Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    542
    Messages:
    6,432
    Latest: Availability of 6 spline props BlueBell, Dec 30, 2024
    RSS

  2. Surface Drives

    Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
    Discussions:
    186
    Messages:
    2,863
    Latest: Inboard surface drive small boat. Master spearfisher, Sep 8, 2024
    RSS

  3. Jet Drives

    Jet Drives (pumps, impellers, etc.)
    Discussions:
    461
    Messages:
    4,436
    Latest: Vospower water jets Ovrthhills, Aug 20, 2024
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,040
    Messages:
    10,006
    Latest: 6 spline prop availability pistnbroke, Dec 23, 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:
    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:
    538
    Messages:
    4,991
    Latest: Magnetic couplings portacruise, Oct 25, 2024
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    689
    Messages:
    8,587
    Latest: Mild overhaul and then repower, Cat 3208 to ? gonzo, Jan 9, 2025 at 11:06 AM
    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:
    2,092
    Latest: In which way are diagrams for BL DC motors derived (and to understand)? Heimfried, Jan 10, 2025 at 2:22 PM
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,257
    Latest: Trolling Motor(s) for Primary Propulsion of 15' AL 'skiff' cahudson42, May 31, 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:
    5,577
    Latest: VW/AUDI 3.0TDI marinising Skravo, Aug 18, 2024
    RSS
Page 1 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. brian eiland

    Exciting New EPS Thruster (& Propulsion)

    brian eiland, Nov 16, 2005 ... 4 5 6
    Replies:
    86
    Views:
    105,207
    johnnydfred
    Jan 9, 2025 at 9:04 PM
  2. Sea Monkey

    Hydraulic start

    Sea Monkey, Oct 15, 2024
    Replies:
    4
    Views:
    1,164
    gonzo
    Oct 16, 2024
  3. wroc

    Kick-up propeller shaft for shallow draft

    wroc, Oct 8, 2024 ... 2
    Replies:
    18
    Views:
    980
    gonzo
    Oct 9, 2024
  4. Jason Rodgers

    Unequal size exhaust hose and thru hull connection

    Jason Rodgers, Sep 9, 2024
    Replies:
    6
    Views:
    882
    seasquirt
    Sep 10, 2024
  5. DaveAtAmazingGrace

    Aquadrive CV Joint Spraying Grease

    DaveAtAmazingGrace, Aug 9, 2024
    Replies:
    9
    Views:
    1,020
    DogCavalry
    Aug 13, 2024
  6. Mark Klep

    Deciding on the best axle for my sailingboat

    Mark Klep, Jul 18, 2024
    Replies:
    1
    Views:
    723
    gonzo
    Jul 19, 2024
  7. scav000

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

    scav000, Apr 9, 2024
    Replies:
    3
    Views:
    1,984
    fallguy
    Apr 19, 2024
  8. cmb1998

    Propulsion for a 36ft aluminum boat

    cmb1998, Apr 12, 2024
    Replies:
    11
    Views:
    1,314
    BlueBell
    Apr 14, 2024
  9. David Swingler

    Outdrive to Inboard conversion

    David Swingler, Mar 22, 2024
    Replies:
    9
    Views:
    1,543
    fallguy
    Mar 22, 2024
  10. DCockey

    Yamaha acquires Torqeedo

    DCockey, Jan 19, 2024
    Replies:
    5
    Views:
    2,184
    Paul Scott
    Jan 24, 2024
  11. paticus

    Gear ratio for houseboat

    paticus, Oct 27, 2023
    Replies:
    13
    Views:
    2,581
    gonzo
    Oct 30, 2023
  12. paticus

    Re-powering a houseboat - Stay with Stern drive?

    paticus, Oct 10, 2023 ... 2
    Replies:
    17
    Views:
    2,593
    paticus
    Oct 27, 2023
  13. Guillermo

    New propulsion sytems for ships

    Guillermo, Dec 2, 2005 ... 37 38 39
    Replies:
    579
    Views:
    188,123
    fredrosse
    Oct 8, 2023
  14. MarkOHara

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

    MarkOHara, Jul 4, 2023
    Replies:
    5
    Views:
    1,746
    Rumars
    Jul 5, 2023
  15. naserrishehri

    Power efficiency

    naserrishehri, Jun 7, 2023 ... 2
    Replies:
    16
    Views:
    3,601
    TANSL
    Jun 11, 2023
  16. valter.f

    Twin stern tube propeller with only one engine

    valter.f, May 24, 2023 ... 2
    Replies:
    15
    Views:
    3,232
    valter.f
    Jun 1, 2023
  17. Flat bottom girl

    Large hp outboard on a tri

    Flat bottom girl, Mar 12, 2023
    Replies:
    2
    Views:
    1,746
    Paul Scott
    May 14, 2023
  18. Forecaddie

    Outboard sail drive

    Forecaddie, May 11, 2023
    Replies:
    8
    Views:
    1,349
    Forecaddie
    May 14, 2023
  19. BigMuddy

    Sternwheeler Power Requirements

    BigMuddy, Jan 17, 2022 ... 2
    Replies:
    22
    Views:
    6,036
    Spokart
    Apr 20, 2023
  20. rivergybsy

    Air boat for flood emergency

    rivergybsy, Jan 28, 2023
    Replies:
    3
    Views:
    1,651
    portacruise
    Jan 30, 2023
  21. TheyCallMeTrinity

    15 foot Aluminum Boat with Z482 Kubota

    TheyCallMeTrinity, Oct 12, 2022 ... 2
    Replies:
    28
    Views:
    5,803
    TheyCallMeTrinity
    Jan 2, 2023
  22. Andy58

    RPM to Speed

    Andy58, Oct 16, 2022
    Replies:
    9
    Views:
    1,892
    Andy58
    Oct 18, 2022
  23. telak

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

    telak, Jun 29, 2022 ... 2
    Replies:
    17
    Views:
    3,863
    telak
    Aug 9, 2022
  24. mackid068

    Favorite Type of Power for a Powerboat

    mackid068, Jun 27, 2005 ... 2 3
    Replies:
    38
    Views:
    12,061
    BlueBell
    Jul 28, 2022
  25. emrecantasdemir

    Dual - Fuel marine engines

    emrecantasdemir, Jun 3, 2022
    Replies:
    6
    Views:
    1,577
    baeckmo
    Jun 4, 2022
  26. DogCavalry

    Power to Weight Ratio

    DogCavalry, Apr 16, 2022
    Replies:
    9
    Views:
    2,025
    jehardiman
    Apr 17, 2022
  27. Ruffner Sedurifa

    Propeller Puller

    Ruffner Sedurifa, Mar 29, 2022
    Replies:
    10
    Views:
    2,039
    Ruffner Sedurifa
    Apr 3, 2022
  28. Kirk

    How to make a pedal powered prop.

    Kirk, Feb 24, 2022 ... 2
    Replies:
    15
    Views:
    10,010
    Kirk
    Feb 28, 2022
  29. DCockey

    Mercury 175 HP Outboard Diesel Fuel Spark Ignition

    DCockey, Feb 2, 2022
    Replies:
    4
    Views:
    2,747
    DogCavalry
    Feb 4, 2022
  30. captdon65

    prop pocket/tunnel problem solutions

    captdon65, Nov 28, 2016
    Replies:
    10
    Views:
    5,999
    Mike Goebel
    Jan 24, 2022
  31. alby joy

    Engine not reaching Rated RPM during gearbox engaged

    alby joy, Sep 2, 2021
    Replies:
    11
    Views:
    3,650
    comfisherman
    Nov 9, 2021
  32. LePrince

    Tug Bullard Pull Calculations

    LePrince, Oct 24, 2021
    Replies:
    6
    Views:
    2,109
    LePrince
    Oct 29, 2021
  33. Guest625101138

    DDWFTTW - Directly Downwind Faster Than The Wind

    Guest625101138, Jan 4, 2009 ... 38 39 40
    Replies:
    588
    Views:
    137,062
    gonzo
    Oct 4, 2021
  34. Rasmith

    Bio Inspired Propulsion

    Rasmith, Aug 28, 2021
    Replies:
    7
    Views:
    2,909
    Rasmith
    Sep 30, 2021
  35. HeyK20

    How are Thai Long Tail Boats Cooled?

    HeyK20, Jun 22, 2021
    Replies:
    3
    Views:
    2,651
    gonzo
    Aug 27, 2021
  36. yipster

    dual prop shaft ?

    yipster, Oct 30, 2002 ... 2 3
    Replies:
    34
    Views:
    41,811
    Christian Lucas
    May 17, 2021
  37. NikRitz

    Kayak motor

    NikRitz, Apr 22, 2020 ... 2
    Replies:
    23
    Views:
    6,618
    SolGato
    Apr 26, 2021
  38. tom kane

    Define what a Surface-Piercing propeller is

    tom kane, Jul 12, 2009 ... 13 14 15
    Replies:
    212
    Views:
    80,766
    tom kane
    Feb 18, 2021
  39. boat3630

    Test borg warner transmissions

    boat3630, Dec 31, 2020
    Replies:
    9
    Views:
    3,177
    gonzo
    Jan 3, 2021
  40. marufuddin0

    3D Propeller Design

    marufuddin0, Dec 13, 2020
    Replies:
    7
    Views:
    3,989
    Heimfried
    Dec 21, 2020
Showing threads 1 to 40 of 982

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