Small Tri's under 20', any mention of foils is banned..

Discussion in 'Multihulls' started by waynemarlow, Jan 13, 2015.

  1. rcnesneg
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    rcnesneg Senior Member

    Very very nice. I like the idea of that beam and the removable forward top. Not sure I'd want to sleep in there, even though you could lay down in there.
     
  2. Corley
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    Corley epoxy coated

    I agree, better to rig some sort of boom tent but the update gave a much better idea of scale.
     
  3. markstrimaran
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    markstrimaran Senior Member

    Nice thread on small trimarans.

    No foils on this one. Sole cat donors coming soon. I have been building it in my spare time for the last few yeas. It just now starting to look good. The canoes where quite a conversation starter.
     

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  4. rcnesneg
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    rcnesneg Senior Member

    Motor or sail on the motorboat/canoe trimaran?
     
  5. markstrimaran
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    markstrimaran Senior Member

    sail powered. 8 hp outboard

    Set up with two mast steps. One Bermuda and one aft masted. Currently trying out the aft mast stay sail rig.
     

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  6. waynemarlow
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    waynemarlow Senior Member

    Its interesting that the TC601 ( 6010 mm = 20ft ) recently released by Tim Clissold hasn't been raised in this thread as it is the epitome of what everyone has been writing about, a light weight all composite 20ft Tri, with a largish cabin for its size, with an F18 rig and hulls option to keep the costs down.

    I have to say I am a little surprised that nobody has posted it here or in the other 20ft thread as I think it does fill a lot of the brief of the T20 Trimaran class and is a very viable build for the home builder.

    [​IMG]
     
  7. upchurchmr
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    upchurchmr Senior Member

    Not everyone wants a cabin.

    I've not seen enough to think this is anything but an illustration. Lots of those.

    Who would want to go out on the bow of that?

    An why in the world would you use a reverse bow on such a fat boat, and not even have it match the intended amas?

    I've also never understood using the same rig on a boat 2.5X the weight of the original boat.

    Perhaps you can explain why if it is composite on foam why the cabin looks to have facets? Is there room to walk around the cabin to the bow without going on top?

    2 rudders on the amas or one on the main hull? Bow sprit?
    Centerboard/ daggerboard in the main hull, or 2 daggers in the ama?

    Sorry if I missed all this but the internet information is a little sparse to take seriously.
     
  8. markstrimaran
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    markstrimaran Senior Member

    on the water float test.

    Finally got the sol cats attached and float tested. 8 hp outboard only. As my aft stay spar need completed before I can set my mast. Fully loaded the out riggers Draft about 4". I have heard that they should be barely touching the water at rest. They can be raised up easily. Not sure if the performance would be worth the teetering toter. As it sits the boat is very steady.

    It is very slight angled very hull on the stern. I am anxious to see how it handles at planning speed. If the stern does rise up out of the water as planning. Then having the outriggers too high might create stability issues. Mostly from the bow very point acting like a rudder. If heeled over too far.
     

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  9. warwick
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    warwick Senior Member

    upchurchmr the facets in the cabin would be the computer program rendering, on a low accuracy setting.
     
  10. waynemarlow
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    waynemarlow Senior Member

    First hull in build at the moment, there should be piccies of the progress and a build blog about to go on line.

    The raked back bow does match the later F18's which have raked back bows, but the main reason to have raked back bows is not aesthetics but to get volume down low.

    The boat has been set up so that there is no need to go out on the bow other than if there is a problem, with a self furling and tacking jib and a spinny dowsing similar to the F18's with a single string launch and retrieve line. The plan shows small bow nets if the owners wishes.
    [​IMG]

    The boat is not 2.5 times the weight, the original F18's are 185kgs, the TC601 should be in that 250 - 280kgs without ancillaries such as an outboard or anchor. To be fair the F18's are a handful in anything above 10 knots wind with both crew needing to be out on the trapeze and depowering of the rig from about 15knots, with a bigger jib this boat should be powerful enough for the racer but not so powerful that the average sailor could get into too much trouble. A small Tri with a cabin is never going to be as fast as a Beach Cat but then its designed for fast comfort sailing rather than racing speeds.

    Facets I'm not sure what you mean, no you are not going to be able to walk around the cabin to go up front, you will need a lot more boat to be able to do that. This cabin is " biggish" for a 20ft Tri and yet with its wide rear, plenty of room for crew and will offer tight over night accomodation for 2 but to be honest most will day sail this boat and sleep over in a hotel if needed. It is big enough though for a bit of privacy for the girls or family if they get caught short.

    Rudders on the Amas and single centre daggerboard on the hull, it gives the most balanced handling I'm told and does give a bit of self governing RM with the daggerboard getting smaller as the central hull lifts out of the water.

    Removible bow sprit for ease of marina and trailering, together with folding on the water or trailer.
     
  11. Doug Lord
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    Doug Lord Flight Ready

    Whats the projected angle of heel with the main hull just clear of the water?
     
  12. waynemarlow
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    waynemarlow Senior Member

    Heel has been a contentious issue in the design process, enough that the folding system adopted will allow the owners to set what ever dihedral they want by altering the water stay length and or putting a block between the Ama and beam, a combination giving what dihedral you want.

    The more recreational sailor will want the floats to be just touching the water to stop flip flopping at anchor, the more racing orientated sailor will want one Ama clear of the water.

    To begin with we are going to try it with just enough dihedral to touch the bottom of the floats on the water at rest, as soon as the boats heels over under sail, one Ama should clear. Its something we will find out whats best once the first boat is in the water and under sail.
     
  13. Doug Lord
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    Doug Lord Flight Ready

    =================
    I'd say that IF you're planning on the main hull flying, you'd want to check the "just clear" heeling angle before it's built? There's a thread around here about that and the range is something like 10 to 26 degrees!
     
  14. rcnesneg
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    rcnesneg Senior Member

    The big cabin scares me away. The F18 hulls are really heavy too and don't help. That's the problem for me. If it can match a Tornado or F20 I'd be happy with it, but it probably wouldn't.
     

  15. waynemarlow
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    waynemarlow Senior Member

    As a little nugget of pre release information, the same design can be built as a 22ft boat which is where you would want to go for the Tornado and F20 hulls. It is something that is being worked on and will be released as soon as we can.
     
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