Powerboats

Discuss production and custom powerboats and powerboat design.

  1. Propulsion (link)

    Surface Drives, Jet Drives, Outboards, Sterndrives, Pod Drives, Inboards
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  1. kenfyoozed

    Searching for power cat plans

    kenfyoozed, Sep 15, 2020 ... 3 4 5
    Replies:
    68
    Views:
    12,147
    DogCavalry
    Oct 8, 2020
  2. leaky

    How Torque, HP, and max RPM relate to speed/cruise? How do Gas/Diesel compare?

    leaky, Oct 20, 2015 ... 3 4 5
    Replies:
    67
    Views:
    21,828
    Barry
    Nov 11, 2015
  3. Seagem

    Discussion: Pocket Cruising Power Catamaran Design for Recession Times...

    Seagem, Jan 11, 2009 ... 3 4 5
    Replies:
    67
    Views:
    66,523
    brian eiland
    Jul 16, 2010
  4. Catboy

    Trophy 2152 WA (Boat Construction?)

    Catboy, Dec 12, 2020 ... 3 4 5
    Replies:
    66
    Views:
    12,150
    mudsailor
    Dec 28, 2020
  5. Aransas Flats Rat

    Help drawing and design Texas Scooter boat

    Aransas Flats Rat, Jan 31, 2020 ... 3 4 5
    Replies:
    66
    Views:
    11,618
    Aransas Flats Rat
    Apr 8, 2020
  6. Steph357

    Semi displacement hull

    Steph357, Nov 15, 2009 ... 3 4 5
    Replies:
    62
    Views:
    56,249
    tom28571
    Jan 4, 2011
  7. sabahcat

    Boat prices in Australia taking a tumble

    sabahcat, Feb 5, 2012 ... 3 4 5
    Replies:
    61
    Views:
    10,414
    michael pierzga
    Feb 10, 2012
  8. Sprint 18.5

    Mercruiser engine aglinment

    Sprint 18.5, Aug 10, 2021 ... 3 4 5
    Replies:
    60
    Views:
    6,725
    Sprint 18.5
    Sep 29, 2021
  9. crowsridge

    Repower questions

    crowsridge, Sep 13, 2010 ... 3 4 5
    Replies:
    60
    Views:
    11,356
    WestVanHan
    Oct 5, 2010
  10. Phil Mayleben

    Air Injection

    Phil Mayleben, Jan 11, 2010 ... 3 4 5
    Replies:
    60
    Views:
    10,334
    mydauphin
    Jan 17, 2010
  11. waikikin

    Low displacement coastal cruiser around 40' / 12M

    waikikin, Nov 20, 2020 ... 2 3 4
    Replies:
    59
    Views:
    19,203
    Paul Scott
    Dec 4, 2022
  12. Krauthammer

    AeroCat power cats, opinions?

    Krauthammer, Dec 6, 2011 ... 2 3 4
    Replies:
    58
    Views:
    17,910
    Wavewacker
    Jan 19, 2012
  13. KeithO

    Get feet wet / Great Lakes / Loop sailboat - power conversion project

    KeithO, Jun 6, 2020 ... 2 3 4
    Replies:
    57
    Views:
    6,667
    gonzo
    Feb 8, 2021
  14. SinkingDream

    a little astray, but what could you do w/ a boat like this?

    SinkingDream, Apr 9, 2018 ... 2 3 4
    Replies:
    57
    Views:
    11,947
    kjg
    Jul 4, 2018
  15. Quick Karl

    Gardner's Clamming Skiff

    Quick Karl, Dec 28, 2014 ... 2 3 4
    Replies:
    57
    Views:
    13,982
    PAR
    Jan 12, 2015
  16. Tim.M

    Do sterndrives (bellows) sink boats?

    Tim.M, Apr 17, 2009 ... 2 3 4
    Replies:
    57
    Views:
    58,619
    2farnorth
    May 20, 2009
  17. Portager

    Dream Engines

    Portager, Jun 26, 2002 ... 2 3 4
    Replies:
    55
    Views:
    30,235
    FAST FRED
    Jan 15, 2005
  18. silentneko

    1967 Hobo Houseboat rebuild, and mods

    silentneko, Nov 20, 2023 ... 2 3 4
    Replies:
    53
    Views:
    6,027
    jbo_c
    Apr 20, 2024 at 4:57 PM
  19. Austin

    Dorado 30 High speed stability

    Austin, Apr 24, 2020 ... 2 3 4
    Replies:
    53
    Views:
    10,525
    sailhand
    Mar 8, 2022
  20. Ryon Macey

    Stepped Hulls

    Ryon Macey, Oct 26, 2001 ... 2 3 4
    Replies:
    53
    Views:
    65,496
    Frans X L
    Aug 1, 2004
  21. cyclops2

    Constant deep V deadrise. Powering up angle.

    cyclops2, Sep 18, 2011 ... 2 3 4
    Replies:
    52
    Views:
    12,167
    cyclops2
    Oct 5, 2011
  22. yli nick

    restoring old mahogany small boat

    yli nick, Jul 31, 2018 ... 2 3 4
    Replies:
    51
    Views:
    9,680
    yli nick
    Jan 10, 2022
  23. member 65088

    Please help me identify this boat

    member 65088, Aug 7, 2018 ... 2 3 4
    Replies:
    50
    Views:
    5,457
    member 65088
    Aug 13, 2018
  24. Boatwiser

    Water Ingestion Into I/o Merc Engine

    Boatwiser, Sep 22, 2015 ... 2 3 4
    Replies:
    50
    Views:
    14,413
    tom kane
    Oct 3, 2015
  25. rasorinc
    Locked

    John Deere ENGINES made it China

    rasorinc, Sep 12, 2015 ... 2 3 4
    Replies:
    50
    Views:
    9,244
    Boat Design Net Moderator
    Sep 25, 2015
  26. Tdela55

    1974 455 Oldsmobile jetboat engine

    Tdela55, Nov 21, 2005 ... 2 3 4
    Replies:
    49
    Views:
    63,703
    NorCal
    Dec 9, 2011
  27. sdowney717

    increase engine heat for better efficiency?

    sdowney717, Nov 19, 2013 ... 2 3 4
    Replies:
    48
    Views:
    8,200
    FAST FRED
    Nov 26, 2013
  28. decoguy

    FPB64 or Fleming 58 or Buehler Ellemaid?

    decoguy, Dec 16, 2012 ... 2 3 4
    Replies:
    48
    Views:
    20,550
    goodwilltoall
    Apr 6, 2013
  29. cioko

    Stepped hull

    cioko, Sep 13, 2007 ... 2 3 4
    Replies:
    48
    Views:
    28,352
    tunnels
    Nov 12, 2012
  30. axeman

    Ninigret Flare

    axeman, Sep 23, 2011 ... 2 3 4
    Replies:
    48
    Views:
    19,474
    Easy Rider
    Nov 5, 2011
  31. CatBuilder

    Operating Cost of 70' Steel Fishing Vessel?

    CatBuilder, Sep 15, 2010 ... 2 3 4
    Replies:
    48
    Views:
    16,250
    apex1
    Sep 18, 2010
  32. Vulkyn

    Question about commercial speed boats

    Vulkyn, Aug 13, 2010 ... 2 3 4
    Replies:
    48
    Views:
    7,185
    apex1
    Sep 4, 2010
  33. mark424x

    Displacement Glider, PowerKeel, etc?

    mark424x, Jul 3, 2006 ... 2 3 4
    Replies:
    46
    Views:
    27,166
    Stephen Ditmore
    Jan 1, 2024
  34. Standpipe

    Atkins - compared to modern design/materials

    Standpipe, Feb 26, 2015 ... 2 3 4
    Replies:
    46
    Views:
    12,845
    Dorydude
    Aug 20, 2017
  35. magwas

    Is it stable enough for a powerboat?

    magwas, Aug 29, 2010 ... 2 3 4
    Replies:
    46
    Views:
    8,749
    magwas
    Sep 7, 2010
  36. FAST FRED

    Jersey Sea Skiff Performance?

    FAST FRED, Feb 18, 2007 ... 2 3 4
    Replies:
    46
    Views:
    32,248
    kengrome
    Apr 21, 2007
  37. Quatsino Boater

    I would like help with a 38-45 foot trawler design

    Quatsino Boater, Feb 18, 2011 ... 2 3 4
    Replies:
    45
    Views:
    22,564
    phillysailor
    Nov 17, 2019
  38. tunnels

    How do we reduce skin friction ??

    tunnels, Oct 16, 2011 ... 2 3 4
    Replies:
    45
    Views:
    20,273
    tunnels
    Jun 24, 2013
  39. RMP

    helm on the starboard or the port side?

    RMP, Mar 28, 2003 ... 2 3 4
    Replies:
    45
    Views:
    40,297
    Frosty
    Aug 11, 2012
  40. fcfc

    Yet another efficient powerboat that do NOT sell ...

    fcfc, Jul 22, 2011 ... 2 3 4
    Replies:
    45
    Views:
    19,885
    longcours62
    Feb 13, 2012
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