Hydrodynamics and Aerodynamics

Technical discussion on fluid dynamics: theory and analysis.

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  1. Grunf

    Windsurf raked sail

    Grunf, Nov 22, 2020 ... 2 3
    Replies:
    31
    Views:
    5,847
    Steve Clark
    Dec 30, 2020
  2. Dave_S

    Help with design of T rudders for a 50' catamaran

    Dave_S, Nov 24, 2020
    Replies:
    4
    Views:
    1,589
    Dave_S
    Jan 2, 2021
  3. Slingshot

    hard wing vs soft wing?

    Slingshot, Apr 11, 2020 ... 2 3 4
    Replies:
    58
    Views:
    9,287
    Will Gilmore
    Jan 3, 2021
  4. S V

    Slender non-planing foil assist catamaran?

    S V, Dec 28, 2020 ... 5 6 7
    Replies:
    95
    Views:
    9,268
    S V
    Jan 7, 2021
  5. stepcut

    Asymmetric Leeboard Design?

    stepcut, Dec 23, 2020
    Replies:
    14
    Views:
    3,644
    tspeer
    Jan 22, 2021
  6. revintage

    Keiper's Williwaw bow foils

    revintage, Dec 2, 2020
    Replies:
    9
    Views:
    2,146
    revintage
    Jan 25, 2021
  7. dustman

    Wave interference in catamarans

    dustman, Dec 1, 2020
    Replies:
    10
    Views:
    3,012
    Mr Efficiency
    Jan 26, 2021
  8. 14berlin

    Basic Foil Design (I14 T-Foil)

    14berlin, Jan 23, 2021
    Replies:
    4
    Views:
    3,496
    14berlin
    Jan 28, 2021
  9. Christian Lucas

    comparison foil vis surface gliding ski at best angle of attack

    Christian Lucas, Jan 30, 2021
    Replies:
    1
    Views:
    1,257
    Erwan
    Jan 30, 2021
  10. 23feet

    Waterline length includes the rudder? Displacement speed.

    23feet, Oct 19, 2020
    Replies:
    3
    Views:
    2,506
    fredrosse
    Feb 4, 2021
  11. RogerO

    Fenced V foil sail inflatable planB

    RogerO, Feb 2, 2021
    Replies:
    2
    Views:
    1,357
    RogerO
    Feb 9, 2021
  12. jehardiman

    There is no "lift"!

    jehardiman, Jul 25, 2013 ... 2
    Replies:
    22
    Views:
    5,987
    Sailor Al
    Feb 10, 2021
  13. mfly

    Developed New Type of Soft Wing Sail: Wing'soul

    mfly, Feb 9, 2021
    Replies:
    2
    Views:
    2,092
    ImaginaryNumber
    Feb 13, 2021
  14. RogerO

    Fenced surface piercing V foil sail inflatable.

    RogerO, Jan 27, 2021 ... 2
    Replies:
    18
    Views:
    2,630
    RogerO
    Feb 15, 2021
  15. Eytan Levi

    L= 4.06 X V^2 X S X CL Hydrofoil

    Eytan Levi, Feb 18, 2021
    Replies:
    0
    Views:
    1,718
    Eytan Levi
    Feb 18, 2021
  16. Sailor Al

    A sail is not a wing

    Sailor Al, Feb 7, 2021 ... 11 12 13
    Replies:
    183
    Views:
    14,257
    Howlandwoodworks
    Feb 26, 2021
  17. Remmlinger

    Aerodynamic Characteristics of 2D Sail sections

    Remmlinger, Feb 16, 2021 ... 2
    Replies:
    15
    Views:
    2,848
    gonzo
    Mar 4, 2021
  18. Glueandcoffee

    Rc sailrocket

    Glueandcoffee, Feb 9, 2021 ... 2 3 4
    Replies:
    51
    Views:
    6,485
    Glueandcoffee
    Mar 28, 2021
  19. BlueBell

    Viva Turbulent Flow, AC75's Pay Attention

    BlueBell, Mar 25, 2021
    Replies:
    4
    Views:
    1,458
    Sailor Al
    Apr 2, 2021
  20. useless33

    Lateral Hunting/Wandering on plane

    useless33, Mar 27, 2021 ... 2
    Replies:
    28
    Views:
    2,282
    Mr Efficiency
    Apr 5, 2021
  21. SlickMick

    Seeking to Learn

    SlickMick, Apr 3, 2021
    Replies:
    7
    Views:
    1,298
    TANSL
    Apr 7, 2021
  22. Bjorn Moren

    Tool that calculates total drag for a submarine

    Bjorn Moren, Apr 11, 2021 ... 2
    Replies:
    16
    Views:
    3,496
    upchurchmr
    Apr 15, 2021
  23. Inquisitor

    Drag Coefficient versus Size

    Inquisitor, Sep 15, 2020 ... 2
    Replies:
    17
    Views:
    3,599
    Will Gilmore
    Apr 20, 2021
  24. farjoe

    Wind Shadow of AC36 Boats

    farjoe, Mar 13, 2021
    Replies:
    12
    Views:
    2,573
    Mikko Brummer
    Apr 22, 2021
  25. Claudio Valerio Parboni

    Sailing yacht - Estimating ballast bulb added resistance?

    Claudio Valerio Parboni, Apr 28, 2021
    Replies:
    3
    Views:
    1,398
    Dolfiman
    Apr 29, 2021
  26. Greg Dunn

    Flat keel - what to do?

    Greg Dunn, Apr 3, 2021 ... 2
    Replies:
    19
    Views:
    3,227
    CT249
    Apr 29, 2021
  27. ursus

    Drag characteristics of RIB

    ursus, Apr 28, 2021 ... 2
    Replies:
    17
    Views:
    3,365
    rxcomposite
    May 2, 2021
  28. Sailor Al

    Vortices as source of aerodynamic force?

    Sailor Al, Mar 26, 2021 ... 4 5 6
    Replies:
    80
    Views:
    9,027
    Sailor Al
    May 6, 2021
  29. Charles Reaves

    Heeling at speed

    Charles Reaves, May 8, 2021
    Replies:
    11
    Views:
    1,512
    Mr Efficiency
    May 9, 2021
  30. Luke Frisbee

    DIY axial flow pump, fractional hp motor, highest level of water through 6 inch diameter 30 ft pipe

    Luke Frisbee, May 5, 2021 ... 2
    Replies:
    26
    Views:
    3,752
    Dejay
    May 11, 2021
  31. massandspace

    Trimaran centerboard advice wanted

    massandspace, May 7, 2021
    Replies:
    4
    Views:
    1,150
    Steve Clark
    May 12, 2021
  32. nzl51

    A question of planform - Replacement Trimaran Centreboard

    nzl51, Apr 30, 2021
    Replies:
    5
    Views:
    1,899
    Steve Clark
    May 12, 2021
  33. Coastal Ogre

    New Antifouling Bottom? (by Gunboat/GLY this time...)

    Coastal Ogre, May 12, 2021
    Replies:
    4
    Views:
    1,217
    The Q
    May 14, 2021
  34. PHQ

    Added Resistance in Wave

    PHQ, Jun 30, 2013
    Replies:
    12
    Views:
    4,095
    Pablo Sopelana
    May 17, 2021
  35. vicbauwens

    ORC added resistance

    vicbauwens, Oct 11, 2014
    Replies:
    12
    Views:
    4,083
    Pablo Sopelana
    May 17, 2021
  36. tlouth7

    Scaling laws and foiling

    tlouth7, May 14, 2021 ... 2
    Replies:
    16
    Views:
    3,533
    Skyak
    May 26, 2021
  37. Mikko Brummer

    About the induced drag of sails

    Mikko Brummer, May 18, 2020 ... 4 5 6
    Replies:
    81
    Views:
    15,638
    Pablo Sopelana
    Jun 3, 2021
  38. dustman

    Efficiency: Hull interference vs length on catamarans

    dustman, Jun 3, 2021 ... 3 4 5
    Replies:
    70
    Views:
    8,499
    rxcomposite
    Jun 4, 2021
  39. dustman

    Efficiency: Submerged transoms

    dustman, Jun 3, 2021 ... 2 3
    Replies:
    31
    Views:
    4,359
    Mr Efficiency
    Jun 5, 2021
  40. rafa_racer

    How big should my foils be?

    rafa_racer, Jun 8, 2021
    Replies:
    0
    Views:
    1,352
    rafa_racer
    Jun 8, 2021
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