seaworthy, bigger i-550... suggestions?

Discussion in 'Sailboats' started by peterchech, Aug 10, 2011.

  1. Munter
    Joined: Jul 2007
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    Munter Amateur

    Nice work - an amazing similarity to the i550, at least at a superficial level.
     
  2. jelfiser
    Joined: May 2006
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    jelfiser Senior Member

    1 person likes this.
  3. luckystrike
    Joined: Feb 2010
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    luckystrike Power Kraut

    Working Title: Coastline Flyer 6.5

    Hi Munter,

    I hope you mean ""superficial" in a technical manner and not in a social one! :D

    Otherwise you are right. the optics are quite equal, but thats just the fact that the form follows its function. If you want lightweight, high performance, minimum costs and fast construction with the 3 panel plywood hull of a sharpie, your room for individuality is really small. You have to cut everything down to the absolute minimum. From overhangs to structure. Remember that you have to take care of the standart 4'x8' measures of plywood sheets as well.


    Everything that is a design issue, really is a independent aspect of this boat. Trim, volume distribution, flow of water around the hull etc.

    Grrreetings from the North Sea Coast, Michel
     
  4. luckystrike
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    luckystrike Power Kraut

    Dear Jelfiser,

    Nice looking boat, no question! But we are talking here about a total different kind of design concept.

    strip plank/pvc-wood sandwich rounded hull vs. plywood 3 panel sharpie hull. Do you have just a slight impression what that means in the amount of costs and man hours?

    Michel
     
  5. fcfc
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    fcfc Senior Member

  6. fcfc
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    fcfc Senior Member

  7. timber
    Joined: Jul 2004
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    timber Junior Member

    I like your drawing.

    I am the owner of the i550 design and have experience enough to not just expand the i550 to a 650, 750, 850, 1100, 2200 et cetera. sometimes it is hard to resist the temptation of what if we...........
    It is not simple even if it looks simple. Wind, water and hull shape are complex in relation to each other. I don't know enough yet to design a sailboat.
    For the small number of potential builders of any boat I think it necessary to help as much as any of us can to encourage and inform these brave souls of the home workshop.
    TR
     
  8. luckystrike
    Joined: Feb 2010
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    luckystrike Power Kraut

    I agree, when I made my first thoughts about a scale up with the little information I had (no building or lines plan) it was obvious very early that my Costline Flyer will be a total independent project with individual lines.

    Michel
     
    Last edited: Sep 6, 2011
  9. luckystrike
    Joined: Feb 2010
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    luckystrike Power Kraut

    Just a little update

    Hi Folks,

    just a little update to this thread. Design work is finished and I decided to build a model in 1:5 scale, equipped with RC. I did this very succesful with my coastal sharpie and it was a satisfying experience.

    The mayor differences to the posted images are that the whole cabin will be moved one foot aft, cutting the cockpit length down to 7' and maximising the cabin space where the boat has its max beam. There are 4 full size bunks now.

    Here are the latest photos of the model built. I hope I will have the model sailing in the beginning of september.

    Coastline Flyer 012.jpg Coastline Flyer 019.jpg Coastline Flyer 022.jpg Coastline Flyer 033.jpg Coastline Flyer 037.jpg
     
  10. SteveMellet
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    SteveMellet Senior Member

  11. luckystrike
    Joined: Feb 2010
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    luckystrike Power Kraut

    A friendly hello,

    this thread is titled "seaworthy, bigger i550 ... and is looking for a cruiser racer, not a mini cruiser for offshore adventures. The aviateur is designed to be an offshore boat and a lot of features to underline this.

    The ideas and details are clever, no question, but the most of them are useless for a speed machine with a little cruising comfort.

    This kind of boat is normally operated by people who have not so much money in their pocket. So, in my eye's its essential to have good bunks on your boat where the crew can sleep and a little stove to make hot drinks. Just to keep the costs down. Even a little nav station and a porta potti is worth of thinking if you want to sail longer coastal races, but the first wish for a Cruiser Racer is Speeeeed. I think I have found a good compromise between Speed, Comfort and Costs.

    Expect that the 3' longer CF 6.6 will be equal, or even cheaper in costs than the Aviateur. Just in Materials, not in man hours that will be lower anyway.

    Even the trailer for the CF, which has to be inclineable to reduce the width of the boat to be legal (just 25cm in Europe), can be built at home if you have a fellow welder, thanks to the lifting keel and the flat bottom of the sharpie hull.

    Ragards, Michel
     
  12. SteveMellet
    Joined: Sep 2009
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    SteveMellet Senior Member

    Hi Michel,
    Apologies if I offended, If I read the originator of this thread`s requirements, he is looking for a bigger boat than the i550, but with some similarities, ie S&G plywood build, easy to trailer, some small comforts below decks, and good speed. His stated use is coastal cruising and short open water journeys, with that in mind, outright speed can be sacrificed for other attributes that would make a better all-round boat for his intended uses. A scaled up i550 design will do the job he is asking, but so would many other boats, Aviateur included, though perhaps it may be too slow for your liking. I would have also liked to suggest Dudley Dix`s mini-transat cruising version, though with that beam a tilt-trailer would be a necessity, and make trailering more difficult. And someone else already recommended it. I would personally choose this one for the speed potential, but would prefer Aviateur for simple launching (no tilt-trailer).

    A boat I`d seriously consider if I were looking in this market is Pterodactyl by Colson Yacht Designs, though not all S&G built, the bottom is strip-planked, with a centreboard instead of a lifting keel, which makes sense in shallow sandbank areas.
    http://www.colsonyachtdesign.com.au/?pid=13

    Let`s keep an open mind here, there is more than one design that can fit the original poster`s requirements.
     
  13. luckystrike
    Joined: Feb 2010
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    luckystrike Power Kraut

    Steve,

    sorry, it was late last night and I had to correct one or two word in my last post today. Perhaps you read it again.

    No, Iam not offended. I re-read the opening post and you are right ... Peter is seeking a boat with a little space for living and a better safety. I interpreted his statemant that he wants to keep the advantages of the i550 (speed, low cost, easy building) and want to add his wishes the original can not provide due to the fact that its too small. You cannot even sit inside a i550. In my Eyes this is a planing cruiser racer, a sportsboat with bunks, nothing else.

    I think you have never used a tilting trailer, this is nothing difficult. Just one additional steel or aluminium frame and a few bolts. you can tilt the boat by hand upright for rigging and slipping. It has nothing to with the trailerability of a Minitransat with 2 Meter Draft. CF has a lifting keel so it lays flat on the trailer.

    I stayed with the sharpie hull concept because I simply like it! A good compromise between building time, costs, and fun.

    If I take this as my base and compare it to the mentioned alternatives there is one big drawback minimum on each design

    Didi Mini Cruise: Fail in cost and labour. Please compare the material list on the Didi site to my calculation. Take a look at the building blog of the Didi and watch the Gougeons Brothers building a i550 on youtube.

    Colson ... a 7 meter very sexy looking trailer sailer??? okay but its round bottomed ... again manhours and costs. I would have suggested the colson 650 as a alternative, this boat is nearer at the wishlist.

    Enthusiast Serpentine 5,51: A cruiser with greetings from the 1960s and '70s, but in no way a cruiser-racer, able to plane.

    Fracois Lucas Mini CP: ist a minitransat and therefore expensive by nature because of their high power rig and the 300+kg of ballast, canting keel etc.

    Aviateur: beside being a cruiser for transatlantics (designers words), if you have the same building costs and -time and you definetly don't want to cross the ocean ... would you build a 5,7m Boat or a 6.6m?

    I think I have an open mind for alternatives, but please stay with the given requirements.

    ok, here is a roomier microcupper, called "Micro - B"

    http://www.segger-boote.de/uebersicht.htm look at "Trailerkreuzer" and then down to Micro-B

    Best Regards, Michel
     
  14. Andy
    Joined: Aug 2003
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    Andy Senior Member

    Did you finish you model Michel? I've been playing around with sharpie type hull designs too, fascinating
     

  15. zolty
    Joined: Nov 2018
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    Location: Isle of Man

    zolty New Member

    Hi Luckystrike

    Sorry to bother you about the 2011 year post buy i am struggling with finding any more info about your boat.
     
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