Multihulls

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

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  1. peteyak

    Rudder mount design for small outrigger

    peteyak, Jan 11, 2022
    Replies:
    13
    Views:
    5,476
    revintage
    Jan 19, 2022
  2. Lachie

    Life is too short to fair above the waterline

    Lachie, Mar 19, 2021 ... 2 3 4
    Replies:
    49
    Views:
    15,290
    rael dobkins
    Jan 14, 2022
  3. PeculiarBob

    Mike Waller yacht design opinions?

    PeculiarBob, Dec 16, 2021 ... 2
    Replies:
    21
    Views:
    9,817
    jamez
    Jan 11, 2022
  4. Paul Scott

    Frankenboat questions

    Paul Scott, Jan 3, 2022
    Replies:
    0
    Views:
    4,797
    Paul Scott
    Jan 3, 2022
  5. sun

    Is there an estimation formula for calculating wave force of different marine structures？

    sun, Dec 27, 2021
    Replies:
    11
    Views:
    5,607
    jehardiman
    Jan 3, 2022
  6. Manfred.pech

    ...to smash all records

    Manfred.pech, Jan 1, 2022
    Replies:
    9
    Views:
    5,130
    jehardiman
    Jan 1, 2022
  7. guzzis3

    Sydney to Hobart multihulls

    guzzis3, Dec 27, 2021 ... 2
    Replies:
    18
    Views:
    7,790
    redreuben
    Jan 1, 2022
  8. Kuter

    Tri with central hull smaller than side hulls

    Kuter, Dec 23, 2021
    Replies:
    8
    Views:
    6,028
    rxcomposite
    Dec 24, 2021
  9. redreuben

    Vale James Wharram

    redreuben, Dec 18, 2021
    Replies:
    3
    Views:
    5,739
    jamez
    Dec 18, 2021
  10. Roni

    Resistance prediction methods/series for catamarans

    Roni, Jul 8, 2020 ... 2
    Replies:
    20
    Views:
    10,210
    Ad Hoc
    Dec 12, 2021
  11. DamianW86

    looking for spreaders reynolds 33 spar

    DamianW86, Dec 8, 2021
    Replies:
    1
    Views:
    5,264
    SolGato
    Dec 9, 2021
  12. rael dobkins

    ROUGH sea PROA Cruising, SHUNTING is the FUTURE... Balkan Shipyards

    rael dobkins, Nov 24, 2021
    Replies:
    8
    Views:
    6,958
    rael dobkins
    Dec 8, 2021
  13. ChrisVJ

    Pre bent masts

    ChrisVJ, Nov 29, 2021
    Replies:
    13
    Views:
    6,377
    Blueknarr
    Dec 6, 2021
  14. Manfred.pech

    French Trimaran

    Manfred.pech, Nov 25, 2021
    Replies:
    5
    Views:
    6,376
    redreuben
    Nov 26, 2021
  15. Dolfiman

    Ultims are back in 2021

    Dolfiman, May 7, 2021 ... 2
    Replies:
    26
    Views:
    12,026
    Dolfiman
    Nov 24, 2021
  16. jmoropeza

    Newbie asking for advice

    jmoropeza, Oct 17, 2021 ... 2 3 4
    Replies:
    53
    Views:
    15,874
    jmoropeza
    Nov 7, 2021
  17. rturbett

    Breathability

    rturbett, Oct 13, 2021
    Replies:
    13
    Views:
    34,559
    rturbett
    Nov 1, 2021
  18. guzzis3

    L shaped centerboards

    guzzis3, Oct 24, 2021
    Replies:
    7
    Views:
    6,145
    upchurchmr
    Oct 26, 2021
  19. guzzis3

    4hp outboard

    guzzis3, Apr 25, 2021 ... 2
    Replies:
    25
    Views:
    10,602
    trip the light fandango
    Oct 26, 2021
  20. Stumble

    Design thoughts?

    Stumble, Oct 19, 2021 ... 2
    Replies:
    20
    Views:
    12,523
    rob denney
    Oct 23, 2021
  21. guzzis3

    Crowther spindrift 48

    guzzis3, Oct 1, 2021 ... 2
    Replies:
    16
    Views:
    10,484
    upchurchmr
    Oct 12, 2021
  22. flagg

    Bob Oram website - something looks awfully wrong here??

    flagg, Oct 9, 2021
    Replies:
    1
    Views:
    10,501
    Mr Efficiency
    Oct 9, 2021
  23. rturbett

    Catamaran beam construction

    rturbett, Jul 11, 2021 ... 2
    Replies:
    21
    Views:
    10,740
    rturbett
    Oct 1, 2021
  24. rael dobkins

    Preparing for sea, Proa physics and a new rudder. Balkan Shipyards

    rael dobkins, Sep 30, 2021
    Replies:
    0
    Views:
    6,871
    rael dobkins
    Sep 30, 2021
  25. Hell_Bent

    In Search of Epicure (design commentary is also welcome)

    Hell_Bent, Sep 22, 2021
    Replies:
    7
    Views:
    7,136
    Hell_Bent
    Sep 29, 2021
  26. Amphicat

    Help me design the AmphiCat

    Amphicat, Sep 16, 2021 ... 2 3
    Replies:
    37
    Views:
    9,295
    Amphicat
    Sep 20, 2021
  27. Robert A Walker

    Tri, Tri, Tri

    Robert A Walker, Sep 14, 2021
    Replies:
    2
    Views:
    6,077
    catsketcher
    Sep 14, 2021
  28. jtrosclair

    12 foot trimaran, can someone tell me if this center hull looks about right?

    jtrosclair, Sep 9, 2021
    Replies:
    9
    Views:
    6,332
    guzzis3
    Sep 10, 2021
  29. guzzis3

    Glider/L'il Nip weight

    guzzis3, Aug 30, 2021
    Replies:
    10
    Views:
    5,320
    guzzis3
    Sep 9, 2021
  30. CardboardKing

    Hobie Cat Lateen Conversion

    CardboardKing, Sep 2, 2021
    Replies:
    11
    Views:
    6,666
    CardboardKing
    Sep 8, 2021
  31. rael dobkins

    The next PROA from Balkan Shipyards, the LOGIC behind the DESIGN.

    rael dobkins, Aug 28, 2021
    Replies:
    1
    Views:
    5,218
    redreuben
    Aug 31, 2021
  32. nezih ahmet

    Ply Catamaran

    nezih ahmet, Mar 24, 2010
    Replies:
    9
    Views:
    10,148
    guzzis3
    Aug 25, 2021
  33. terhohalme

    How to dimension a sailing catamaran?

    terhohalme, Apr 27, 2008 ... 4 5 6
    Replies:
    83
    Views:
    54,450
    Andre Holanda
    Aug 18, 2021
  34. bruceb

    Modern sheet material designs

    bruceb, Aug 6, 2021 ... 2
    Replies:
    28
    Views:
    7,036
    bruceb
    Aug 12, 2021
  35. Iridian

    Cruising Catamaran Righting System

    Iridian, Aug 3, 2021
    Replies:
    4
    Views:
    4,965
    redreuben
    Aug 5, 2021
  36. Scuff

    Self tacking jib options

    Scuff, Jul 13, 2021 ... 2
    Replies:
    17
    Views:
    6,576
    Blueknarr
    Jul 31, 2021
  37. Burnside Style

    Beach Catamaran Beams from Aluminum to ply/composite?

    Burnside Style, Jul 16, 2021 ... 2 3
    Replies:
    44
    Views:
    8,613
    rxcomposite
    Jul 27, 2021
  38. jmarker1612

    Martingale Design

    jmarker1612, Jul 23, 2021
    Replies:
    3
    Views:
    4,059
    bajansailor
    Jul 24, 2021
  39. DennisRB

    Catamaran tender to replace rib?

    DennisRB, Jul 4, 2014 ... 3 4 5
    Replies:
    74
    Views:
    44,329
    EDWARD GARCIA
    Jul 21, 2021
  40. Moshe Chocron

    Recently purchased our first boat - 1984 45' Catamaran

    Moshe Chocron, Jul 17, 2021
    Replies:
    11
    Views:
    3,083
    fallguy
    Jul 17, 2021
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