building new amas/floats from recycled beachcat hulls

Discussion in 'Multihulls' started by trip the light fandango, Apr 23, 2019.

  1. brendan gardam
    Joined: Feb 2020
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    Location: east gippsland australia

    brendan gardam Senior Member

    Thanks for the reply. I might give it a miss unless it has really good rigging and sails. Old multi had a fair bit of info but a member on 1 of the facebook forums knows the boat personally. His mate used to race it at hastings and did the conversion there.
     
  2. brendan gardam
    Joined: Feb 2020
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    Location: east gippsland australia

    brendan gardam Senior Member

    Following your tri with interest, hope you get a second wind and finish it. It would be great to see a video of it sailing.
     
  3. trip the light fandango
    Joined: Apr 2018
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    I deliberately built re-enforced dagger board cases into these floats that would account for 12kgs 26lbs plus each, centred in each hull.
    The plan was /is to one day set up foils/ diagonal boards., when I've forgotten what a drag working on boats is .
    With out spending lots on Kevlar and carbon and having other floats engineered to manage the loads no other proposals offer this option.
    Of course this assumes that my cases will work with foils.. but they can be removed if they don't and replaced with conventional boards.
    No other floats suggested offer dagger boards either. 40 kgs extra spread over 21 1/2ft doesn't seem like that much to me.
    Thanks to all for the input , I'll plod on doggedly..regards.
     
  4. upchurchmr
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    upchurchmr Senior Member

    Tornado hulls might not be perfect per the discussion above, but they come with centerboards already installed. I doubt they weight over 10KG with centerboard.
     
  5. Doug Halsey
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    Doug Halsey Senior Member

    I think Tornado hulls are actually a lot heavier than that. At least 40kg each, without centerboard.
     
  6. upchurchmr
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    upchurchmr Senior Member

    Doug, you are completely right.
    I meant to be talking about the centerboard plus case, to compare with the 26KG in #78 post.
     
  7. trip the light fandango
    Joined: Apr 2018
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    The photo of the centre case shows the 3 skins, although the bottom 2 are well glassed in when the hulls were upside down, I now have to fill those joins from the inside.
    I think I'll try a thinnish mix of fumed silica and flock that can run into the gaps when upright. It's for added strength but mainly to stop sand, water and stuff from getting caught there. I tried gorilla glue[polyurethane] on one part I had better access to on the rear of the case, will see the results tomorrow.*
    The sun shows the hull shape profile , they have a lot of freeboard deliberately, they will be angled at more than 7 degrees to cut down on windage from the windward flying hull.
    I had the hulls better faired before I had to repair any spots where the Qcell didn't mix well enough, I hope to improve on where they're at now, but they are probably fine for my needs.

    These float photos are of the centre hull facing side of the ama, blending the asymmetric into the symmetric of the maricat was tricky.
    ps. That ugly step in the stern should pretty much disappear with the rudders in place but I may glass in a better transition if I can't bare it.
    pps. it looks horrible from that angle.
    *I soaked some some dyneema in the fumed silica mix and pushed it into place with a long piece of quad, it worked well.
     

    Attached Files:

    Last edited: Sep 3, 2020
  8. Corley
    Joined: Oct 2009
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    Location: Melbourne, Australia

    Corley epoxy coated

    I'm trying to get my head around the need for float daggers. If your Trem is like mine the daggerboard exits through the cockpit sole. Extra daggers just seem like more weight, drag and complexity for no real benefit on a simple boat like a Trem. I guess they could come in handy if you wanted to dry out more level though. Being the weight obsessor I am I was looking at the very average H16 hulls on mine the other day and thinking of removing the rudder hardware, no real need for it to be there and it does weigh something :).
     
  9. trip the light fandango
    Joined: Apr 2018
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    They certainly add more weight and complexity, there are a few reasons why I went ahead with them, the H18 hulls have them, I'm expecting to be able to make way a few degrees closer to the wind, and I want to try making semifoils for a more comfortable passage when the wind is 15knots and over.
    And reading all the ideas on this site and others filled my head up with possibilitieso_O:):confused:, ha.


    My old H16 hulls have drawn out sterns that follow the form and come to a blade like end.,when I cut them up they were heavily made though.. Your H16 hulls may be donor hulls that had the hardware left on just in case..?
    It's getting closer to epoxy use temps finally,i didn't think of being able to dry out level, thanks, I may end up plugging them with light blanks if the benefit is marginal.
     
    Last edited: Sep 3, 2020
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  10. Corley
    Joined: Oct 2009
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    Location: Melbourne, Australia

    Corley epoxy coated

  11. trip the light fandango
    Joined: Apr 2018
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    I haven't been able to do much except lay one side of a float/amas with dynel/epoxy, my time at the slipway is up.
    The weather hasn't helped it is wetter than usual with only a few days over 22C/71F, when I tried laying some dynel matt with epoxy and there was a couple of little sticky spots which I am desperately hoping will settle down. It is covered in clear plastic and probably sweated or attracted some moisture , it's minor but disconcerting.

    While I'm comfortable using polyester out in the open, epoxy is nowhere near as versatile when it comes to outdoor work.
    I'll fix up the house a bit more,and make some other compromises for the wife[throw away stuff] and move the boat into the driveway where I can get more protection from the elements.
    I'm looking forward to getting set up at home and having less distractions and proper access. I bought an electric winch to do the moving .
     
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  12. Le_skipper
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    Location: Pointe-Calumet

    Le_skipper New Member

    I am building a 22 feet trimaran using Mystere 6.0 floats and rig. I removed the centerboard cases and decks, reinforced the interior and added new decks (12 oz ±45 glass / 9mm foam / 6oz fabric) with nice rounded edges. The modified hulls weigh 50kg each.
    I found it takes a lot of time to repair the old hulls (dings, cracks, etc...) and sand the old gelcoat (very very hard stuff) in preparation for paint.
     

    Attached Files:

  13. trip the light fandango
    Joined: Apr 2018
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    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    Hi Le skipper and welcome to the forum, 50 kgs is a nice light finished weight, well done. I am beginning to regret using epoxy I thought I would need it to seal in the polyester mix microballoons so they didn't saturate. I've had some made up with polyester in water for 3 months as a test and they show no sign of sinking.. My boat sits on a mooring . I found gel coat very hard too.
     
  14. redreuben
    Joined: Jan 2009
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    redreuben redreuben

    You know the best way to sand gelcoat is wet and dry yes ?
     

  15. Corley
    Joined: Oct 2009
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    Location: Melbourne, Australia

    Corley epoxy coated

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