Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    543
    Messages:
    6,436
    Latest: Seeking Input for DIY Propeller Cleaning Tool – Master's Thesis Research Survey gonzo, Apr 29, 2025
    RSS

  2. Surface Drives

    Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
    Discussions:
    186
    Messages:
    2,864
    Latest: Is Levi Drives still in business? BlueBell, May 30, 2025
    RSS

  3. Jet Drives

    Jet Drives (pumps, impellers, etc.)
    Discussions:
    463
    Messages:
    4,452
    Latest: drive for landing craft used on both ocean and rivers DogCavalry, Feb 10, 2025
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,044
    Messages:
    10,061
    Latest: OXE Diesel Outboard Experiences? comfisherman, Jun 2, 2025
    RSS

  5. Sterndrives

    Stern drive lower and upper units, transom and gimbal assemblies, steering, and trim pumps. Mercruiser (Alpha One, Alpha One Generation II, Alpha SS, Bravo One, Bravo Two, Bravo Three, Bravo XR Sportmaster, TRS, Speed Master), IMCO, ILMOR, Konrad, OMC, Volvo Penta
    Discussions:
    549
    Messages:
    3,839
    Latest: Stern Powr Parts Laurence Bellamy, Aug 3, 2024
    RSS

  6. Pod Drives

    Volvo IPS, ZF, CMD Zeus, and other pod-drive systems
    Discussions:
    29
    Messages:
    299
    Latest: 50-200 hp electric pod with nozzle and motor on hub? ram68ocean, Jul 5, 2021
    RSS

  7. Inboards

    Inboard and Vee-drive hardware: struts, stuffing boxes, transmissions, coolers
    Discussions:
    540
    Messages:
    5,009
    Latest: Velvet Drive CR2 drop center gear. Carteret, Jun 21, 2025
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    691
    Messages:
    8,624
    Latest: 38' 1984 posillipo technema with Fiat Iveco diesel engines question comfisherman, Jun 6, 2025
    RSS

  9. Gas Engines

    Gasoline Engines
    Discussions:
    423
    Messages:
    4,652
    Latest: Anyone need a torque monster 383 SBC? gonzo, Sep 24, 2024
    RSS

  10. Electric Propulsion

    Electric propulsion systems
    Discussions:
    106
    Messages:
    2,119
    Latest: Sizing a propeller to match an electric motor gonzo, Jun 10, 2025
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,275
    Latest: Hydraulic Drive for max efficiency Rumars, May 6, 2025
    RSS

  12. DIY Marinizing

    A forum to discuss "do it yourself" marinizing of engines / conversion of automotive engines to marine use.
    Discussions:
    276
    Messages:
    5,577
    Latest: VW/AUDI 3.0TDI marinising Skravo, Aug 18, 2024
    RSS
Page 2 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. tom kane

    Define what a Surface-Piercing propeller is

    tom kane, Jul 12, 2009 ... 13 14 15
    Replies:
    212
    Views:
    84,413
    tom kane
    Feb 18, 2021
  2. boat3630

    Test borg warner transmissions

    boat3630, Dec 31, 2020
    Replies:
    9
    Views:
    3,797
    gonzo
    Jan 3, 2021
  3. marufuddin0

    3D Propeller Design

    marufuddin0, Dec 13, 2020
    Replies:
    7
    Views:
    4,660
    Heimfried
    Dec 21, 2020
  4. aybabtme

    Fuel system plumbing (diesel)

    aybabtme, May 30, 2020
    Replies:
    4
    Views:
    2,499
    Jeremey Stadnik
    Dec 8, 2020
  5. brian eiland

    FLYWHEEL Energy Storage Systems

    brian eiland, Apr 21, 2010 ... 3 4 5
    Replies:
    69
    Views:
    40,617
    brian eiland
    Nov 16, 2020
  6. CAPT. Ted

    Conversion from Marine V-8 to 4 cyl diesel.

    CAPT. Ted, Oct 11, 2020
    Replies:
    2
    Views:
    4,002
    brendan gardam
    Oct 12, 2020
  7. AAn

    Wave force induced power proa magnetic propulsion

    AAn, Sep 3, 2020
    Replies:
    7
    Views:
    3,520
    Will Gilmore
    Sep 4, 2020
  8. hlblake

    1994 Crusader Xli

    hlblake, Aug 20, 2020 ... 2
    Replies:
    24
    Views:
    4,372
    brendan gardam
    Aug 25, 2020
  9. Manateeman

    Turbo coating with ceramics

    Manateeman, Aug 13, 2020
    Replies:
    4
    Views:
    2,243
    KeithO
    Aug 17, 2020
  10. Bradleylarkin

    Best Propulsion system for my boat

    Bradleylarkin, Jul 29, 2020
    Replies:
    7
    Views:
    2,565
    kapnD
    Aug 2, 2020
  11. Silverbreeze

    Diesel Outboards

    Silverbreeze, Jul 4, 2016 ... 2
    Replies:
    29
    Views:
    13,422
    Boatman1011
    Jul 31, 2020
  12. Andre Raath

    marinized 240D running hot

    Andre Raath, May 9, 2020 ... 2
    Replies:
    20
    Views:
    4,865
    sdowney717
    Jul 20, 2020
  13. UNCIVILIZED

    Help with a Repower,maybe with a Hand Crank Diesel?

    UNCIVILIZED, Aug 26, 2014
    Replies:
    13
    Views:
    5,409
    brendan gardam
    Jul 1, 2020
  14. YSS Caribbean

    Daily fuel consumption calculation

    YSS Caribbean, Jun 29, 2020
    Replies:
    7
    Views:
    2,770
    YSS Caribbean
    Jun 30, 2020
  15. JunkRat

    Looking for basic power formulas for electric drive...

    JunkRat, Jan 27, 2019 ... 2
    Replies:
    18
    Views:
    8,688
    Yobarnacle
    May 22, 2020
  16. Bharat Kandpal

    Calculations for designing a propeller?

    Bharat Kandpal, May 1, 2020
    Replies:
    5
    Views:
    2,649
    gonzo
    May 10, 2020
  17. brian eiland

    Retractable Marine Drives

    brian eiland, Aug 3, 2016 ... 2 3
    Replies:
    30
    Views:
    12,907
    brian eiland
    Apr 14, 2020
  18. Barry

    New Propeller Design

    Barry, Apr 2, 2020
    Replies:
    6
    Views:
    3,586
    Barry
    Apr 3, 2020
  19. Vronsky

    Bow thruster installation

    Vronsky, Jan 20, 2020
    Replies:
    10
    Views:
    2,496
    Vronsky
    Jan 21, 2020
  20. IronTom

    JetSki motorcycle engine - Loud and Hot exhaust

    IronTom, Dec 1, 2019
    Replies:
    3
    Views:
    3,122
    ondarvr
    Dec 1, 2019
  21. Victor R

    Flapping Foil

    Victor R, Sep 7, 2019
    Replies:
    3
    Views:
    3,308
    Victor R
    Oct 21, 2019
  22. Adarsh Edakkote

    Pusher tug-barge

    Adarsh Edakkote, Oct 4, 2019
    Replies:
    0
    Views:
    2,355
    Adarsh Edakkote
    Oct 4, 2019
  23. michael smith

    wheel size

    michael smith, Jun 7, 2019
    Replies:
    7
    Views:
    2,583
    jehardiman
    Jun 9, 2019
  24. michael smith

    paddle wheel

    michael smith, May 12, 2019
    Replies:
    6
    Views:
    2,848
    jehardiman
    May 16, 2019
  25. highlandhoh3

    outboard in center of shanty boat

    highlandhoh3, Mar 29, 2019
    Replies:
    9
    Views:
    2,665
    Boat Design Net Moderator
    Mar 29, 2019
  26. Dr34m3r

    Article on Waterjet propulsion

    Dr34m3r, Mar 7, 2019
    Replies:
    0
    Views:
    2,722
    Dr34m3r
    Mar 7, 2019
  27. oliver.ilg

    Cable or Chain Ferry

    oliver.ilg, Mar 11, 2015 ... 2
    Replies:
    23
    Views:
    12,960
    Solar Guy
    Mar 2, 2019
  28. Jamesmcl

    Twin outboard prop replacement

    Jamesmcl, Feb 1, 2019
    Replies:
    2
    Views:
    2,500
    Mr Efficiency
    Feb 2, 2019
  29. xellz

    Propulsion general questions for heavy use on 30ft power cat.

    xellz, Dec 29, 2018 ... 2
    Replies:
    24
    Views:
    5,155
    JunkRat
    Jan 27, 2019
  30. Magnus W

    What source for electric energy in a hybrid system?

    Magnus W, Dec 20, 2018 ... 2
    Replies:
    23
    Views:
    4,751
    Christian Lucas
    Jan 25, 2019
  31. Pceditorpro

    Buying or Building a Z Drive?

    Pceditorpro, Dec 3, 2018
    Replies:
    11
    Views:
    4,864
    xrudi
    Jan 12, 2019
  32. Barry

    Low speed trolling with large Horsepower Motors

    Barry, Jan 9, 2019
    Replies:
    5
    Views:
    3,494
    tpenfield
    Jan 11, 2019
  33. captainralph

    DIY Gas Sep Combo

    captainralph, Dec 23, 2018
    Replies:
    2
    Views:
    2,160
    captainralph
    Dec 24, 2018
  34. Brian.Lin

    tug boat engine mounts design (rigid? or flexible?)

    Brian.Lin, Nov 16, 2018
    Replies:
    13
    Views:
    3,655
    Ad Hoc
    Nov 20, 2018
  35. Afilimon

    How to select motors for catamaran?

    Afilimon, Nov 4, 2018 ... 2
    Replies:
    16
    Views:
    5,117
    gonzo
    Nov 8, 2018
  36. DCockey

    Raw seawater as only fuel claim

    DCockey, Sep 28, 2018
    Replies:
    8
    Views:
    2,975
    Blueknarr
    Sep 29, 2018
  37. Archangl7

    electric golf cart inboard design, need help!

    Archangl7, Sep 4, 2018
    Replies:
    7
    Views:
    4,588
    Archangl7
    Sep 13, 2018
  38. ocean dreamer

    Yachting propulsion systems

    ocean dreamer, Sep 2, 2018
    Replies:
    4
    Views:
    2,462
    JamesG123
    Sep 2, 2018
  39. crwsound

    Velvet Drive: How to Separate Reduction Housing from Gearbox?

    crwsound, Aug 5, 2018
    Replies:
    9
    Views:
    6,708
    MikeJohns
    Aug 7, 2018
  40. James007

    convert inboard to outboard

    James007, Nov 20, 2008
    Replies:
    6
    Views:
    10,094
    Butch
    Jul 11, 2018
Showing threads 41 to 80 of 985

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