Star class performance graph

Discussion in 'Sailboats' started by yoyo, Nov 23, 2005.

  1. yoyo
    Joined: Nov 2005
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    yoyo New Member

    Hello all,

    I'm working on modelisation of a Star class boat in order to import and play it in Virtual Skipper 4 game.

    But i don't know the performances of this boat. So, i'm looking for the polar performance graphs but it's hard to find because these boats have generally no speedometer.

    Can somebody help me to find this ?

    Thanks in advance
     
  2. the_sphincter
    Joined: Nov 2005
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    the_sphincter *

    What you're looking for is a "polar diagram". Maybe someone at the star class website on the message boards might have one
     
  3. yoyo
    Joined: Nov 2005
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    yoyo New Member

    Thank you sphincter,

    i have already tried to go on the starclass association forum but it seems to have a problem, i'm unable to register... and the last message is from oct. 1st :confused:
     
  4. the_sphincter
    Joined: Nov 2005
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    the_sphincter *

    you mentioned that they're hard to find because they have no speedometer. I believe most polars are made using a velocity prediction program, which wouldn't be around when it was first designed. You might want to check with builders (Folli, Mader, Lillia), or sailmakers.
     
  5. gwenolebernard
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    gwenolebernard Junior Designer

    Hello all,

    I'm currently working on a sailing video game using STAR boats. I'm struggling to find STAR sailing performance datas.
    I've already asked couple of people and it looks like it's not so easy to find a decent STAR polar graphs.
    If anyone of you can have any information regarding the STAR performances/targets or even sailing behaviour, I will be more than happy.
    Thanks a lot for your help.
     
  6. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    Star Performance Data

    Aside from contacting the builders as mentioned earlier, you might consider contacting Paul Cayard ,a great Star sailor and damn nice guy:
    1) Media liaison: jennifer@cayardsailing.com
    2) General Enquiries: mail@cayardsailing.com
    I got this from his website which hasn't been updated in a long time, so they may not work. Good Luck!

    And there's this: https://twitter.com/CayardSailing
     
  7. gwenolebernard
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    gwenolebernard Junior Designer

    Hi Doug,

    Thanks for your help. I've already asked couple of sailors without success. I will try anyway!

    Merci
     
  8. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    You won't find a reliable polar diagram of a Star, I am afraid.
    The performance of small dinghies depends greatly on things which are related to sailor's experience and mode of sailing. Crew body weight shifted a little bit forward or backwards can make a difference, as well as rig tuning for a particular weather conditions or racing course.
    Polar diagrams, if you want to get some meaningful data out of them, are something that belongs to the realm of bigger and heavier sailboats. :)
    Cheers
     
  9. gwenolebernard
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    gwenolebernard Junior Designer

    Yes I agree. Unfortunately I know and understand that it's not easy to get accurate details specially because there are some many factors to take into account as you're saying.
    What I'm targeting is the boat main way to sail and main sailing targets. I just want to get as close I can on this boat sailing principles.
     
  10. Mikko Brummer
    Joined: May 2006
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    Mikko Brummer Senior Member

    Hello Gwénolé,

    Yes, I think I can help you. We don't have systematic measured data on the Star, only some "spots", but I have done theoretical polars. Basically, there's no reason one could not measure Star & dinghies polars, there are black boxes available for exactly that purpose, but we have not done it for the Star. I know the British did it for every Olympic class before London, they hired one person for that.

    I will send you something through your personal mail.
     

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  11. gwenolebernard
    Joined: Mar 2012
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    Location: Lorient

    gwenolebernard Junior Designer

    Hello Mikko,

    Thanks for your help. I'm looking forward to have a look into what you have done.
    Merci,


    _/)
    ~~~~_/)~~~~~~~~~~~~~~~~~~_/)~~~~~
    Gwénolé BERNARD
     

  12. Baltic Bandit

    Baltic Bandit Previous Member

    There are a couple of factors here
    • There is no one "star boat" - there are different keels, different keel positions, different masts, different hull shapes (Bill Buchan supposedly had an intentionally assymetrical hull for the Seul Olympics) etc. and ALL of these differences add up to radically different speed boats
    • Lots of money has been put into the design of the more modern boats. Heck I even know one guy that hired one of the best keel designers out there (has done AC cup work) just to run some FEA analysis on how to reshape his keel and where to place his jib leads. So folk are not happy to part with information for free that cost them a couple of months of hard work
    • As stated, crew technique is huge - absolutely huge in these boats. As crew, I literally steer the boat from the bow going downwind. And if I do it right, we are 1% faster, and if I do it wrong we are 3% slower.
    • The boats are light enough that all sorts of small condition changes matter (like wind skewed 15 degrees to the waves, or against an ebbing current) - things that on larger boats don't matter as much
     
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