Hydrodynamics and Aerodynamics

Technical discussion on fluid dynamics: theory and analysis.

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  1. jmf11

    Crude simulation for free standing mast - sail - luff curve ?

    jmf11, Aug 6, 2021 ... 2 3
    Replies:
    31
    Views:
    4,938
    jmf11
    Aug 15, 2021
  2. S V

    Tandem hydrofoil assisted catamaran upwash/downwash calculation?

    S V, Aug 5, 2021
    Replies:
    0
    Views:
    1,908
    S V
    Aug 5, 2021
  3. Leo Ambtman

    Hull resistance

    Leo Ambtman, Aug 4, 2021 ... 2
    Replies:
    24
    Views:
    4,302
    TANSL
    Aug 9, 2021
  4. yootani

    Pontoon, one or two engines?

    yootani, Jul 24, 2021 ... 2
    Replies:
    22
    Views:
    2,771
    BlueBell
    Jul 28, 2021
  5. dustman

    Optimum sail draft for wind speed

    dustman, Jul 14, 2021 ... 2
    Replies:
    22
    Views:
    4,339
    rnlock
    Aug 4, 2022
  6. DogCavalry

    Sea Sled Performance: Qualitative Analysis

    DogCavalry, Jul 9, 2021 ... 2 3 4
    Replies:
    54
    Views:
    8,849
    fallguy
    Aug 2, 2022
  7. Jeff in Boston

    Flat stern bottom extention on displacement power boat?

    Jeff in Boston, Jul 9, 2021
    Replies:
    4
    Views:
    1,465
    Jeff in Boston
    Jul 11, 2021
  8. seandepagnier

    articulating rudder for sailboats

    seandepagnier, Jul 9, 2021 ... 2
    Replies:
    16
    Views:
    3,382
    Earl Boebert
    Jul 12, 2021
  9. DogCavalry

    Lift loss with increasing deadrise

    DogCavalry, Jul 8, 2021 ... 2
    Replies:
    20
    Views:
    3,169
    DogCavalry
    Jul 9, 2021
  10. DogCavalry

    Crouch Constant

    DogCavalry, Jul 6, 2021
    Replies:
    7
    Views:
    2,065
    BlueBell
    Jul 6, 2021
  11. Alexanov

    Hydrodynamic quality comparison.

    Alexanov, Jun 25, 2021
    Replies:
    8
    Views:
    1,807
    Erwan
    Jun 27, 2021
  12. ziper1221

    Why are longer diving fins more efficient?

    ziper1221, Jun 24, 2021
    Replies:
    14
    Views:
    3,580
    gonzo
    Aug 30, 2021
  13. Sailor Al

    Forces on sailboats (#3)

    Sailor Al, Jun 23, 2021 ... 2 3
    Replies:
    40
    Views:
    6,193
    rangebowdrie
    Sep 24, 2021
  14. Revboat

    Aerodynamics of 'overlapped' staysails

    Revboat, Jun 23, 2021 ... 2
    Replies:
    28
    Views:
    5,995
    brian eiland
    Oct 19, 2023
  15. Iridian

    Forward Swept Daggerboards?

    Iridian, Jun 22, 2021
    Replies:
    10
    Views:
    2,805
    Paul Scott
    May 2, 2023
  16. Bukmaster9

    Tunnel in Hull

    Bukmaster9, Jun 18, 2021 ... 2 3
    Replies:
    32
    Views:
    4,482
    Bukmaster9
    Jun 23, 2021
  17. fallguy

    Turbulence modeling

    fallguy, Jun 16, 2021
    Replies:
    4
    Views:
    1,232
    fallguy
    Jun 17, 2021
  18. Mikko Brummer

    Foiling boats weight sensitivity?

    Mikko Brummer, Jun 15, 2021 ... 2 3
    Replies:
    34
    Views:
    5,361
    FoilAddict
    Jun 23, 2021
  19. Claudio Valerio Parboni

    Twin Rudder lead and sizing?

    Claudio Valerio Parboni, Jun 8, 2021
    Replies:
    0
    Views:
    1,448
    Claudio Valerio Parboni
    Jun 8, 2021
  20. rafa_racer

    How big should my foils be?

    rafa_racer, Jun 8, 2021
    Replies:
    0
    Views:
    1,348
    rafa_racer
    Jun 8, 2021
  21. Pablo Sopelana

    Vortex lattice and panel methods

    Pablo Sopelana, Jun 4, 2021
    Replies:
    5
    Views:
    1,671
    Pablo Sopelana
    Jun 9, 2021
  22. dustman

    Efficiency: Submerged transoms

    dustman, Jun 3, 2021 ... 2 3
    Replies:
    31
    Views:
    4,342
    Mr Efficiency
    Jun 5, 2021
  23. dustman

    Efficiency: Hull interference vs length on catamarans

    dustman, Jun 3, 2021 ... 3 4 5
    Replies:
    70
    Views:
    8,458
    rxcomposite
    Jun 4, 2021
  24. tlouth7

    Scaling laws and foiling

    tlouth7, May 14, 2021 ... 2
    Replies:
    16
    Views:
    3,514
    Skyak
    May 26, 2021
  25. Coastal Ogre

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

    Coastal Ogre, May 12, 2021
    Replies:
    4
    Views:
    1,209
    The Q
    May 14, 2021
  26. Charles Reaves

    Heeling at speed

    Charles Reaves, May 8, 2021
    Replies:
    11
    Views:
    1,500
    Mr Efficiency
    May 9, 2021
  27. massandspace

    Trimaran centerboard advice wanted

    massandspace, May 7, 2021
    Replies:
    4
    Views:
    1,142
    Steve Clark
    May 12, 2021
  28. 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:
    3,723
    Dejay
    May 11, 2021
  29. nzl51

    A question of planform - Replacement Trimaran Centreboard

    nzl51, Apr 30, 2021
    Replies:
    5
    Views:
    1,889
    Steve Clark
    May 12, 2021
  30. ursus

    Drag characteristics of RIB

    ursus, Apr 28, 2021 ... 2
    Replies:
    17
    Views:
    3,348
    rxcomposite
    May 2, 2021
  31. Claudio Valerio Parboni

    Sailing yacht - Estimating ballast bulb added resistance?

    Claudio Valerio Parboni, Apr 28, 2021
    Replies:
    3
    Views:
    1,391
    Dolfiman
    Apr 29, 2021
  32. Sailor Al

    Was Marchaj having us on?

    Sailor Al, Apr 12, 2021 ... 14 15 16
    Replies:
    235
    Views:
    22,256
    gonzo
    Jan 5, 2023
  33. Bjorn Moren

    Tool that calculates total drag for a submarine

    Bjorn Moren, Apr 11, 2021 ... 2
    Replies:
    16
    Views:
    3,464
    upchurchmr
    Apr 15, 2021
  34. SlickMick

    Seeking to Learn

    SlickMick, Apr 3, 2021
    Replies:
    7
    Views:
    1,293
    TANSL
    Apr 7, 2021
  35. Greg Dunn

    Flat keel - what to do?

    Greg Dunn, Apr 3, 2021 ... 2
    Replies:
    19
    Views:
    3,208
    CT249
    Apr 29, 2021
  36. useless33

    Lateral Hunting/Wandering on plane

    useless33, Mar 27, 2021 ... 2
    Replies:
    28
    Views:
    2,266
    Mr Efficiency
    Apr 5, 2021
  37. Sailor Al

    Vortices as source of aerodynamic force?

    Sailor Al, Mar 26, 2021 ... 4 5 6
    Replies:
    80
    Views:
    8,986
    Sailor Al
    May 6, 2021
  38. BlueBell

    Viva Turbulent Flow, AC75's Pay Attention

    BlueBell, Mar 25, 2021
    Replies:
    4
    Views:
    1,449
    Sailor Al
    Apr 2, 2021
  39. chartman

    Modeling Boat Velocity During Acceleration & Deceleration

    chartman, Mar 16, 2021
    Replies:
    9
    Views:
    2,876
    Alan Cattelliot
    Nov 18, 2022
  40. LongCruise

    Active Drag Reduction?

    LongCruise, Mar 15, 2021 ... 2
    Replies:
    27
    Views:
    7,207
    BMcF
    Jan 28, 2022
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