Manual furling boom

Discussion in 'Boat Design' started by coupedesign, Jan 27, 2010.

  1. coupedesign
    Joined: Jan 2010
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    Location: italy

    coupedesign New Member

    I designed some boats with hydraulic system, that are not easy to use. Anyone know something about the manual system?
     
  2. TeddyDiver
    Joined: Dec 2007
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    There are some manual gear in >~100 year old gaffers.. simple robust and reliable.. maybe worth of some R&D. Tried to google but didn't find pictures. In Tom Cunliffe's book Hand Reef and Steer there's one picture and a chapter atleast..
     
  3. coupedesign
    Joined: Jan 2010
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    coupedesign New Member

    Do you know "johnmast" mechanism.
    My fear is" what happen when system fail?"
    I'm going to install in a sailboat for a 65 owner so if he will have problem with the furling mechanism, feeder makes harder the falling of the sail.
    Don't you think could be safer a mast trak with roller car?
     
  4. TeddyDiver
    Joined: Dec 2007
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Not my specialty, sorry.. I'm quite skeptic what comes to furling gear "into" anything. Maybe someone with real experience will show up.
    Regards Teddy
     
  5. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    I have used worm drive furlers in several boats. They work great and the maintenance is minimal. The sail has to be cut properly or it won't furl right.
     
  6. coupedesign
    Joined: Jan 2010
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    coupedesign New Member

    Well, marten make an eliptical mendrel where you may roll up a 3DL north.
    However in manual use you never have probem? Do you think will be safe enough for an old user?
     
  7. gonzo
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    gonzo Senior Member

    Yes I think it is safe. The good thing about a boom furler, is that you can always roll or unroll the main manually if the drive breaks or jams.
     
  8. Steve W
    Joined: Jul 2004
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    Location: Duluth, Minnesota

    Steve W Senior Member

    What size boat/sail are we talking about.I am building a system for my 26ft boat which will be similar to what is used on the Corsair trimarans which have a shaft through the mast with a crank on the front,no gears and just a regular bolt rope luff.I have a thread going on sailing anarchy multihulls forum asking questions of actual corsair owners which you may find useful.I am going to use a bolt rope but i will enter the bolt rope a long way up through a prefeeder. I have installed a profurl in boom system for a customer before but it is very complicated and expensive and achieved the same goal.
    Steve.
     

  9. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    The through mast with a u-joint is the Herreshoff system from about 1930. It is simple
     
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