Hydrodynamics and Aerodynamics

Technical discussion on fluid dynamics: theory and analysis.

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  1. CarlosK2

    Summary of the hydroDynamic Problem of small yachts at sea

    CarlosK2, May 17, 2026 at 5:00 AM
    Replies:
    7
    Views:
    73
    gonzo
    May 17, 2026 at 12:13 PM
  2. CarlosK2

    Simplified Froude-Krylov Force

    CarlosK2, May 11, 2026 ... 2 3
    Replies:
    33
    Views:
    644
    CarlosK2
    May 14, 2026 at 4:48 AM
  3. Alexanov

    OpenFOAM calculation mesh artefacts.

    Alexanov, Apr 24, 2026
    Replies:
    5
    Views:
    609
    Night Sky Yachts
    May 7, 2026
  4. CarlosK2

    The three causes of bow-down

    CarlosK2, May 3, 2026 ... 2
    Replies:
    21
    Views:
    494
    TANSL
    May 3, 2026
  5. mrdicksteel

    Sailboats, wide sterns and bow-down trim - what is too much

    mrdicksteel, Apr 13, 2026 ... 2 3
    Replies:
    30
    Views:
    1,491
    Jamie Kennedy 108
    May 2, 2026
  6. Mikko Brummer

    Is circulation real?

    Mikko Brummer, Jan 25, 2013 ... 51 52 53
    Replies:
    780
    Views:
    132,049
    CDBarry
    Apr 21, 2026
  7. CarlosK2

    Savitsky 1973

    CarlosK2, Mar 9, 2026
    Replies:
    12
    Views:
    958
    CarlosK2
    Apr 19, 2026
  8. JordanMay

    Creating lift in displacement hulls

    JordanMay, Apr 14, 2026 ... 2
    Replies:
    21
    Views:
    1,233
    rxcomposite
    Apr 18, 2026
  9. Gone Ballistic

    Overbalanced rudder with no balance area

    Gone Ballistic, Mar 10, 2026 ... 2
    Replies:
    24
    Views:
    1,964
    Gone Ballistic
    Apr 7, 2026
  10. Andrew Fournier

    JunkFoil

    Andrew Fournier, Mar 24, 2026 ... 2
    Replies:
    20
    Views:
    1,012
    Skip Johnson
    Apr 7, 2026
  11. Revboat

    Aerodynamics of 'overlapped' staysails

    Revboat, Jun 23, 2021 ... 2 3
    Replies:
    30
    Views:
    12,910
    brian eiland
    Apr 2, 2026
  12. Guest

    sail aerodynamics

    Guest, Mar 21, 2002 ... 64 65 66
    Replies:
    988
    Views:
    415,338
    gonzo
    Apr 1, 2026
  13. BlubBlub

    Why are sails tall instead of wide?

    BlubBlub, Jan 26, 2026 ... 2
    Replies:
    17
    Views:
    1,468
    Jamie Kennedy 108
    Mar 31, 2026
  14. Jamie Kennedy 108

    Lift/Drag/Stall of hull/keel/rudder combo

    Jamie Kennedy 108, Mar 26, 2026
    Replies:
    3
    Views:
    561
    Jamie Kennedy 108
    Mar 30, 2026
  15. Leo Lazauskas

    SWATH resistance predictions using Michlet

    Leo Lazauskas, Mar 13, 2012 ... 3 4 5
    Replies:
    70
    Views:
    24,730
    Ad Hoc
    Mar 20, 2026
  16. Daniel Reilly

    Tom Speer's proa foil sections: Any new data?

    Daniel Reilly, Mar 1, 2026
    Replies:
    3
    Views:
    738
    Daniel Reilly
    Mar 2, 2026
  17. CocoonCruisers

    Gyrocopter rotor instead of canvas sail ?

    CocoonCruisers, Mar 22, 2019 ... 4 5 6
    Replies:
    77
    Views:
    24,499
    Paul Scott
    Feb 15, 2026
  18. Luk

    Hull Resistance Prediction 14ft Sailing Dinghy

    Luk, Feb 11, 2026
    Replies:
    7
    Views:
    887
    Paul Scott
    Feb 15, 2026
  19. Tops

    Small Standing Lug Sail Design

    Tops, Jan 20, 2026
    Replies:
    12
    Views:
    1,088
    Tops
    Jan 25, 2026
  20. mc_rash

    Small displacement craft resistance

    mc_rash, Jun 11, 2024
    Replies:
    8
    Views:
    3,851
    wallabycreek
    Jan 22, 2026
  21. dustman

    Semi balanced wing sail pivot axis placement

    dustman, Dec 20, 2025
    Replies:
    5
    Views:
    963
    DogCavalry
    Jan 21, 2026
  22. Eurosnob

    Wagner Keel.

    Eurosnob, Dec 31, 2025
    Replies:
    9
    Views:
    2,008
    philSweet
    Jan 12, 2026
  23. Goranskoog
    Locked

    Emission-Free Wave-Powered Vessel Concept – All Comments Welcome

    Goranskoog, Dec 3, 2025 ... 4 5 6
    Replies:
    87
    Views:
    5,165
    Boat Design Net Moderator
    Jan 9, 2026
  24. aiprt

    Forces on mast foot

    aiprt, Nov 11, 2024 ... 2 3
    Replies:
    30
    Views:
    8,674
    rxcomposite
    Dec 13, 2025
  25. pmudesign

    Any benefit to rotating a non-wing / non-teardrop mast?

    pmudesign, Dec 5, 2018 ... 2
    Replies:
    16
    Views:
    5,442
    bruceb
    Dec 12, 2025
  26. Goranskoog

    Hydrodynamic Evaluation Request: Wave-Powered Cargo Vessel Using Internal Through-Channels

    Goranskoog, Dec 3, 2025
    Replies:
    1
    Views:
    796
    fallguy
    Dec 3, 2025
  27. GeneWeen

    Catamaran Hull Speeds

    GeneWeen, Nov 22, 2025
    Replies:
    6
    Views:
    1,211
    portacruise
    Nov 25, 2025
  28. New Vega

    Efficient and ocean-going?

    New Vega, Nov 15, 2025 ... 2
    Replies:
    27
    Views:
    2,370
    gonzo
    Nov 21, 2025
  29. laurencet

    Flap force simulation

    laurencet, Oct 25, 2025 ... 2
    Replies:
    23
    Views:
    3,317
    ziper1221
    Nov 19, 2025
  30. Maxence

    Propeller position for optimal water flow

    Maxence, Oct 2, 2025 ... 2 3
    Replies:
    30
    Views:
    2,850
    messabout
    Nov 12, 2025
  31. DunnX

    Additional Damping

    DunnX, Oct 16, 2025
    Replies:
    1
    Views:
    1,089
    jehardiman
    Oct 16, 2025
  32. DogCavalry

    Buttocks

    DogCavalry, Sep 30, 2019 ... 7 8 9
    Replies:
    121
    Views:
    21,046
    DogCavalry
    Oct 7, 2025
  33. DogCavalry

    A Research Program for Quantitative Wake Analysis

    DogCavalry, Sep 20, 2025 ... 2
    Replies:
    19
    Views:
    3,390
    BMcF
    Sep 26, 2025
  34. sanantonnio

    Space between mizzen mast and mainsail

    sanantonnio, Dec 7, 2017 ... 2 3 4
    Replies:
    49
    Views:
    13,840
    Paul Scott
    Sep 25, 2025
  35. Sgf

    Traditional rudder design query

    Sgf, Jul 12, 2025 ... 2 3
    Replies:
    34
    Views:
    5,230
    gonzo
    Sep 12, 2025
  36. seasquirt

    Reversing a balanced lug rig

    seasquirt, Jul 19, 2025
    Replies:
    10
    Views:
    3,712
    messabout
    Sep 6, 2025
  37. aL27jrcf

    [newbie]a rudder of a sailboat having entrance-exit holes?

    aL27jrcf, May 27, 2025
    Replies:
    14
    Views:
    2,668
    aL27jrcf
    Jul 21, 2025
  38. motorbike

    Keel Section

    motorbike, Feb 21, 2015 ... 2 3 4
    Replies:
    47
    Views:
    20,513
    Doug Halsey
    Jul 11, 2025
  39. javed

    Savitsky method result understanding confusion

    javed, Jun 17, 2025
    Replies:
    4
    Views:
    2,774
    Zachary Peter
    Jun 28, 2025
  40. Best Designer Ever

    Chine Location

    Best Designer Ever, Jun 12, 2025 ... 2
    Replies:
    16
    Views:
    3,370
    TANSL
    Jun 16, 2025
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