how thick the fiberglass?

Discussion in 'Fiberglass and Composite Boat Building' started by CarMan, Aug 15, 2009.

  1. CarMan
    Joined: Nov 2008
    Posts: 62
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    Location: sweden

    CarMan Junior Member

    I am doing a hul extention on may Bayliner 3288.

    How many layers of 450g fiberglass shud i hawe in the botom?
    Shud i do only in fiberglass, or samting in betwen layers of fiberglass
     
  2. apex1

    apex1 Guest

    Could you be a bit more specific? How long the extension, how do you support it (lengthened girders, stringers?), do you move the transom? and so on.....
     
  3. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    of course, it's not so easy to en what inside my head.

    I will only extend swimplatform, so I do not move the rudders or something (the boat has straight axles)

    Swimplatform is extended 4 feet.
    My boet is stern hawy, and neds 4 trimlabel full down, so i am doing an hul extention below the swimplatform, is extention is 3 feet.
    i am adding 2 trimlabels to it. its the only thing how is going to be monted on it.

    The boat has propeler tounels and rouder is monted on the stern, so i need to do tounels on the new extention to. the rouders is outside the tounels when fully tilted, so i can not do rounded tounels on the extention.

    her i som pictures.

    one of the pictures is from an boat how has somting like tis don (foundit on internet)
     

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  4. apex1

    apex1 Guest

  5. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    I am not mowing my rouders. ther is lots of 3288 how get tis extention don, and it do good! las ster heavy and you do not need so mutch trimlabel.

    i am not like schort owerhan on hte swimplatform, so i am doing the swomplatform atleast 1 feet longdet then the hul extention. I am allso doing owerhan at the sides (you can se how in the privius picture)


    my questien is, how do i do the hull, is it OK to do 6 layers of 450g fiberglas?
    ore shud it be 4 layers and divysel, then 3 layers abow ?

    how is the orginal hul construktion?
     
  6. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    Ather boats whid this type of construktion.
     

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  7. apex1

    apex1 Guest

     
  8. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    i will do 2 "doors" for storage 70x70 centemeaters eatch
     
  9. apex1

    apex1 Guest

    Perfect!
    and this:>>>>It is fabric, no mat ja? In the 4th picture that looks like mat<<<<??
     
  10. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    I am not sure what you say.

    i think you want me to use this:
    [​IMG]


    not this.
    [​IMG]

    last year i build a rof extenton, an i only use the thinf you cald Mat, i feedl werry strong.

    can i go for 2 layers of mat 2 layers of fabric and last 2 laers of mat agen ?

    and use som extra layers of fabric in all courners.
     
  11. apex1

    apex1 Guest

     
  12. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    the boat is sitll in water and will be for 2 month, then i can start.
     
  13. apex1

    apex1 Guest

    We are patient here, enjoy your summer! Is too short anyway.
     
  14. Commuter Boats
    Joined: Oct 2006
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    Location: Southeast Alaska

    Commuter Boats Commuter Boats

    Gentlemen, I hope you don't mind me joining in your conversation as I have a thought or two.
    The obvious, making the extension the full 4 feet (or 3 feet 9 inches) of your platform would yield 33% more buoyancy with very little additional weight.
    It would also be easier to board at the swim platform from a skiff if the skiff wasn't able to get under the platform as it would be if you recessed the extension by a foot.
    I'm guessing from your photos that your three-foot extension would yield near 2000 pounds of buoyancy ( approximately volume 11x3x1 33 ft.³) and your structure will weigh between 3 and 4 hundred pounds... 1600 pounds additional buoyancy.
    It seems that you've probably done your research and know that 3 feet works.
    I agree that the unsupported square doesn't justify a core with an exception to the transom, I would core that or reduce its square by recessing the trim tab actuators.
    I've done a bunch of variations but never one quite like this ( I've included a couple photos of one that I did that didn't add planing surface).
    I'm a little surprised that the rudder doesn't misbehave in the examples shown.
    Gerald
     

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  15. CarMan
    Joined: Nov 2008
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    Location: sweden

    CarMan Junior Member

    I hawe not don anny calkulations. bur manny boat has this don, and som of them allso has ounderhulls (ounder hull, the boat has strate courners, not runded. It ad flotation to)

    the boat is stern hawey, and the wxtention will help the boat to not be stern haewy.

    the one i hawe talkt to say it is only goot thing to ad a awtention, but i am a litle worid aboa how it effekt turning the boat sidways (bow truster to starboard, rouders to port, starboer enging forvard, port enging back)

    the extention of tonels can slow dom the water from starboard enging / thru the roder. (in may exampel)
    ----------------------------------

    maby ai am ading a fueltank in the extention (it wold be nice to have 200 liters extra fuel)
     
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