Boxy Fisher Catamaran

Discussion in 'Multihulls' started by Fanie, Mar 11, 2009.

  1. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    The four beams...
     

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  2. Manie B
    Joined: Sep 2006
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    Location: Cape Town South Africa

    Manie B Senior Member

    Looking good my man
    its progress :D

    i cant post pics because all i have done is farking sanding and more sanding
    i am not going for a fancy finish - that i leave for Wynand, all i am doing is just to be kinda ok

    but as you know full well
    when you work alone
    it takes time - lots and lots of time :(
     
  3. Fanie
    Joined: Oct 2007
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    Location: Colonial "Sick Africa"

    Fanie Fanie

    And I've made a cutout in the one beam where the pin housing fits into.
    The jig saw's steel blades are not going to last very well, that is some serious glass there.
     

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  4. Manie B
    Joined: Sep 2006
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    Manie B Senior Member

    i found blades that are for "aluminium"
    very coarse teeth and at slow speeds lasts MUCH longer than "steel" blades
    this is on epoxy - glass- carbon fibre and aramid/kevlar

    aramid is a nightmare to cut or sand
    you basically have to trim it with a stanley knife or scissors
    the more i work with these materials the more i like aramid - this is a SERIOUS man made fibre
    carbon snaps - aramid bends like steel
     
  5. Manie B
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    Manie B Senior Member

    just my 2cents
    when you glass those pin housings onto the beams
    put ALL 4 beam and pin assembies onto a single shaft both ends
    check that the 2 shafts are paralel and lined up X Y Z on shaft centres with a laser
    then when you spilt - ANY shaft will line up any direction
    crooked pin housungs will give "tight" joints
    line boring on a cnc machine centre also works - but is costly - all 4 have to be done at the same time - and very few machines can "drill" thru those 4 pin housings at the same time
    i did swing arms for a large screen shaker and it worked
    2 shafts @ 1.8m long at 2.0m centres set up at 0.1mm on the ends gives an accuracy of 0.01mm in the middle which is all you need
    your pins probably would have a 0.5mm play anyway - guessing ?
    i dont know what the expansion factor is for that glass in the sun ?

    have fun
    cheers :D
     
  6. Manie B
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    Manie B Senior Member

    still not clear on those joints?

    is the one beam a pin housing as shown on the pic and the other beam 2 flanges (top and bottom) with the pin going thru ? to form a hinge
    male and female?
     
  7. Fanie
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    Fanie Fanie

    Hello Manie,

    Why don't you come and have a look ? You're just around the block from me.
     
  8. hoytedow
    Joined: Sep 2009
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    Location: North of Cuba

    hoytedow Carbon Based Life Form

    I bet you are relieved to get that task of laying up those beams behind you.
     
  9. Fanie
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    Fanie Fanie

    Hi Hoyt,

    You won't believe how easy it gets done ! It's cleaning the frigging stuff afterwards I dislike. I cannot imagine doing the same by hand...
     
  10. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    Cutting the beams turned out to be more work than making them.

    The four hull ends has been cut, and one end of the one hinge. Three ends to be cut before I can begin to glass them in. I also have to line them up properly so they hinge horizontal.

    It is too hot to work with the glass. Will have to wait for some cooler weather.
     

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  11. hoytedow
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    hoytedow Carbon Based Life Form

    Still nice work, though. Winter here. Big blizzard with cancelled flights across eastern seaboard.
     
  12. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    Nice weather to finish the fiberglass work, indoors that is.

    I planned a couple of projects to work on for December since it's quiet and one can do your own things for a change. Fat chance. People in and out here all the time. The beams were supposed to be finished by now or that was what I thought.

    I realised yesterday that half of December has past already and not much in the lines of my own things got done. This morning it was a week later.
     
  13. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

    Yeah, Time flies like an arrow. Fruit flies like a banana.
     
  14. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    This is one of the beams lined up.

    Inching foreward.
     

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  15. masalai
    Joined: Oct 2007
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    Location: cruising, Australia

    masalai masalai

    Nice going, This may be the part where time, patience, precision and care are rewarded...
     
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