15 foot sports recreational dinghy

Discussion in 'Sailboats' started by kvsgkvng, Jul 14, 2012.

  1. messabout
    Joined: Jan 2006
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    messabout Senior Member

    Yur drawing in post #94 has a boat that looks a lot like a Windmill, a boat of similar size and general appearance. If you can find details of the Windmill they will be useful as a study plan. That class boat was a very spirited performer for what it was, which was mainly an easily built boat on a budget. It could be described as a bit tender but if sailed competently there was no problem with lumpy water. The Mill would plane when conditions were favorable. Gaze at that one for a while too.
     
  2. Stephen Ditmore
    Joined: Jun 2001
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    Stephen Ditmore Senior Member

    If someone who has sailed both a Comet and a Windmill wanted to write a comparison, that would be interesting. Personally I'd go a little wider than either (or just design a multihull). Perhaps also Johnson 18 vs. Viper 640 (updated version):
    http://www.johnson18.org/gallery.html
    http://www.viper640.org/photos
    or a comparison of any of the above to the Vanguard/Bob Ames designs:
    http://www.bana.com/production.htm

    My new Professional Boat Builder just came and there's an article on the work of Bruce Kirby that includes a lines drawing of the Laser.
     
  3. kvsgkvng
    Joined: Jan 2012
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    kvsgkvng Senior Member

    loneliness


    The reason I am not that active anymore in this thread is that I learned what I wanted to learn up to the level of my interests and made important conclusions.

    Considering your wide and undetermined comments without any constructive suggestions, proclaiming common truths and having absolutely no value behind them, I learned to just ignore you, PAR, like I ignore street preachers or zealous online trolls.

    Enjoy good weather and my best regards to you (ffozzub).
     
    Last edited: Mar 16, 2013
  4. Submarine Tom

    Submarine Tom Previous Member

    That about sums it up.

    Well said.

    Fair winds and good seas to you.
     
  5. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Maybe I've been a bit harsh, but the presentations and comments have been deserved. The original posts with the hull, which had the aft buttocks shaped like the inverted hood of a '52 Buick where, well, just awful from a hydro point of view. So, the usual suggestions to do some study and books like "Elements" where offered, by many. But after the OP said he'd studied "Principles", he offers up new revisions of the same obviously flawed design, with the entry changed by a 1/2" or slightly flattened something or other. More suggestions to study then presentations of wildly different, Snipe like shapes appear, again with obvious flaws, like 4:1 SA/WS ratios, so the banter spiraled in a predictable fashion. My participation on this thread has been roughly one per page of posts (less than 10% of the total posts). With the Op's being about 40% of all posts and Stephen and Petros (about 25% of all posts between them) providing a lot more input, possibly more politely at times. It's like seeing a carpenter building a stud wall with obvious flaws, but when you suggest he might need a double header over that doorway, he instead focuses on a corner post or footer.
     
  6. Stephen Ditmore
    Joined: Jun 2001
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    Stephen Ditmore Senior Member

    Nothin' like a few good picks of a hull that works ...
     

    Attached Files:


  7. Petros
    Joined: Oct 2007
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    Petros Senior Member

    perhaps as suggested by Stephen, go find some hull designs in the size you are considering, that have proven track records as good sailors, and study their hull shapes. Than try and understand why they are designed the way they are, if you can go out and sail on them (borrow or rent, find a local club and make some new friends).

    Than work on one aspect of the design at a time: hull, than keel/rudder, than sailing configuration, etc.

    Once you have a good undertanding of why hulls and rigging are designed the way they are, than you will have a better foundation for making modifications or a new design to suite your particular desires in a small boat.

    Any sufficiently water tight hull will float, and hang anything in the wind and it will blow you down wind. But to make it behave in predicable ways and have reasonable performance, you need to start with understanding existing designs of successful boats.
     
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