'll try to figure them out.

    pogo
     
  12. cavalier mk2
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    cavalier mk2 Senior Member

    In reference to Dick Newick's 3 Cheers the forward board and separated rig where intended to help with balancing the boat for self steering as they couldn't get a satisfactory vane system working for the OSTAR. For Mike.McMullen's attempt twin vanes, one on each side of the wing were tried.
     
  13. pogo
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    pogo ingenious dilletante

  14. cavalier mk2
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    cavalier mk2 Senior Member

    3 Cheers MK2 saw the centerboards replaced by daggers and the rig changed to a cutter. By MK3 electronic autopilots were reliable enough and the design used a single dagger.

    Dick did use a forward trim centerboard with a main dagger in Phil Weld's 60' Rogue Wave.
     

  15. redreuben
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    redreuben redreuben

    So does the Dart/Delta keel operate something like a Lateen sail ?
     
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