rudder design

Discussion in 'Sailboats' started by josch, Nov 5, 2006.

  1. Brent Swain
    Joined: Mar 2002
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    Brent Swain Member

    Comparison with other similar boats will give you an idea of what works.
    Comparison is a good starting point in any aspect of yacht design.
     
  2. larry larisky

    larry larisky Previous Member

    since you never show the plans of the boats you pretend to have designed how do you know the first thing about yacht design since you are not a yacht designer (you own admission).
     
  3. ImaginaryNumber
    Joined: May 2009
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    ImaginaryNumber Imaginary Member

    Does anyone know if these articles are still available online anywhere for free?

    Also, does anyone know if this Westlawn student manual is available for purchase?

    http://www.westlawn.edu/news/index.asp?displayfile=SG2.htm
     
  4. Eric Sponberg
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    Location: On board Corroboree

    Eric Sponberg Senior Member

  5. Silver Raven
    Joined: Oct 2011
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    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    Gooday 'Tom' - Why ?? - "The deeper rudder will put more load on the head, etc etc". Surely if the 'rudder' is designed better in both section, foil shape & profile - - then why would the load on the head - not be much less. All this has been done before - back in the 60's & 70's in 'A', 'B' & 'C' class cats.

    Increased efficiency decreases load - top & bottom & makes for better balanced helm & faster boats. Yes/no??? Ciao, james
     
  6. philSweet
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    SR, check the date on that post by tspeer. The dust on it made me sneeze:p
     
  7. Silver Raven
    Joined: Oct 2011
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    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    Sorry 'phil' Please accept my appologies - - we're a long way behind the rest of the world - way down here. The subject is still relevent however - as it's being discussed in another part of these forums. Please recover from your 'hay-fever' soon & I hope you find enough tissues to last you out the planting & harvesting season. Ciao, james
     
  8. ImaginaryNumber
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    ImaginaryNumber Imaginary Member

    Thanks, Eric, for the Woodenboat Store link.
     
  9. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    What force component (or moment) do you intend when you say "load"?
     
  10. Silver Raven
    Joined: Oct 2011
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    Location: Far North Queensland, Australia

    Silver Raven Senior Member

    "force component/moment"

    'Daig' - Gooday - the force c/m we used was the formula we learned in 4th year @ 'HN University' in the applied quantum physics course we took & then applied & used sucessfully to win a few 'world chanpionships' in both 'A', 'B' & 'C' classes. Some of those figures were used directly in formulating the foil section, priofile & weight considerations when we built one of the many 'wing-masts' we built back in the late 60's - which were some 38' high x 14" thick x 60" -fore & aft - at the bottom & 28" x 4.5" at the top x 100lbs (45.359 kgs) x 128 sq ft, c/w all rigging & fittings. - A world leader of over 6 years.

    'Daig' - I don't understand your "do you intend when you say load". I do believe that whole statement was a question & should have had a '?' at the end. Yes/no???

    I couldn't help wondering if you were 'taking the micky out of me' as they say - here in Australia & New Zealand - where much of the 'cutting-edge' of the leading development in AC 45's, carbon wing-masts, etc etc is taking place, as well as building some of the finest yachts in the current world of racing.

    My confusion is probably due to the circumstances that I'm approaching - - ie. - when I get on-board my little toy - 45' x 1750 kgs x cruising tri & put a newer wing mast on it & then go cruising in & around SE Asia - I - like Gary - will try to send you some pictures.

    Sure hope that will do & in the meantime - y'all over there do have a grand day & remember to enjoy whatever sailing - that you get time to do. Ciao, james

    Oh & to all the rest of you - have a great day & GO sailing (same thing - eh?)
     
  11. rader
    Joined: Dec 2012
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    rader Junior Member

    Rudder design parameters

    The thread refers to Dave Gerr's articles in Professional Boat Builder. But the online archive does not go back as far as 2006. Does anyone know another source for the Gerr articles?

    Thanks.
     
  12. timothy22
    Joined: Feb 2008
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    Location: florida

    timothy22 Junior Member

    See Sponberg post #34 above



    Eric's link to the Woodenboatstore still shows all Proboatbuilder issues back to #1.
    Go to menu items digital downloads, then choose the magazine of choice.
     

  13. sean9c
    Joined: Jan 2011
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    sean9c Senior Member

    You'll find the same info and a lot more in Gerr's book.

     
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