Rib Style Boats

Discussion in 'Fiberglass and Composite Boat Building' started by nbb, May 16, 2012.

  1. nbb
    Joined: May 2012
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    Location: australia

    nbb Junior Member

    has anyone ever made a stich and glue style boat simmilar to a rib style boat but with solid pontoons intesd of inflatable ones? does anyone know of plans for this type of boat? i have been considering builing the outboard dory 18' from bateau and trying to add flotation pontoons to it too accomadate raising the floor considerably. this boat is narrow and would be unstable otherwise. thanks guys i am new on here so g'day to everyone
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    If you are concerned about stability, just build a seasled and be done with it.

    RIB's, which were developed for lifesaving response, and don't have any stability advantage. All the did was minimize weight and add anti-swamping capability due to the large buoyancy high. In minimizing weight, they went faster and were eaiser to hoist aboard a ship, and in the civilian side, easier to trailer. Making the chambers rigid just adds weight high were it is not needed and nothing else to the stability. (Foamed chambers are a little different, especially in military craft where you expect the chamber to be holed)
     
  3. DCockey
    Joined: Oct 2009
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    Location: Midcoast Maine

    DCockey Senior Member

    You obviously don't understand the mystique of RIBs. Perception over reality. :D

    If the added sponsons are low enough that they are partially submerged then they will add to stability. But why not go with a hull designed with a wider beam?
     
  4. nbb
    Joined: May 2012
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    Location: australia

    nbb Junior Member

    what i want is a vessel purly as a tool for spearfishing. i want somthing that is very economical to run. thus is why i chose the narow style v hull however it has to be a selfdraining deck and i want to have alot of storage incorparated into the boat i have seen craft similar to this but they have all been unstable with a v hull, i want the vhull to take on the choppy conditions and for beach launching though the surf as well as bar crossings that can have some heavy waves. ribs are a very popular craft for us spearos, they are economical can handle taking waves and you kno if left with no one in them when you retern they will not be full of water and sinking. i am just not keen on inflatable sponsoons. i really want a high deck fuel would be underfloor and i will take as much efort as i can to keep a low centre of gravity however i kno with out the sponsoons it will rock like crazy and become easy to capsize.
     
  5. liki
    Joined: Nov 2008
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    Location: Finland

    liki Senior Member

    Take a look at: http://www.paragonyachts.se

    Those boats have a deep V bottom, something like 26 degrees and a hard collar. The collar is more for aesthetics and protection, than helping with stability. At rest it is located quite near to waterline from about midships to stern, so it should affect also stability atleast a little after some initial heel.
     
  6. nbb
    Joined: May 2012
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    Location: australia

    nbb Junior Member

    Nice but i am looking for somthing much smaller and a stich and glue desighn to build myself
     
  7. liki
    Joined: Nov 2008
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    Location: Finland

    liki Senior Member

    Yes, use them for inspiration. I don't think that you will find any ready stock plan for such boat, S&G construction or other.
     
  8. brian eiland
    Joined: Jun 2002
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    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    Do a earch for RIBs on this forum and I'm sure you will come across some interesting subject threads as well as pics. I remember a few solid chamber vessels but don't recall where they are on the forum at this moment. If you don't find them let me know later and I'll lead you there.
     

  9. brian eiland
    Joined: Jun 2002
    Posts: 4,939
    Likes: 175, Points: 73, Legacy Rep: 1903
    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    Do a search for RIBs on this forum and I'm sure you will come across some interesting subject threads as well as pics. I remember a few solid chamber vessels but don't recall where they are on the forum at this moment. If you don't find them let me know later and I'll lead you there.
     
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