Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    541
    Messages:
    6,421
    Latest: Power predition formula Dave G 9N, Oct 16, 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:
    1,039
    Messages:
    9,982
    Latest: Interesting starter failure BlueBell, Nov 21, 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:
    8,586
    Latest: Help with the selection of 6.5 v8 hammerhead spare parts gonzo, Dec 3, 2024 at 1:04 PM
    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:
    103
    Messages:
    2,029
    Latest: Electric inboard motor, my journey to find proper motor yabert, Dec 8, 2024 at 8:28 AM
    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. Sea Monkey

    Hydraulic start

    Sea Monkey, Oct 15, 2024
    Replies:
    4
    Views:
    954
    gonzo
    Oct 16, 2024
  2. wroc

    Kick-up propeller shaft for shallow draft

    wroc, Oct 8, 2024 ... 2
    Replies:
    18
    Views:
    828
    gonzo
    Oct 9, 2024
  3. Jason Rodgers

    Unequal size exhaust hose and thru hull connection

    Jason Rodgers, Sep 9, 2024
    Replies:
    6
    Views:
    815
    seasquirt
    Sep 10, 2024
  4. DaveAtAmazingGrace

    Aquadrive CV Joint Spraying Grease

    DaveAtAmazingGrace, Aug 9, 2024
    Replies:
    9
    Views:
    905
    DogCavalry
    Aug 13, 2024
  5. Mark Klep

    Deciding on the best axle for my sailingboat

    Mark Klep, Jul 18, 2024
    Replies:
    1
    Views:
    658
    gonzo
    Jul 19, 2024
  6. scav000

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

    scav000, Apr 9, 2024
    Replies:
    3
    Views:
    1,910
    fallguy
    Apr 19, 2024
  7. cmb1998

    Propulsion for a 36ft aluminum boat

    cmb1998, Apr 12, 2024
    Replies:
    11
    Views:
    1,215
    BlueBell
    Apr 14, 2024
  8. David Swingler

    Outdrive to Inboard conversion

    David Swingler, Mar 22, 2024
    Replies:
    9
    Views:
    1,369
    fallguy
    Mar 22, 2024
  9. DCockey

    Yamaha acquires Torqeedo

    DCockey, Jan 19, 2024
    Replies:
    5
    Views:
    2,106
    Paul Scott
    Jan 24, 2024
  10. paticus

    Gear ratio for houseboat

    paticus, Oct 27, 2023
    Replies:
    13
    Views:
    2,483
    gonzo
    Oct 30, 2023
  11. paticus

    Re-powering a houseboat - Stay with Stern drive?

    paticus, Oct 10, 2023 ... 2
    Replies:
    17
    Views:
    2,454
    paticus
    Oct 27, 2023
  12. Guillermo

    New propulsion sytems for ships

    Guillermo, Dec 2, 2005 ... 37 38 39
    Replies:
    579
    Views:
    187,154
    fredrosse
    Oct 8, 2023
  13. MarkOHara

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

    MarkOHara, Jul 4, 2023
    Replies:
    5
    Views:
    1,695
    Rumars
    Jul 5, 2023
  14. naserrishehri

    Power efficiency

    naserrishehri, Jun 7, 2023 ... 2
    Replies:
    16
    Views:
    3,445
    TANSL
    Jun 11, 2023
  15. valter.f

    Twin stern tube propeller with only one engine

    valter.f, May 24, 2023 ... 2
    Replies:
    15
    Views:
    3,086
    valter.f
    Jun 1, 2023
  16. Flat bottom girl

    Large hp outboard on a tri

    Flat bottom girl, Mar 12, 2023
    Replies:
    2
    Views:
    1,692
    Paul Scott
    May 14, 2023
  17. Forecaddie

    Outboard sail drive

    Forecaddie, May 11, 2023
    Replies:
    8
    Views:
    1,278
    Forecaddie
    May 14, 2023
  18. BigMuddy

    Sternwheeler Power Requirements

    BigMuddy, Jan 17, 2022 ... 2
    Replies:
    22
    Views:
    5,842
    Spokart
    Apr 20, 2023
  19. rivergybsy

    Air boat for flood emergency

    rivergybsy, Jan 28, 2023
    Replies:
    3
    Views:
    1,584
    portacruise
    Jan 30, 2023
  20. TheyCallMeTrinity

    15 foot Aluminum Boat with Z482 Kubota

    TheyCallMeTrinity, Oct 12, 2022 ... 2
    Replies:
    28
    Views:
    5,639
    TheyCallMeTrinity
    Jan 2, 2023
  21. Andy58

    RPM to Speed

    Andy58, Oct 16, 2022
    Replies:
    9
    Views:
    1,782
    Andy58
    Oct 18, 2022
  22. telak

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

    telak, Jun 29, 2022 ... 2
    Replies:
    17
    Views:
    3,765
    telak
    Aug 9, 2022
  23. mackid068

    Favorite Type of Power for a Powerboat

    mackid068, Jun 27, 2005 ... 2 3
    Replies:
    38
    Views:
    11,959
    BlueBell
    Jul 28, 2022
  24. emrecantasdemir

    Dual - Fuel marine engines

    emrecantasdemir, Jun 3, 2022
    Replies:
    6
    Views:
    1,508
    baeckmo
    Jun 4, 2022
  25. DogCavalry

    Power to Weight Ratio

    DogCavalry, Apr 16, 2022
    Replies:
    9
    Views:
    1,945
    jehardiman
    Apr 17, 2022
  26. Ruffner Sedurifa

    Propeller Puller

    Ruffner Sedurifa, Mar 29, 2022
    Replies:
    10
    Views:
    1,947
    Ruffner Sedurifa
    Apr 3, 2022
  27. Kirk

    How to make a pedal powered prop.

    Kirk, Feb 24, 2022 ... 2
    Replies:
    15
    Views:
    9,575
    Kirk
    Feb 28, 2022
  28. DCockey

    Mercury 175 HP Outboard Diesel Fuel Spark Ignition

    DCockey, Feb 2, 2022
    Replies:
    4
    Views:
    2,603
    DogCavalry
    Feb 4, 2022
  29. captdon65

    prop pocket/tunnel problem solutions

    captdon65, Nov 28, 2016
    Replies:
    10
    Views:
    5,920
    Mike Goebel
    Jan 24, 2022
  30. alby joy

    Engine not reaching Rated RPM during gearbox engaged

    alby joy, Sep 2, 2021
    Replies:
    11
    Views:
    3,483
    comfisherman
    Nov 9, 2021
  31. LePrince

    Tug Bullard Pull Calculations

    LePrince, Oct 24, 2021
    Replies:
    6
    Views:
    2,015
    LePrince
    Oct 29, 2021
  32. Guest625101138

    DDWFTTW - Directly Downwind Faster Than The Wind

    Guest625101138, Jan 4, 2009 ... 38 39 40
    Replies:
    588
    Views:
    135,785
    gonzo
    Oct 4, 2021
  33. Rasmith

    Bio Inspired Propulsion

    Rasmith, Aug 28, 2021
    Replies:
    7
    Views:
    2,787
    Rasmith
    Sep 30, 2021
  34. HeyK20

    How are Thai Long Tail Boats Cooled?

    HeyK20, Jun 22, 2021
    Replies:
    3
    Views:
    2,515
    gonzo
    Aug 27, 2021
  35. yipster

    dual prop shaft ?

    yipster, Oct 30, 2002 ... 2 3
    Replies:
    34
    Views:
    41,632
    Christian Lucas
    May 17, 2021
  36. NikRitz

    Kayak motor

    NikRitz, Apr 22, 2020 ... 2
    Replies:
    23
    Views:
    6,487
    SolGato
    Apr 26, 2021
  37. tom kane

    Define what a Surface-Piercing propeller is

    tom kane, Jul 12, 2009 ... 13 14 15
    Replies:
    212
    Views:
    80,076
    tom kane
    Feb 18, 2021
  38. boat3630

    Test borg warner transmissions

    boat3630, Dec 31, 2020
    Replies:
    9
    Views:
    3,097
    gonzo
    Jan 3, 2021
  39. marufuddin0

    3D Propeller Design

    marufuddin0, Dec 13, 2020
    Replies:
    7
    Views:
    3,839
    Heimfried
    Dec 21, 2020
  40. aybabtme

    Fuel system plumbing (diesel)

    aybabtme, May 30, 2020
    Replies:
    4
    Views:
    2,111
    Jeremey Stadnik
    Dec 8, 2020
Showing threads 1 to 40 of 982

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