Multihulls

Discuss multi-hull sailboat design, production and custom sailing catamarans and trimarans.

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  1. rael dobkins

    Proa Rudders, Fold up, Kick Up, Balkan Style...

    rael dobkins, Aug 14, 2023
    Replies:
    0
    Views:
    1,366
    rael dobkins
    Aug 14, 2023
  2. revintage

    Old Tornado class rules

    revintage, Aug 11, 2023
    Replies:
    3
    Views:
    1,307
    revintage
    Aug 12, 2023
  3. Sippe

    Are old catamarans designs still a viable option today?

    Sippe, Jun 21, 2009
    Replies:
    11
    Views:
    9,182
    revintage
    Aug 11, 2023
  4. robert shuman

    What kind of Cat is this?

    robert shuman, Aug 6, 2023
    Replies:
    9
    Views:
    2,136
    robert shuman
    Aug 10, 2023
  5. Tiny Turnip

    Unstayed mast build for small canoe based trimaran.

    Tiny Turnip, Aug 5, 2023 ... 2
    Replies:
    17
    Views:
    3,859
    Tiny Turnip
    Aug 10, 2023
  6. seandepagnier

    daggerboards rake angle

    seandepagnier, Aug 2, 2023
    Replies:
    0
    Views:
    1,467
    seandepagnier
    Aug 2, 2023
  7. Corley

    Kurt Hughes paper on wingmast design focusing on wood/epoxy masts

    Corley, Jan 16, 2017
    Replies:
    11
    Views:
    6,309
    MichaelRoberts
    Jul 31, 2023
  8. bolero105

    Cutting portlights into topsides

    bolero105, Jun 9, 2023
    Replies:
    13
    Views:
    3,057
    fallguy
    Jul 20, 2023
  9. Rob T

    I think I made a mistake (building a vinta)

    Rob T, Jul 17, 2023
    Replies:
    6
    Views:
    2,081
    Rob T
    Jul 17, 2023
  10. revintage

    Dual pair shrouds on trimaran

    revintage, Jul 7, 2023
    Replies:
    6
    Views:
    2,153
    revintage
    Jul 11, 2023
  11. Skip Johnson

    Proa Registration

    Skip Johnson, Jul 1, 2023
    Replies:
    3
    Views:
    1,827
    fallguy
    Jul 3, 2023
  12. cando2

    a multihull design riddle

    cando2, Jun 11, 2023 ... 2 3
    Replies:
    35
    Views:
    6,833
    cavalier mk2
    Jul 1, 2023
  13. zigzag

    Bernie Rodriguez LC 32

    zigzag, Mar 7, 2009
    Replies:
    5
    Views:
    3,966
    rfin
    Jun 25, 2023
  14. seandepagnier

    storm sail on older trimarans

    seandepagnier, Jun 5, 2023
    Replies:
    1
    Views:
    1,582
    cavalier mk2
    Jun 6, 2023
  15. Forecaddie

    stabiliser Ama for small power tri

    Forecaddie, Jun 2, 2023
    Replies:
    1
    Views:
    1,522
    SolGato
    Jun 2, 2023
  16. pioneer_11

    Books for a physicist to learn sailboat design (preference for mutihulls)

    pioneer_11, Mar 10, 2023 ... 2
    Replies:
    17
    Views:
    4,611
    pioneer_11
    May 29, 2023
  17. AdrianN

    Difference concept of cruising catamarans

    AdrianN, Apr 10, 2023 ... 2 3
    Replies:
    34
    Views:
    6,715
    guzzis3
    May 10, 2023
  18. tz3dcom

    38m trimaran animation

    tz3dcom, May 4, 2023
    Replies:
    1
    Views:
    1,497
    bajansailor
    May 5, 2023
  19. Paul Scott

    Rudder lift on Boardless Catamarans?

    Paul Scott, Apr 12, 2023
    Replies:
    2
    Views:
    1,776
    patzefran
    Apr 28, 2023
  20. Sylvain Savoie

    Trimaran scow bow

    Sylvain Savoie, Apr 3, 2023
    Replies:
    8
    Views:
    3,180
    waterbear
    Apr 25, 2023
  21. Philip

    Wing Sail Doubles as an Outrigger?

    Philip, Apr 24, 2023
    Replies:
    4
    Views:
    1,820
    myszek
    Apr 24, 2023
  22. MichaelRoberts

    Rudder hydraulics

    MichaelRoberts, Apr 15, 2023
    Replies:
    8
    Views:
    1,959
    MichaelRoberts
    Apr 16, 2023
  23. trip the light fandango

    building new amas/floats from recycled beachcat hulls

    trip the light fandango, Apr 23, 2019 ... 7 8 9
    Replies:
    125
    Views:
    26,140
    trip the light fandango
    Apr 16, 2023
  24. MichaelRoberts

    Forces on transom rudder

    MichaelRoberts, Mar 13, 2023
    Replies:
    14
    Views:
    4,694
    MichaelRoberts
    Apr 15, 2023
  25. revintage

    Forestay bridle fitting

    revintage, Mar 29, 2023
    Replies:
    8
    Views:
    2,218
    revintage
    Apr 14, 2023
  26. pavel915

    Connecting the demi hulls

    pavel915, Mar 22, 2023 ... 2
    Replies:
    21
    Views:
    3,972
    oldmulti
    Mar 29, 2023
  27. Jeff in Boston

    Order of importance for hull efficiency

    Jeff in Boston, Sep 15, 2020
    Replies:
    12
    Views:
    3,809
    Capt. Peter Wilcox
    Mar 25, 2023
  28. waldemar de vries

    Fontaine Pajot Athena 38

    waldemar de vries, Mar 17, 2023
    Replies:
    2
    Views:
    1,557
    waldemar de vries
    Mar 23, 2023
  29. lane

    Trimaran amas using extruded polystyrene with epoxy

    lane, Mar 8, 2023 ... 2
    Replies:
    22
    Views:
    4,685
    lane
    Mar 23, 2023
  30. pavel915

    Wooden Catamaran Concept Design

    pavel915, Mar 21, 2023
    Replies:
    7
    Views:
    2,673
    pavel915
    Mar 21, 2023
  31. HydroNick

    Gougeon Wing Mast Plans

    HydroNick, Apr 4, 2010 ... 2 3
    Replies:
    39
    Views:
    32,134
    MichaelRoberts
    Mar 15, 2023
  32. SailorScience

    Who do you recommend for a major 900K USD build?

    SailorScience, Mar 13, 2023
    Replies:
    6
    Views:
    2,255
    bajansailor
    Mar 14, 2023
  33. lane

    Trimaran with Parallel Rig

    lane, Mar 12, 2023
    Replies:
    3
    Views:
    2,018
    lane
    Mar 13, 2023
  34. Bronwen Clark

    Lex Nicol designed catamaran mould

    Bronwen Clark, Mar 4, 2023
    Replies:
    5
    Views:
    2,005
    oldmulti
    Mar 6, 2023
  35. BananaMan777

    Best resources for learning boat design (Planing hulls)

    BananaMan777, Mar 4, 2023
    Replies:
    10
    Views:
    3,383
    bajansailor
    Mar 4, 2023
  36. Andrea Wasserliebend

    Ratio of lateral to sail area

    Andrea Wasserliebend, Mar 3, 2023
    Replies:
    5
    Views:
    1,933
    Skyak
    Mar 3, 2023
  37. SolGato

    Rotating Mast Control and Daggerboard Uphaul

    SolGato, Feb 12, 2023
    Replies:
    8
    Views:
    2,996
    SolGato
    Feb 20, 2023
  38. Andrea Wasserliebend

    Looking for a small coastal cruising catamaran

    Andrea Wasserliebend, Feb 17, 2023
    Replies:
    6
    Views:
    4,825
    fallguy
    Feb 18, 2023
  39. geoffkryten

    Catamaran math problem

    geoffkryten, Feb 17, 2023
    Replies:
    3
    Views:
    2,241
    bajansailor
    Feb 18, 2023
  40. lane

    Split Paddleboard for Amas

    lane, Sep 30, 2022 ... 2
    Replies:
    15
    Views:
    4,101
    BlueBell
    Feb 17, 2023
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