Notable open & development class racers....

Discussion in 'Sailboats' started by Stephen Ditmore, Nov 20, 2006.

  1. RHough
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    RHough Retro Dude

    Moth's and 18's use movable ballast? That's news to me. Since when has crew weight been declared ballast? Are you saying that Rohan Veal is ballast? That might get you removed from his Xmas card list. :)

    Did someone say something about movable ballast in this thread? :confused:
     
  2. Doug Lord

    Doug Lord Guest

    Notable Development and Open Classes

    RHOUGH:"Did someone say something about movable ballast in this thread?" Why, yes-early on-it is one of the most notable technologies being used in many Open and Development Classes....
    +++++++++++

    Monohull development Speed and Speed/Length Ratio's:
    =========================
    ---12.75' Moth foiler-max speed (so far): 27.9 knots-uses movable ballast. Nom-S/L=8.41
    ---Aussie 18-max speed-(so far): 30 knots-uses movable ballast. S/L=7.07
    ---VOR70-max speed-(so far):40.6knots; 23.45 knots for 24 hours-uses movable ballast.S/L=4.85
    ---Alfa RomeoII(sistership to Wild Oats)-max speed-(so far):35 knots-uses movable ballast.S/L=3.62
    ---Open 60-max speed-so far-30 knots-uses movable ballast. S/L=3.87
    ------------------
     
  3. Doug Lord

    Doug Lord Guest

  4. Stephen Ditmore
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    Stephen Ditmore Senior Member

    Doug:
    I think there's an important difference between a sprint and an ocean passage. And I agree with RHough's implication that the latter is the real test of a boat's efficacy as a vehicle.
     
  5. CT 249
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    CT 249 Senior Member

    Movable ballast is also used on;

    MacGregor 26 powersailors

    Optimists

    International Dragons

    The 1880s designed New Haven Dinghy

    Catalina 22s

    And many other very slow boats (the Dragon isn't slow).

    In fact just about every racing boat uses movable ballast, so promoting movable ballast is a bit like promoting self-draining cockpits; yes the fast boats have them but so do many of the slow boats.

    And of course, there has always been a vast difference between human ballast and movable ballast.
     
  6. Vega
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    Vega Senior Member

    Of corse, with human ballast you have to pick 10 guys to go sailing. With movable ballast you can go alone and you just have to put water on the right tank:p
     
  7. CT 249
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    CT 249 Senior Member

    I don't have a massive problem with (non-powered) water ballast boats, Vega. But is IS possible to sail alone without 10 guys. Joshua Slocum, Eric Tabarly and Robin Knox-Johnston (most of the time), and the early BOC boats managed to sail singlehanded without water ballast.
     
  8. Vega
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    Vega Senior Member



    Well, it looks like the boat is also becoming popular in America.

    It was elected Boat of the year by the magazine "sailing World" in the category of Best One-Design.
     

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  9. Stephen Ditmore
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    Stephen Ditmore Senior Member

    But alas, the Open 5.7 is a one-design (i.e. monotype), not a development class racer (despite its name).

    Here is the current U.S. National Champion Classic Moth (left) next to a Classic Moth with rounder sections and less rocker. The national champ, "Mousetrap", is essencially the bow of the "Mistral" design with a stern very close to that of a Europe.
     

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  10. Stephen Ditmore
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    Stephen Ditmore Senior Member

    And here are some Classic Moth sailing photos.
     

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  11. Stephen Ditmore
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    Stephen Ditmore Senior Member

  12. Guillermo
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    Guillermo Ingeniero Naval

    Better use this one http://www.botincarkeek.com/home.html to avoid the long and outdated opening page.

    I find this new trend of web pages from designers quite unuseful. There have become only marketing tools full with nice images but almost no technical information.

    Cheers.
     
  13. Roly
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    Roly Senior Member

    Call me stupid, but please explain.I thought effective ballast, would be just that.
    At least when you lose human ballast and there is no other, the boat doesn't sail off without you.:D
     
  14. woudaboy
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    woudaboy Junior Member

    I'd be interested in speaking with you about some of the old dead and dying quarter tonners, if this is an appropriate forum.

    Art
     

  15. Stephen Ditmore
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    Stephen Ditmore Senior Member

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