Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    536
    Messages:
    6,281
    Latest: Thoughts on prop load for com-fish/tow boat NWestward, Apr 25, 2024 at 4:15 AM
    RSS

  2. Surface Drives

    Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
    Discussions:
    186
    Messages:
    2,860
    Latest: Longtail Evolution Dave G 9N, Jan 20, 2024
    RSS

  3. Jet Drives

    Jet Drives (pumps, impellers, etc.)
    Discussions:
    461
    Messages:
    4,433
    Latest: need intake or picture of for (berk)6jA Ike, Apr 25, 2024 at 1:05 AM
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,029
    Messages:
    9,902
    Latest: How many adjustment points are there on a 1999 25 hp carb? valvebounce, Feb 27, 2024
    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:
    547
    Messages:
    3,828
    Latest: Welded metal belows - would that work for sterndrive? Nidza, Oct 20, 2023
    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:
    535
    Messages:
    4,968
    Latest: Use oversized flexible coupling? comfisherman, Mar 9, 2024
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    682
    Messages:
    8,498
    Latest: Hino WO4CTI in a 26' Tollycraft David Swingler, Mar 22, 2024
    RSS

  9. Gas Engines

    Gasoline Engines
    Discussions:
    422
    Messages:
    4,650
    Latest: starting rebuild engine comfisherman, Aug 31, 2023
    RSS

  10. Electric Propulsion

    Electric propulsion systems
    Discussions:
    99
    Messages:
    1,952
    Latest: ask for help in Converting a propulsion system for a tugboat to a fully electric Rumars, Apr 9, 2024
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,256
    Latest: Hydrogen Fuel cells for ships DogCavalry, Jan 3, 2024
    RSS

  12. DIY Marinizing

    A forum to discuss "do it yourself" marinizing of engines / conversion of automotive engines to marine use.
    Discussions:
    276
    Messages:
    5,576
    Latest: New Detroit Diesel Marinization Chris Konrad, Feb 14, 2024
    RSS
Page 1 of 25
Sort By:
Title Start Date ↓
Replies Views
Last Message
  1. cmb1998

    Propulsion for a 36ft aluminum boat

    cmb1998, Apr 12, 2024
    Replies:
    11
    Views:
    434
    BlueBell
    Apr 14, 2024
  2. scav000

    Can you run the main engine submerged while still on the dry dock?

    scav000, Apr 9, 2024
    Replies:
    3
    Views:
    382
    fallguy
    Apr 19, 2024
  3. David Swingler

    Outdrive to Inboard conversion

    David Swingler, Mar 22, 2024
    Replies:
    9
    Views:
    572
    fallguy
    Mar 22, 2024
  4. DCockey

    Yamaha acquires Torqeedo

    DCockey, Jan 19, 2024
    Replies:
    5
    Views:
    1,677
    Paul Scott
    Jan 24, 2024
  5. paticus

    Gear ratio for houseboat

    paticus, Oct 27, 2023
    Replies:
    13
    Views:
    1,907
    gonzo
    Oct 30, 2023
  6. paticus

    Re-powering a houseboat - Stay with Stern drive?

    paticus, Oct 10, 2023 ... 2
    Replies:
    17
    Views:
    1,555
    paticus
    Oct 27, 2023
  7. MarkOHara

    Versilcraft / C.L.M. Studio Tecnico Navale, where are they now?

    MarkOHara, Jul 4, 2023
    Replies:
    5
    Views:
    1,334
    Rumars
    Jul 5, 2023
  8. naserrishehri

    Power efficiency

    naserrishehri, Jun 7, 2023 ... 2
    Replies:
    16
    Views:
    2,708
    TANSL
    Jun 11, 2023
  9. valter.f

    Twin stern tube propeller with only one engine

    valter.f, May 24, 2023 ... 2
    Replies:
    15
    Views:
    2,288
    valter.f
    Jun 1, 2023
  10. Forecaddie

    Outboard sail drive

    Forecaddie, May 11, 2023
    Replies:
    8
    Views:
    927
    Forecaddie
    May 14, 2023
  11. Flat bottom girl

    Large hp outboard on a tri

    Flat bottom girl, Mar 12, 2023
    Replies:
    2
    Views:
    1,338
    Paul Scott
    May 14, 2023
  12. rivergybsy

    Air boat for flood emergency

    rivergybsy, Jan 28, 2023
    Replies:
    3
    Views:
    1,288
    portacruise
    Jan 30, 2023
  13. Andy58

    RPM to Speed

    Andy58, Oct 16, 2022
    Replies:
    9
    Views:
    1,112
    Andy58
    Oct 18, 2022
  14. TheyCallMeTrinity

    15 foot Aluminum Boat with Z482 Kubota

    TheyCallMeTrinity, Oct 12, 2022 ... 2
    Replies:
    28
    Views:
    4,598
    TheyCallMeTrinity
    Jan 2, 2023
  15. telak

    Evinrude E-tec 300hp v6 what/how to check?

    telak, Jun 29, 2022 ... 2
    Replies:
    17
    Views:
    3,200
    telak
    Aug 9, 2022
  16. emrecantasdemir

    Dual - Fuel marine engines

    emrecantasdemir, Jun 3, 2022
    Replies:
    6
    Views:
    1,173
    baeckmo
    Jun 4, 2022
  17. DogCavalry

    Power to Weight Ratio

    DogCavalry, Apr 16, 2022
    Replies:
    9
    Views:
    1,533
    jehardiman
    Apr 17, 2022
  18. Ruffner Sedurifa

    Propeller Puller

    Ruffner Sedurifa, Mar 29, 2022
    Replies:
    10
    Views:
    1,500
    Ruffner Sedurifa
    Apr 3, 2022
  19. Kirk

    How to make a pedal powered prop.

    Kirk, Feb 24, 2022 ... 2
    Replies:
    15
    Views:
    5,819
    Kirk
    Feb 28, 2022
  20. DCockey

    Mercury 175 HP Outboard Diesel Fuel Spark Ignition

    DCockey, Feb 2, 2022
    Replies:
    4
    Views:
    1,885
    DogCavalry
    Feb 4, 2022
  21. BigMuddy

    Sternwheeler Power Requirements

    BigMuddy, Jan 17, 2022 ... 2
    Replies:
    22
    Views:
    4,523
    Spokart
    Apr 20, 2023
  22. LePrince

    Tug Bullard Pull Calculations

    LePrince, Oct 24, 2021
    Replies:
    6
    Views:
    1,540
    LePrince
    Oct 29, 2021
  23. alby joy

    Engine not reaching Rated RPM during gearbox engaged

    alby joy, Sep 2, 2021
    Replies:
    11
    Views:
    2,400
    comfisherman
    Nov 9, 2021
  24. Rasmith

    Bio Inspired Propulsion

    Rasmith, Aug 28, 2021
    Replies:
    7
    Views:
    2,164
    Rasmith
    Sep 30, 2021
  25. HeyK20

    How are Thai Long Tail Boats Cooled?

    HeyK20, Jun 22, 2021
    Replies:
    3
    Views:
    1,876
    gonzo
    Aug 27, 2021
  26. boat3630

    Test borg warner transmissions

    boat3630, Dec 31, 2020
    Replies:
    9
    Views:
    2,549
    gonzo
    Jan 3, 2021
  27. marufuddin0

    3D Propeller Design

    marufuddin0, Dec 13, 2020
    Replies:
    7
    Views:
    3,102
    Heimfried
    Dec 21, 2020
  28. CAPT. Ted

    Conversion from Marine V-8 to 4 cyl diesel.

    CAPT. Ted, Oct 11, 2020
    Replies:
    2
    Views:
    2,612
    brendan gardam
    Oct 12, 2020
  29. AAn

    Wave force induced power proa magnetic propulsion

    AAn, Sep 3, 2020
    Replies:
    7
    Views:
    2,422
    Will Gilmore
    Sep 4, 2020
  30. hlblake

    1994 Crusader Xli

    hlblake, Aug 20, 2020 ... 2
    Replies:
    24
    Views:
    2,983
    brendan gardam
    Aug 25, 2020
  31. Manateeman

    Turbo coating with ceramics

    Manateeman, Aug 13, 2020
    Replies:
    4
    Views:
    1,503
    KeithO
    Aug 17, 2020
  32. Bradleylarkin

    Best Propulsion system for my boat

    Bradleylarkin, Jul 29, 2020
    Replies:
    7
    Views:
    1,871
    kapnD
    Aug 2, 2020
  33. YSS Caribbean

    Daily fuel consumption calculation

    YSS Caribbean, Jun 29, 2020
    Replies:
    7
    Views:
    2,036
    YSS Caribbean
    Jun 30, 2020
  34. aybabtme

    Fuel system plumbing (diesel)

    aybabtme, May 30, 2020
    Replies:
    4
    Views:
    1,740
    Jeremey Stadnik
    Dec 8, 2020
  35. Andre Raath

    marinized 240D running hot

    Andre Raath, May 9, 2020 ... 2
    Replies:
    20
    Views:
    3,532
    sdowney717
    Jul 20, 2020
  36. Bharat Kandpal

    Calculations for designing a propeller?

    Bharat Kandpal, May 1, 2020
    Replies:
    5
    Views:
    1,940
    gonzo
    May 10, 2020
  37. NikRitz

    Kayak motor

    NikRitz, Apr 22, 2020 ... 2
    Replies:
    23
    Views:
    5,496
    SolGato
    Apr 26, 2021
  38. Barry

    New Propeller Design

    Barry, Apr 2, 2020
    Replies:
    6
    Views:
    2,720
    Barry
    Apr 3, 2020
  39. Vronsky

    Bow thruster installation

    Vronsky, Jan 20, 2020
    Replies:
    10
    Views:
    1,899
    Vronsky
    Jan 21, 2020
  40. IronTom

    JetSki motorcycle engine - Loud and Hot exhaust

    IronTom, Dec 1, 2019
    Replies:
    3
    Views:
    2,339
    ondarvr
    Dec 1, 2019
Showing threads 1 to 40 of 977

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