Catamaran plans, who have I forgotten ?

Discussion in 'Multihulls' started by guzzis3, Apr 4, 2023.

  1. fallguy
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    fallguy Senior Member

    The stroke may have made building too difficult, but it is not our place to decide that..
     
  2. cavalier mk2
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    cavalier mk2 Senior Member

    My jest was only about Guzzi3 always running into ply boats. The time angle was in reference to the work of a 40 footer redo compared to the 27. Sorry if that wasn't clear.
     
  3. guzzis3
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    guzzis3 Senior Member

    It's all good. I saw the humour and I'm really not that thin skinned.

    The Horstman seems to have sold anyway.
     
  4. waterbear
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    waterbear Senior Member

    Guzzi,

    Have you considered Waller's TC750? It's plywood, but I'm guessing it could be converted to foam without too much trouble? Perhaps it's not everything you want in a boat (eg full bridgedeck, a bit small), but it does seem to have everything you say you need.

    See attached for a picture of BHD #5 of the TC750, situated between the forward double bunk and dinette. I've blurred and slightly distorted the image to protect Waller's IP, but at left you can see the door to the head (with dimensions) and get a feeling for the volume of the space. Even with the raised floor (which lines up with the upper chine) there is about 1.9M headroom in the hulls at the bulkhead and nearly 1.5M over the dinette.
    tc750_1.jpg tc750_2.jpg
     
  5. guzzis3
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    guzzis3 Senior Member

    Thank you for the suggestion. If I went with one of his designes I'd go the 880. I can work around most of the conversion to foam. Yes the rounded hulls are more work but it's not that much in the scheme of things...The problems with a full width cabin remain in both cases anyway.

    I have had communications with Mr Woods and it seems we have a solution. I hadn't posted this here because the conversation isn't finished yet, but he is ok with me growing the Saturn to increase it's load capacity and putting LAR keels on it.

    He has suggested casting the bottom 3 chines in solid glass which was a surprise. I'm thinking of making a mold to do this in one shot rather than taping 3 flat panels together, but I am at a friend's place atm so when I get home I'll try to build a computer model calculate displacement and so forth.

    I will update this thread when I've got it sorted.
     
  6. waterbear
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    waterbear Senior Member

    That's good news! Now you have a path forward.
     
  7. fallguy
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    fallguy Senior Member

    The forward sections of the Skoota are all solid glass.

    I used 1/4" exterior plywood and duratec surfacing primer and partall wax and #10 spray to get it to release...but you have to bond the bottom to the side and maybe in the same skins, so access is the only issue. I have a solid memory of the ankle pain I endured glassing that in...and a bad attempt at applying peelply too close to gel time with bad results.

    It might be easier to build half moulds and bond the two pieces with tabbing. I'm sure Woods has a plan. Hopefully not in the groove, if you will...or able to reach down is okay, too.

    But solid glass bottom working inside deeper down is really hard work...you've gotten a friendly warning..
     
  8. waterbear
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    waterbear Senior Member

    Seems like you wouldn't be able to avoid this? If building in any kind of panel you would need to tape the upper chine after installing the side panel, which is the point where it becomes a pain in the a**. It seems the same whether the bottom panels are made in a mold or taped together individually. Even with two hull halves you need to tape the keel.
     
  9. guzzis3
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    guzzis3 Senior Member

    I am not entirely sure what you are saying there.

    I ASSUME you are talking about access inside at the bow ? If that is the case it shouldn't matter about the build method, that is just a difficult place to access regardless of material. Try doing repairs to a ply boat in that area when it's 15 years old and there are bits of rot in the structure...There are good reasons for my hatred of ply boats...

    Anyway there are problems with everything. My concern is more about the layups he's suggested. The solid glass will only be about 3mm/ 1/8" which isn't exactly ice breaker territory but I guess it's ok...I've not been sleeping well so a bit tired atm. When I am more coherent I'll do some modelling and see how it all looks.

    Thank you for the thoughts.

    Edit: Which one did you build again ? and how is the bow resolved ? Does it have a small bulkhead just aft of the nose and solid fill shaped to the rounded or pointy nose ? then glassed over ? like the sail boats ?

    Edit 2: I had a poke around the scoota build pics and vids. It looks like the chine is a lot higher and the bow is pointy. Saturn etc finish short of the bow with an angled bulkhead wide enough to allow some access and the crash area I mention above. In the Saturn build photos 1 there is a pic img 0168. It shows the bow. The darker bit to the left is solid timber in that case. Immediately aft of it is a bulkhead. Behind the bulkhead the void starts, so no inside access forward of that. That bulkhead is only 26mm at the chine but it's 200 deep and gets wider above. Yep it will be tight, it will be a pita but I'd already looked at that and I think it's doable.
     
    Last edited: May 25, 2023
  10. fallguy
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    fallguy Senior Member

    A moulded crash cone is the way it should be done, then the area you start is maybe 6" wider. But the key is the chine height of the 2nd chine. If you can reach in or not from the side. I could not...

    I enjoyed the build, but the hand glassing forward part sucked.

    <balance of comment was sent privately>
     
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  11. waterbear
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    waterbear Senior Member

    Alternatively, just point that chopper gun in the bow and squeeze the trigger :D

    images (2).jpeg
     
  12. oldmulti
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    oldmulti Senior Member

  13. guzzis3
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    guzzis3 Senior Member

    I have had another stroke. Survived Ipswich hospital, just, now recovering.

    The plans for the big jarcats were lost as far as I know. RT's son sells the smaller boat plans. I'd love to see the boats in person or the plans. He drew nice boats. The J5/6 were great but have the usual ply problems. My J5 had issues.....
     
  14. oldmulti
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    oldmulti Senior Member

    Guzzis3. Good to hear you are OK and hope your recovery goes well. Please continue to post as you add a lot to these threads.
     

  15. waterbear
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    waterbear Senior Member

    Guzzi, very sorry to hear that. Hope your recovery goes well!
     
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