Minimalistic cruising multihulls

  • 08 Nov 2018 00:05
    Reply # 6893915 on 6892763
    Anonymous wrote:

    I guess making the overall beam a bit more is not an issue.  Of course in your part of the world you live outside most of the time?  And the large cockpit is ideal.  In my part of the world you need a storm and midge proof cockpit tent!

    Plenty of midges and sandflies here!  And the sun will eat you alive.  Skin cancer capital of the world.  You need to be in the shade at least, if you are exposed day in and day out. Screens are often needed too.  In the tropics, a cockpit roof with removable screens makes sense, sort of a Samoan style house, keep the sun and rain off you but let the breeze blow though.  So an open bridgedeck cat would work, as long as you had a roof over it.  Much better, actually than being stuck below in a sweaty cabin.
  • 07 Nov 2018 13:23
    Reply # 6892763 on 6886625

    I guess making the overall beam a bit more is not an issue.  Of course in your part of the world you live outside most of the time?  And the large cockpit is ideal.  In my part of the world you need a storm and midge proof cockpit tent!

  • 07 Nov 2018 00:07
    Reply # 6892192 on 6886625

    Hi Mark, I have seen this cat in Townsville, and have the free plans from TCP.  It is a very simple and economical boat, if a bit limited by its narrow overall beam and accommodations.  But it definitely deserves consideration as a minimalistic multihull for those with minimalistic budgets!.

  • 06 Nov 2018 14:03
    Reply # 6891283 on 6886625

    How about this



    Just love the simplicity of the construction method. 


  • 03 Nov 2018 23:55
    Reply # 6887371 on 6886625

    Thanks for that info David.  The Eco 7.5 certainly has a lot more accommodation than the Seaclipper 28.  Also, it will probably sit quieter at anchor in swell-prone bays, which are common in Queensland, despite both amas of the tri being submersed.  They are still veed in section and will depress a little as the swells pass.  Often, when I have been rolling heavily on Arion, with things flying around the cabin if not secured, I have rowed over to a friend's catamaran and was able to sit my cup of tea on the table! 

    And I like the look of the Eco, though my traditionalist friends, who think Arion is as cute as a kitten, are appalled.  I like conventional monohulls with sweet sheers, but have always enjoyed thinking outside the box too.  When I first saw a picture of Jester as a teenager, I was thrilled.

    If I get serious about the Eco 7 I will talk to Pete Hill, given his wealth of experience with this rig.  I was thinking, if the sloop rig has 24 sq metres in total, I might make each sail 15 sq metres, still a smallish and easily handled sail, and reef early.  Make up for not being able to set a screecher!

    But unless I find a buyer for Arion it will remain a dream.

  • 03 Nov 2018 19:28
    Reply # 6887156 on 6886625

    My real inspiration for building the small catamaran came from the book 'Travels with Miss Cindy'. This is a Kindle book which tells the story of a rather extraordinary voyage throughout Central America in a tiny 4. something meter bridge-deck sailing catamaran. If you do a Google search for Miss Cindy catamaran you will also find a lot information. I really enjoyed the book and have reread it several times now. The book is available through Amazon

    I have owned and done a lot of sailing on two trimarans, a Jim Brown designed Searunner 37, and a Newick Val 31. For my small cruiser I chose the catamaran over a trimaran because I will get a lot more accommodation for the same, or even less length of boat, and it seems better to build only 2 hulls rather than 3.

    Graham, a bi-plane rig would probably fit easier on the Eco 7.5 than it would on the Eco 6 as the masts should not interfere too much with either the galley, or the head. In playing with ideas for my possible bi-plane rig I just divided the total sail area by 2 to give the area of each bi-plane sail. I don't know if that is the correct way to do it.

    Last modified: 03 Nov 2018 19:40 | Anonymous member
  • 03 Nov 2018 08:57
    Message # 6886625

    I am having fun at the moment contemplating building a tiny catamaran or trimaran for singlehanded coastal cruising in Queensland.  Although it is by no means a definitive short list, rather just an early appraisal, the two boats I am looking at are quite different, the Bernt Kohler Eco 7 cat and the Marples Seaclipper 28 tri.  Considering junk rigs, I envisage the Eco 7.5 with two bilateral masts (one in each hull), at the position marked 8 on the drawing, with Arne-style cambered sails.  The total sail area of the standard sloop rig is about 24 sq metres , and I find myself wondering how much sail area each junk sail should have.  Any ideas?  The Marples tri would be much cheaper and simpler to build, though the accommodation would be strictly for one, unless I added little wing decks.  The single junk mast would be placed just forward of the forward beam, and again would use an Arne style cambered sail.  I'd have to get rid of the centreboard and maybe put daggerboards in the amas (outer hulls), which has the advantage of providing significant lift.    When I emailed the designer, John Marples, I included a photo of Arion under sail, just for fun, and he was very supportive of putting a junk rig in.  He also sent me a huge amount of free info and drawings.  Kohler's $20 study plans were poor value by comparison.

    You can click on the images to look at larger copies of the images in my photo albums..

    Last modified: 03 Nov 2018 08:58 | Anonymous member
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