Polar Curve for VPP Calibration

Discussion in 'Boat Design' started by pierrot, May 21, 2014.

  1. pierrot
    Joined: Jul 2006
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: France

    pierrot Naval Architect & Enginee

    Hello sailors!

    I am a former naval architect, crisis made me go on other engineer fields since few years. But boat design nostalgia is still very present :)

    I still follow my favorite forum, and was thinking to build my own VPP code with Excel + VBA. My own VPP because it is the best exercise to go back on the physic of sailing: aero, hydro, and equilibrium.

    In order to validate it, I am in search for polar curves based on full scale experimental values. Not from ITTC, towing tank series, etc...

    I am looking those data for modern hull between 16 and 8 meters LOA like Class 40, Beneteau Figaro 2, Farr 30, etc...I mean boat that have capacities to reach good speed and planning downwind, and a minimum size and weight inertia not to be too much run by dynamic responses.

    I am looking for strong references, maybe from validated papers or boat racers, to calibrate the VPP. Polar chart are usefull only if the sail configurations are known too (sail plan if possible), ballast configurations, and as much as possible sea state. Body plans are welcome too, by default I thing I can manage to approach them if boats type are in my knowledge.

    Well, I know that it is a big request but isn't it the only way to get confident in our calculation?

    Thank you for your help!

  2. Alik
    Joined: Jul 2003
    Posts: 2,971
    Likes: 277, Points: 93, Legacy Rep: 1306
    Location: Thailand

    Alik Senior Member

  3. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 252, Points: 93, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

  4. pierrot
    Joined: Jul 2006
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: France

    pierrot Naval Architect & Enginee


    Hi Alik

    That's a very complete document, thank you very much, even if I unfortunatly don't read german. VPP charts are based on true scale mesurement, wich are quite precious datas!

    "Dyna" seems to be a "Delher 33 competition", hull and sail plan main lines can be found here:


    I found my request not such uncommon, check those two must read post on Dyna:

    one about VPP and Delft series from Dcockey : http://www.boatdesign.net/forums/hy...eries-resistance-equations-variety-39154.html

    And a nice post (about LPP from Uli by the way): http://www.boatdesign.net/forums/design-software/new-lines-prediction-program-45601.html

    Thanks for your references.

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.