Multihulls

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

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  1. David Swingler

    Design idea for a 15' cruising cat

    David Swingler, Oct 16, 2023
    Replies:
    13
    Views:
    2,200
    Will Gilmore
    Nov 28, 2023
  2. Bob McDowell

    Where did Uffa Fox sail Shearwater Catamaran 990?

    Bob McDowell, Nov 26, 2023
    Replies:
    3
    Views:
    940
    Bob McDowell
    Nov 28, 2023
  3. Tony Kopp

    A challenging design

    Tony Kopp, Aug 23, 2023 ... 3 4 5
    Replies:
    61
    Views:
    6,665
    Tony Kopp
    Nov 22, 2023
  4. Joseph Guthrie

    Outboard motor sled design

    Joseph Guthrie, Nov 14, 2023
    Replies:
    3
    Views:
    1,079
    Joseph Guthrie
    Nov 15, 2023
  5. seadreamer6

    twin masts on cat thoughts on

    seadreamer6, Oct 21, 2012 ... 2
    Replies:
    26
    Views:
    19,282
    brian eiland
    Nov 14, 2023
  6. Forecaddie

    Scaled model how to calculate weight

    Forecaddie, Oct 29, 2023
    Replies:
    10
    Views:
    1,534
    gonzo
    Nov 9, 2023
  7. Manfred.pech

    Wingmaran

    Manfred.pech, Nov 6, 2023
    Replies:
    2
    Views:
    856
    Manfred.pech
    Nov 8, 2023
  8. Doug Lord

    50/50 Biplane Cat

    Doug Lord, Jul 5, 2012
    Replies:
    5
    Views:
    9,690
    brian eiland
    Nov 6, 2023
  9. power boater

    Duet launch

    power boater, Nov 4, 2023
    Replies:
    14
    Views:
    1,020
    power boater
    Nov 5, 2023
  10. bjn

    Self righting multihull?

    bjn, Feb 27, 2018 ... 5 6 7
    Replies:
    94
    Views:
    16,369
    ALL AT SEA
    Nov 3, 2023
  11. Tyler DeWitt

    How to assess bulkhead strength of completed boat

    Tyler DeWitt, Oct 27, 2023
    Replies:
    7
    Views:
    1,132
    gonzo
    Oct 30, 2023
  12. waterbear

    Gougeonified Chat 18 knockabout

    waterbear, Oct 27, 2023
    Replies:
    6
    Views:
    967
    kapnD
    Oct 28, 2023
  13. Forecaddie

    10 meter proa sail rig options

    Forecaddie, Oct 18, 2023
    Replies:
    10
    Views:
    1,727
    ALL AT SEA
    Oct 27, 2023
  14. TwoBirds

    Dipping lug on a proa?

    TwoBirds, Jan 13, 2018
    Replies:
    13
    Views:
    4,023
    Paul Scott
    Oct 22, 2023
  15. SV Pororoca

    How a proa works / I'm making a 45ft one in Aluminum

    SV Pororoca, Jan 8, 2020 ... 2
    Replies:
    29
    Views:
    7,799
    Ad Hoc
    Oct 19, 2023
  16. mrlonely

    Catamaran Strength Analysis

    mrlonely, Oct 10, 2023
    Replies:
    6
    Views:
    1,330
    Ad Hoc
    Oct 12, 2023
  17. Coastal Ogre

    Multihull Bulkhead Refit Advice

    Coastal Ogre, Mar 1, 2021 ... 2 3
    Replies:
    34
    Views:
    6,665
    brian eiland
    Oct 10, 2023
  18. voodoo child

    Demountable, 30+ to 40+foot Cat design?

    voodoo child, Feb 3, 2023
    Replies:
    13
    Views:
    3,028
    Christo
    Oct 9, 2023
  19. Matt Wiseman

    Normon Cross Trimarans

    Matt Wiseman, Oct 7, 2023
    Replies:
    4
    Views:
    971
    Matt Wiseman
    Oct 7, 2023
  20. HydroNick

    Soft Rigging Solutions

    HydroNick, Aug 17, 2013 ... 2 3 4
    Replies:
    47
    Views:
    15,611
    BobBill
    Oct 7, 2023
  21. Holden

    Trimaran Build

    Holden, Oct 2, 2023
    Replies:
    7
    Views:
    1,338
    kapnD
    Oct 5, 2023
  22. member 76956

    HDPE Multihulls Indonesia

    member 76956, May 22, 2022
    Replies:
    2
    Views:
    3,504
    gonzo
    Oct 2, 2023
  23. pmudesign

    Outrigger canoe Ama design considerations

    pmudesign, Aug 22, 2023 ... 3 4 5
    Replies:
    63
    Views:
    6,427
    Paul Scott
    Oct 1, 2023
  24. Joseph Guthrie

    Designs of catamarans not in metric but SAE

    Joseph Guthrie, Aug 24, 2023 ... 2
    Replies:
    15
    Views:
    1,830
    DogCavalry
    Sep 30, 2023
  25. Sylvain Savoie

    Looking for a build plan for a tuff trailerable, weekender, beachable trimaran?

    Sylvain Savoie, Jul 31, 2023 ... 2
    Replies:
    23
    Views:
    3,129
    Steel Hull
    Sep 30, 2023
  26. TeeKay

    Any Seawind 24 owners on here?

    TeeKay, Sep 21, 2023
    Replies:
    8
    Views:
    1,250
    Corley_01
    Sep 28, 2023
  27. alan craig

    weymouth speed week 1973

    alan craig, Sep 24, 2023
    Replies:
    5
    Views:
    682
    alan craig
    Sep 26, 2023
  28. Pat Ross

    Daggerboads - Down/Up/Removed

    Pat Ross, Sep 8, 2023
    Replies:
    2
    Views:
    916
    TeeKay
    Sep 21, 2023
  29. willy13

    Gemini Catamaran, new builds?

    willy13, Sep 12, 2023
    Replies:
    3
    Views:
    1,158
    comfisherman
    Sep 13, 2023
  30. revintage

    Small trimaran with Tornado/Nacra 5.8 center hull

    revintage, Dec 25, 2021 ... 3 4 5
    Replies:
    60
    Views:
    16,579
    revintage
    Sep 9, 2023
  31. oldsailor7

    Buccaneer 24 Builders Forum

    oldsailor7, Jul 22, 2009 ... 193 194 195
    Replies:
    2,914
    Views:
    667,646
    bruceb
    Sep 8, 2023
  32. Jp de B

    Best free CAD for trimaran design

    Jp de B, Sep 8, 2023
    Replies:
    2
    Views:
    1,081
    Jp de B
    Sep 8, 2023
  33. AdrianN

    Why double purchase halyards?

    AdrianN, Aug 20, 2023
    Replies:
    13
    Views:
    1,638
    latestarter
    Sep 6, 2023
  34. Kurtz

    24ft Wa'apa / Hobie 16 mashup / shelter pod

    Kurtz, Aug 28, 2023
    Replies:
    9
    Views:
    1,423
    Kurtz
    Sep 1, 2023
  35. rael dobkins

    Time is Money.... They say, we disagree!

    rael dobkins, Aug 26, 2023
    Replies:
    2
    Views:
    750
    rael dobkins
    Aug 26, 2023
  36. Bigfork

    Mashup Trimaran (continued)

    Bigfork, Feb 17, 2021 ... 4 5 6
    Replies:
    76
    Views:
    16,756
    Air Tahiti
    Aug 26, 2023
  37. Gary Bernier

    1981 52' CSK ketch rigged catamaran

    Gary Bernier, Jul 1, 2021
    Replies:
    3
    Views:
    2,930
    LucasH992
    Aug 23, 2023
  38. rael dobkins

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

    rael dobkins, Aug 14, 2023
    Replies:
    0
    Views:
    634
    rael dobkins
    Aug 14, 2023
  39. revintage

    Old Tornado class rules

    revintage, Aug 11, 2023
    Replies:
    3
    Views:
    683
    revintage
    Aug 12, 2023
  40. Sippe

    Are old catamarans designs still a viable option today?

    Sippe, Jun 21, 2009
    Replies:
    11
    Views:
    7,906
    revintage
    Aug 11, 2023
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