Hydrodynamics and Aerodynamics

Technical discussion on fluid dynamics: theory and analysis.

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  1. Guest

    sail aerodynamics

    Guest, Mar 21, 2002 ... 61 62 63
    Replies:
    943
    Views:
    374,275
    BobBill
    Sep 26, 2023
  2. Mikko Brummer

    Is circulation real?

    Mikko Brummer, Jan 25, 2013 ... 50 51 52
    Replies:
    765
    Views:
    102,144
    Sailor Al
    Jan 4, 2025
  3. Leo Lazauskas

    Definition of Planing

    Leo Lazauskas, Nov 2, 2012 ... 45 46 47
    Replies:
    696
    Views:
    121,281
    daiquiri
    Jun 18, 2013
  4. sandhammaren05
    Locked

    Froude and planing

    sandhammaren05, Feb 26, 2017 ... 26 27 28
    Replies:
    417
    Views:
    64,785
    Boat Design Net Moderator
    Apr 26, 2018
  5. Sailor Al

    Swept Volume Theory

    Sailor Al, Aug 2, 2022 ... 22 23 24
    Replies:
    349
    Views:
    47,186
    CarlosK2
    Jul 28, 2024
  6. laukejas

    Low-speed sailboat hull

    laukejas, Oct 12, 2014 ... 20 21 22
    Replies:
    322
    Views:
    56,542
    rwatson
    Jul 10, 2015
  7. Doug Lord

    Understanding Wing Technology

    Doug Lord, Sep 18, 2010 ... 20 21 22
    Replies:
    318
    Views:
    120,227
    brian eiland
    Apr 30, 2020
  8. Mr Efficiency

    Resistance factors, planing hull at low speed

    Mr Efficiency, Dec 6, 2010 ... 17 18 19
    Replies:
    281
    Views:
    81,934
    pilkinsur0
    Dec 5, 2019
  9. BobBill

    Jib question

    BobBill, Jun 9, 2012 ... 15 16 17
    Replies:
    252
    Views:
    43,187
    compositecox
    Oct 8, 2012
  10. Sailor Al

    Was Marchaj having us on?

    Sailor Al, Apr 12, 2021 ... 15 16 17
    Replies:
    246
    Views:
    35,588
    Sailor Al
    Aug 14, 2024
  11. dina

    boats that are designed with car aerodynamic method?

    dina, Oct 5, 2012 ... 15 16 17
    Replies:
    244
    Views:
    47,861
    Erwan
    Sep 10, 2023
  12. DCockey

    Hull Asymmetry and Minimum Wave Drag

    DCockey, May 28, 2011 ... 12 13 14
    Replies:
    209
    Views:
    53,061
    Leo Lazauskas
    Jan 9, 2013
  13. kidturbo

    Catamarans High Speed Blow Over - Causes & Solutions

    kidturbo, Sep 11, 2013 ... 11 12 13
    Replies:
    192
    Views:
    55,686
    BMcF
    Sep 7, 2014
  14. Sailor Al

    A sail is not a wing

    Sailor Al, Feb 7, 2021 ... 11 12 13
    Replies:
    183
    Views:
    20,822
    Howlandwoodworks
    Feb 26, 2021
  15. fredschmidt

    About inclined underwater hull form

    fredschmidt, Feb 18, 2012 ... 10 11 12
    Replies:
    173
    Views:
    58,611
    rowboat70
    Dec 14, 2013
  16. ToMy

    Semi-displacement boats don't generate lift?

    ToMy, Feb 28, 2023 ... 9 10 11
    Replies:
    163
    Views:
    24,431
    patzefran
    Feb 20, 2024
  17. Sailor Al

    What hold galaxies together?

    Sailor Al, Aug 3, 2022 ... 9 10 11
    Replies:
    161
    Views:
    18,196
    Paul Scott
    Mar 8, 2023
  18. MacktheYounger

    Foil for current-driven propulsion?

    MacktheYounger, Aug 30, 2022 ... 9 10 11
    Replies:
    155
    Views:
    15,011
    gonzo
    Nov 9, 2022
  19. Doug Halsey

    Foil Cavitation at Lower Speeds Than Expected

    Doug Halsey, Aug 11, 2015 ... 9 10 11
    Replies:
    154
    Views:
    28,438
    tspeer
    Oct 26, 2020
  20. DCockey

    The Myth of Aspect Ratio

    DCockey, Feb 20, 2011 ... 9 10 11
    Replies:
    153
    Views:
    55,226
    yipster
    Mar 26, 2011
  21. Will Fraser

    Deck sweeping sails and effective aspect ratio

    Will Fraser, Mar 31, 2015 ... 9 10 11
    Replies:
    150
    Views:
    41,783
    Will Fraser
    Sep 27, 2017
  22. gonzo

    Vibratory System

    gonzo, Jul 25, 2018 ... 7 8 9
    Replies:
    127
    Views:
    16,505
    MikeJohns
    Aug 13, 2018
  23. DogCavalry

    Buttocks

    DogCavalry, Sep 30, 2019 ... 7 8 9
    Replies:
    120
    Views:
    16,596
    DogCavalry
    Mar 9, 2024
  24. Solario

    Thrust greater than drag

    Solario, May 18, 2023 ... 6 7 8
    Replies:
    110
    Views:
    15,827
    Solario
    Jun 23, 2023
  25. quequen

    Hydrofoil exercise to validate CFD analysis

    quequen, Oct 1, 2014 ... 6 7 8
    Replies:
    106
    Views:
    48,952
    gigi
    Mar 23, 2017
  26. jesdreamer

    Transom Drag

    jesdreamer, Dec 14, 2015 ... 6 7 8
    Replies:
    105
    Views:
    28,309
    Leo Lazauskas
    Dec 22, 2015
  27. dustman

    What hull will be most efficient between 8-12 kts?

    dustman, Oct 9, 2021 ... 5 6 7
    Replies:
    99
    Views:
    14,954
    S V
    Nov 4, 2021
  28. S V

    Slender non-planing foil assist catamaran?

    S V, Dec 28, 2020 ... 5 6 7
    Replies:
    95
    Views:
    12,965
    S V
    Jan 7, 2021
  29. sailingdaniel

    Aspect ratio on headsail vs shroud angle?

    sailingdaniel, Aug 18, 2011 ... 5 6 7
    Replies:
    95
    Views:
    33,522
    brian eiland
    Nov 8, 2016
  30. Remmlinger

    Delft Hull Series

    Remmlinger, Aug 20, 2014 ... 5 6 7
    Replies:
    95
    Views:
    24,502
    Nick_D
    Feb 22, 2015
  31. Tad

    Planing Instability

    Tad, Sep 30, 2013 ... 5 6 7
    Replies:
    93
    Views:
    24,409
    HJS
    Apr 4, 2015
  32. markmal

    What is a significance of a wing thickness

    markmal, Nov 16, 2012 ... 5 6 7
    Replies:
    93
    Views:
    31,110
    P Flados
    Mar 8, 2013
  33. sandhammaren05

    Lift onset, planing, and lift coefficient

    sandhammaren05, Aug 13, 2018 ... 5 6 7
    Replies:
    92
    Views:
    15,798
    sandhammaren05
    Feb 21, 2019
  34. Doug Lord

    Sailing Foiler Design: Foil Assist and Full Flying

    Doug Lord, Dec 9, 2011 ... 5 6 7
    Replies:
    92
    Views:
    67,664
    Doug Lord
    Sep 13, 2018
  35. DCockey

    Canoe Sprints

    DCockey, Aug 10, 2012 ... 5 6 7
    Replies:
    90
    Views:
    21,107
    Leo Lazauskas
    Sep 6, 2012
  36. Robert Jansen

    Hull Speed

    Robert Jansen, Feb 23, 2012 ... 5 6 7
    Replies:
    90
    Views:
    20,192
    baeckmo
    Mar 1, 2012
  37. Roflhat

    Aerodynamics - thundercat racing inflatable

    Roflhat, Oct 13, 2015 ... 4 5 6
    Replies:
    89
    Views:
    39,300
    Anders
    Jun 9, 2020
  38. sabsfeigler

    Is Matte Faster?

    sabsfeigler, Aug 30, 2012 ... 4 5 6
    Replies:
    89
    Views:
    22,077
    Erwan
    Feb 24, 2013
  39. John Perry

    Two hulls, which has least drag?

    John Perry, Oct 26, 2012 ... 4 5 6
    Replies:
    89
    Views:
    30,537
    rxcomposite
    Feb 19, 2013
  40. Leo Lazauskas

    What does "engineering accuracy" mean to you?

    Leo Lazauskas, Feb 4, 2013 ... 4 5 6
    Replies:
    89
    Views:
    20,308
    jehardiman
    Feb 12, 2013
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