Trimaran motorboat / stabilized monohull

Discussion in 'Boat Design' started by Eric DEBORDE, Oct 12, 2009.

  1. Eric DEBORDE
    Joined: Oct 2009
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    Eric DEBORDE Junior Member

    Some pics of my 10m proto and drawing of the futur 12m.
    On the proto :
    The center hull is 80 cm wide, the amas are 20 cm wide.
    The hull is 500kg in plywood/fiberglass.
    The 60hp outboard make her going 22 knots woot / 17/18 cruise.

    Does somebody made something similar to share numbers with me ?

    Sorry for my bad English, I am a french frog! :p


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  2. Ad Hoc
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    Ad Hoc Naval Architect

    Very jealous of your beach!!!

    How much does she weight?
     
  3. marshmat
    Joined: Apr 2005
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    marshmat Senior Member

    Hi Eric, welcome aboard :)

    Quite a stylish thing, ain't she? (And I, too, am jealous of your beach ;) )

    Rick Willoughby (member on here) has been tossing around some variations of a "faux-tri" concept with some similarities to your hull. And on the larger side, one of the U.S. Navy's new Littoral Combat Ships also uses a similar tri-hull configuration.
     
  4. Tcubed
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    Tcubed Boat Designer

    Pas mal. C'est en bois?
     
  5. Fanie
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    Fanie Fanie

    Interesting design ! If you have more pictures it would be nice to see more of it.

    The rest of you should note that Eric is a very clever person - note the fishing rods on his boat :D
     
  6. Eric DEBORDE
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    Eric DEBORDE Junior Member

  7. HJS
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    Location: 59 45 51 N 019 02 15 E

    HJS Member

    Figures?

    10 m wl, 22 knots with 60 hp?
    Can't be correct!
    What total weight?
    What prop?



    js

    www.sassdesign.net
     
  8. marshmat
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    marshmat Senior Member

    Eric's hull dimensions and general below-water shapes are pretty close to those of a tri I'm working on now, although his is 2 m longer on the main hull waterline. If his bare hull is 500 kg, I would expect maybe a hair over a tonne (say 1000-1200 kg) with motor, equipment, fuel and a couple of people. (Eric- can you confirm your actual weights?) From my own calculations, 20 knots or so for a tri this size on 60 hp is not at all unreasonable.
     
  9. Eric DEBORDE
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    Eric DEBORDE Junior Member

    Weight empty / no motor 500kg

    60hp 2 stroke yamaha 102kg
    Varta 55Amp 15kg ?
    fuel 100 kg
    hydrolic pump cylender and auto pilot 10/12kg
    aluminium anchor and chain 15kg
    extras 100kg

    TOTAL : 850kg empty

    22 knots wot is with 2 frogs 70kg and fishing gears for a total of aprox 1000kg
    Cruising at 4000 rpm with 17"pitch prop give 17/18 knots depend on waves.

    Cruising at 4000 rpm with 7 people and camping gear for a total of aprox 1600kg give 15/16 knots

    I should try a 15" prop but can't find one !
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    That puts it around 60hp/tonne

    Looking at my chart of old boats and sea trial data, that gives around Tq of roughly 4....this equates to 22 knots...so yes, stacks up.

    With 7 froggies....(and their cheese, wine and bread too?? :) )...roughly 17~18knots..so again, not bad, stacks up with other trials data of this "type" and "size".
     
  11. Nordic Cat
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    Nordic Cat Senior Member

    Great looks, and I bet she's a nice dry ride in waves.

    Alan
     
  12. Willallison
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    Willallison Senior Member

    Fantastic Eric!
    I too would be jealous of your beach...if I didn't have access to similar ones myself;)
    The boat is somewhat reminiscent of "White Rabbit" a superyacht built here in Tassie... if on a slightly more...err... practical scale:D
    Please - more pics - particularly of the interior - I'm interested to see just how much space you managed to fit into (onto) such a narrow hullform.
    There are a number of people (myself included) who are working on variations to the stabilised mono theme. Your's is a fine example - congratulations!
     

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  13. mwatts
    Joined: Jul 2009
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    mwatts Martin

    Hi Eric,

    Nice looking boat. I was wondering about forward visibility though. How are you ensuring that?

    I am currently designing a trimaran myself. A lot smaller than yours.

    LOA: 5.90 m
    Beam: 1.95 m
    Draft: 0.40 m
    Power: 15 - 20 HP

    She'll be heavy though (about 1000 Kgs fully loaded), because I am designing her to be built from steel. I expect to get about 10 Kn @WOT with a 15 HP.

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  14. Manie B
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    Manie B Senior Member

    Eric i have just looked at your website and cannot find any pics of your boat on the water other than the 2 photoshop pics of the boat on the "beach" am i missing something?

    Your build pics are great - and if you were able to go from wooden hulls (April 2009 entries) to the water in 6 months you did remarkably well

    Your design concept is very interesting but it would be nice to see pics or video of the "tri" underway :?:
     

  15. Eric DEBORDE
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    Eric DEBORDE Junior Member

    Thank's all !!

    Martin, I think that lightweight is the key for economie ! "tri hull" structural shapes are easy to make very strong, much stronger than a clasic monohull. Make a balsa model of your boat and try to twist it !! You will see how strong it is ! I wouldn't go for steel.

    Manie, I will try to catch pics and video of the "tri" underway.
     
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