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:
    339,043
    BobBill
    Sep 26, 2023
  2. Doug Lord

    Understanding Wing Technology

    Doug Lord, Sep 18, 2010 ... 20 21 22
    Replies:
    318
    Views:
    110,044
    brian eiland
    Apr 30, 2020
  3. Leo Lazauskas

    Definition of Planing

    Leo Lazauskas, Nov 2, 2012 ... 45 46 47
    Replies:
    696
    Views:
    101,849
    daiquiri
    Jun 18, 2013
  4. Mikko Brummer

    Is circulation real?

    Mikko Brummer, Jan 25, 2013 ... 49 50 51
    Replies:
    758
    Views:
    74,603
    Alan Cattelliot
    Feb 11, 2024
  5. Mr Efficiency

    Resistance factors, planing hull at low speed

    Mr Efficiency, Dec 6, 2010 ... 17 18 19
    Replies:
    281
    Views:
    72,475
    pilkinsur0
    Dec 5, 2019
  6. Doug Lord

    Sailing Foiler Design: Foil Assist and Full Flying

    Doug Lord, Dec 9, 2011 ... 5 6 7
    Replies:
    92
    Views:
    62,335
    Doug Lord
    Sep 13, 2018
  7. fredschmidt

    About inclined underwater hull form

    fredschmidt, Feb 18, 2012 ... 10 11 12
    Replies:
    173
    Views:
    52,887
    rowboat70
    Dec 14, 2013
  8. sandhammaren05
    Locked

    Froude and planing

    sandhammaren05, Feb 26, 2017 ... 26 27 28
    Replies:
    417
    Views:
    51,368
    Boat Design Net Moderator
    Apr 26, 2018
  9. Adam B

    Fast Stand Up Paddle board design?

    Adam B, Oct 9, 2012 ... 2
    Replies:
    18
    Views:
    51,240
    Adam B
    Nov 1, 2012
  10. laukejas

    Low-speed sailboat hull

    laukejas, Oct 12, 2014 ... 20 21 22
    Replies:
    322
    Views:
    48,858
    rwatson
    Jul 10, 2015
  11. DCockey

    The Myth of Aspect Ratio

    DCockey, Feb 20, 2011 ... 9 10 11
    Replies:
    153
    Views:
    48,539
    yipster
    Mar 26, 2011
  12. kidturbo

    Catamarans High Speed Blow Over - Causes & Solutions

    kidturbo, Sep 11, 2013 ... 11 12 13
    Replies:
    192
    Views:
    48,259
    BMcF
    Sep 7, 2014
  13. DCockey

    Hull Asymmetry and Minimum Wave Drag

    DCockey, May 28, 2011 ... 12 13 14
    Replies:
    209
    Views:
    46,116
    Leo Lazauskas
    Jan 9, 2013
  14. quequen

    Hydrofoil exercise to validate CFD analysis

    quequen, Oct 1, 2014 ... 6 7 8
    Replies:
    106
    Views:
    42,720
    gigi
    Mar 23, 2017
  15. dina

    boats that are designed with car aerodynamic method?

    dina, Oct 5, 2012 ... 15 16 17
    Replies:
    244
    Views:
    40,460
    Erwan
    Sep 10, 2023
  16. fimp

    Typical ship drag coefficients

    fimp, Dec 27, 2011
    Replies:
    2
    Views:
    38,847
    Ad Hoc
    Dec 27, 2011
  17. BobBill

    Jib question

    BobBill, Jun 9, 2012 ... 15 16 17
    Replies:
    252
    Views:
    36,719
    compositecox
    Oct 8, 2012
  18. Will Fraser

    Deck sweeping sails and effective aspect ratio

    Will Fraser, Mar 31, 2015 ... 9 10 11
    Replies:
    150
    Views:
    35,079
    Will Fraser
    Sep 27, 2017
  19. Roflhat

    Aerodynamics - thundercat racing inflatable

    Roflhat, Oct 13, 2015 ... 4 5 6
    Replies:
    89
    Views:
    33,681
    Anders
    Jun 9, 2020
  20. sailingdaniel

    Aspect ratio on headsail vs shroud angle?

    sailingdaniel, Aug 18, 2011 ... 5 6 7
    Replies:
    95
    Views:
    29,810
    brian eiland
    Nov 8, 2016
  21. Squidly-Diddly

    Can I make this table top fan QUIETER by modding the blades or something else?

    Squidly-Diddly, Aug 6, 2015 ... 2 3
    Replies:
    35
    Views:
    29,594
    upchurchmr
    Aug 24, 2015
  22. Sailor Al

    Swept Volume Theory

    Sailor Al, Aug 2, 2022 ... 21 22 23
    Replies:
    331
    Views:
    28,598
    C. Dog
    Apr 12, 2024
  23. Catatau

    How does the angle of the bow of a boat affects its coefficient of drag? PLEASE HELP

    Catatau, Nov 11, 2012 ... 2 3 4
    Replies:
    56
    Views:
    27,847
    tunnels
    Nov 13, 2012
  24. markmal

    What is a significance of a wing thickness

    markmal, Nov 16, 2012 ... 5 6 7
    Replies:
    93
    Views:
    27,503
    P Flados
    Mar 8, 2013
  25. Olav

    Maximum radius on spray rails

    Olav, Dec 12, 2011 ... 2 3
    Replies:
    43
    Views:
    27,108
    HakimKlunker
    Dec 18, 2011
  26. John Perry

    Two hulls, which has least drag?

    John Perry, Oct 26, 2012 ... 4 5 6
    Replies:
    89
    Views:
    26,738
    rxcomposite
    Feb 19, 2013
  27. lassjus

    Hydrofoil boat design.

    lassjus, Jan 21, 2013 ... 2
    Replies:
    22
    Views:
    24,752
    tspeer
    Jan 29, 2013
  28. Doug Lord

    Advantages/ Disadvantages of Curved Lifting Foils on Monohulls/Multihulls

    Doug Lord, Apr 6, 2011 ... 2 3
    Replies:
    43
    Views:
    23,932
    Doug Lord
    Oct 23, 2011
  29. jesdreamer

    Transom Drag

    jesdreamer, Dec 14, 2015 ... 6 7 8
    Replies:
    105
    Views:
    23,280
    Leo Lazauskas
    Dec 22, 2015
  30. Doug Halsey

    Foil Cavitation at Lower Speeds Than Expected

    Doug Halsey, Aug 11, 2015 ... 9 10 11
    Replies:
    154
    Views:
    22,934
    tspeer
    Oct 26, 2020
  31. pikac

    QL trim tabs or classic trim tabs??

    pikac, Jul 27, 2011
    Replies:
    4
    Views:
    22,676
    ABoatGuy
    Aug 2, 2011
  32. Sailor Al

    Was Marchaj having us on?

    Sailor Al, Apr 12, 2021 ... 14 15 16
    Replies:
    235
    Views:
    22,394
    gonzo
    Jan 5, 2023
  33. MantaRay

    Questioning airfoil design of WIG craft

    MantaRay, Mar 10, 2013 ... 2 3
    Replies:
    32
    Views:
    21,689
    DennisRB
    May 2, 2013
  34. oatsandbeans

    Sail camber

    oatsandbeans, Jan 31, 2013 ... 2 3 4
    Replies:
    50
    Views:
    21,466
    Erwan
    Mar 24, 2016
  35. Tad

    Planing Instability

    Tad, Sep 30, 2013 ... 5 6 7
    Replies:
    93
    Views:
    21,012
    HJS
    Apr 4, 2015
  36. jesdreamer

    Friction Coefficient

    jesdreamer, Sep 30, 2015 ... 4 5 6
    Replies:
    88
    Views:
    20,626
    jesdreamer
    Sep 6, 2016
  37. satrams

    Question about wingsail foil shape

    satrams, May 6, 2014 ... 3 4 5
    Replies:
    63
    Views:
    20,323
    Rurudyne
    Mar 12, 2015
  38. Remmlinger

    Delft Hull Series

    Remmlinger, Aug 20, 2014 ... 5 6 7
    Replies:
    95
    Views:
    20,249
    Nick_D
    Feb 22, 2015
  39. lunatic

    lift without downwash?

    lunatic, Oct 4, 2012 ... 3 4 5
    Replies:
    69
    Views:
    20,056
    markdrela
    Sep 28, 2017
  40. DCockey

    Delft Series Resistance Equations - Variety

    DCockey, Aug 4, 2011 ... 2 3 4
    Replies:
    49
    Views:
    19,636
    Mikko Brummer
    Mar 20, 2014
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