Cross Indian ocean in 4 meters dinghy sailboat

Discussion in 'Boat Design' started by Nauticals, Mar 4, 2018.

  1. kerosene
    Joined: Jul 2006
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    Location: finland

    kerosene Senior Member

    I would check small ocean going boats for visual reference.
    I doubt you will see wide teansom on any. What is the reasoning for it? How does it act when hit by a large wave diagonally from behind?
     
  2. Nauticals
    Joined: Mar 2018
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    Location: World

    Nauticals Junior Member

    i think more beamy at the back it is better. I understand that less beamy at the back it is better for maneuvering. I have seen a lot small boats and the most are curved as you said. I believe that this design is not ideal for small boats and big waves despite that this happening in many designs but designs that haven't been designed for offshore sailing i believe, but again im not sure about it, it is what im thinking of and open to suggestions (despite what i respond i definitely gonna think more what you said and check it). Sailing long distance offshore in a small boat, i count more on the so called downwind sailing where the waves and the wind will be always at the back.

    @kerosene I would like to hear what will happen if a large wave hit diagonally from behind and what do you think about it, thank you.
     
  3. JamesG123
    Joined: Mar 2015
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    Location: Columbus, GA

    JamesG123 Senior Member

    Nauticals: What you are described is a "dagger board" keel. If you can physically raise and lower the keel fin, there is no need to pump anything in or out of it.

    You seem to be coming up with a lot of apparently needless complications, most of which are either impractical or imprudent. You REALLY should heed the advice you are getting on this board. You can daydream all you want, but you really need to go find yourself a cheap old sailing dingy and get hands on experience with how real boats behave and what you actually need to do before you even think about cutting plywood for your dream.
     
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  4. David Cooper
    Joined: Jan 2015
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    David Cooper Senior Member

    But he is listening, and he's making progress towards something practical and non-lethal - it's a massive improvement. It's even heading in the direction of being conventional (if the outriggers are gone and the lead isn't pumped).
     
  5. Waterwitch
    Joined: Oct 2012
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    Waterwitch Senior Member

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  6. MurphyLaw
    Joined: Aug 2012
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    Location: Mars

    MurphyLaw Senior Member

    The weakest link will be YOU. Many have sailed similar adventures and their logs of their journeys are published online, Yrvind's is the best.

    His boat IMO was the strongest built and it went to the Cape Horn a few times in stormy weather, make sure your rudder is as strong as his.

    Welcome to Yrvind´s website http://www.yrvind.com/

    Read all his logs. That cover stuff like being stuck in storms around Cape Horn and not being able to take a **** for 2 weeks then having to stick a spoon up his bum to dig it all out.
    Take note that if you don't allow your skin to dry then after a week it will start falling off and get infected.

    Before you spend a cent, try and get someone to take you out in a small boat in a storm. Fear is probably your greatest danger, once you become fearful you will make poor decisions that could kill you. If you get bad sea sickness in a storm and cant nurse yourself things could quickly go south.

    I am going to try a similar adventure in the not so distant future, I took up FreeDiving to get in top physical shape and in case I have to dive to the end of the mast to recover from a capsize., I highly recommend taking a beginner course.It teaches you how to control panic and fear when you are in and underneath water and it is easy with a few months practice to hold your breath underwater for 3 minutes compared to the average 1 minute without training. You will also be able to spearfish the many fish that use a boat on the ocean for shade. If you are not confident and comfortable both in and out the water and with your boat it will be hell and you will break stuff.

    Read ALL of Yrvind's logs, a gold mine of information on boat construction, navigation and staying alive.

    Log

    Here is a boat with plans to build that won a competition for best expedition boat that can handle heavy seas.
    [​IMG]

    DC-3 Trimaran Model Wins WoodenBoat Design Challenge III | Small Trimarans http://smalltrimarans.com/blog/dc-3-trimaran-model-wins-woodenboat-design-challenge-iii/

    [​IMG]


    [​IMG]
     
    Last edited: Jul 14, 2018
    David Cooper likes this.

  7. JSL
    Joined: Nov 2012
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    Location: Delta BC

    JSL Senior Member

    Suggest you check out John Guzzwell and 'Trekka'. Trekka was about the same size (20') and did a circumnavigation about 65 years ago... (and 2 more subsequently.)
    A lifting keel is nice but keep in mind the added complexity to a 'challenging' voyage.
    Your broad transom is good for performance but may? be less forgiving in following/quartering seas. One factor to use as a guide is trim: if a weight shift (you, in cockpit during the day, moving for'd to sleep at night) changes trim more than 2% ( about 4"), the hydrostatic values (and therefor handling characteristics) may change.
     
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