Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    533
    Messages:
    6,251
    Latest: Tunnel drive propeller selection HotJava66, Apr 15, 2024 at 6:49 PM
    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:
    459
    Messages:
    4,429
    Latest: Marathon Jet Needs Engine? Cody Symonds, Feb 6, 2024
    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 3 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. xellz

    Saildrive or shaft with electric motor

    xellz, Feb 10, 2018
    Replies:
    2
    Views:
    3,885
    xellz
    Feb 11, 2018
  2. Singleinboard

    1973 Silverton Replace V Drive

    Singleinboard, Jan 8, 2018
    Replies:
    3
    Views:
    3,631
    PAR
    Jan 9, 2018
  3. 91SARATH

    Propeller design

    91SARATH, Dec 14, 2017 ... 2
    Replies:
    27
    Views:
    6,996
    gonzo
    Dec 19, 2017
  4. Archangl7

    electric motor outboard conversion

    Archangl7, Aug 5, 2017 ... 2
    Replies:
    16
    Views:
    10,419
    HMLee
    Dec 1, 2017
  5. xellz

    Advice on shaft, seal, bearings for wooden kayak

    xellz, Nov 26, 2017
    Replies:
    8
    Views:
    3,232
    xellz
    Nov 29, 2017
  6. Carter Beall

    electric hydrofoil

    Carter Beall, Jun 27, 2016
    Replies:
    10
    Views:
    6,159
    Ian Brown
    Aug 21, 2017
  7. kschung

    propulsion of kort nozzle

    kschung, Aug 10, 2004
    Replies:
    11
    Views:
    10,894
    Barry
    Aug 13, 2017
  8. Leveboat

    reverberation on pontoon?

    Leveboat, Apr 23, 2017 ... 2
    Replies:
    16
    Views:
    3,318
    ondarvr
    Apr 25, 2017
  9. ATMHC

    "Duo-Prop" Inboard Transmission ????

    ATMHC, Jun 26, 2007
    Replies:
    8
    Views:
    5,965
    brian eiland
    Apr 23, 2017
  10. Angle X

    GM 3.6 motor in boat?

    Angle X, Apr 23, 2017
    Replies:
    0
    Views:
    2,688
    Angle X
    Apr 23, 2017
  11. valvebounce

    jack plates and steering connection.

    valvebounce, Apr 17, 2017
    Replies:
    2
    Views:
    2,191
    valvebounce
    Apr 18, 2017
  12. Squidly-Diddly

    homebrew and bottling of hydrogen gas with scuba compressor?

    Squidly-Diddly, Apr 9, 2017
    Replies:
    7
    Views:
    2,561
    Stumble
    Apr 10, 2017
  13. mitchellleary

    Advice on the correct power rating for my Autonomous boat

    mitchellleary, Mar 30, 2017 ... 2
    Replies:
    20
    Views:
    3,873
    daiquiri
    Apr 7, 2017
  14. Liopleurodon

    Jet drive, tunnel, or tunnel outboard for low HP low draft

    Liopleurodon, Mar 16, 2017
    Replies:
    7
    Views:
    4,952
    Liopleurodon
    Mar 23, 2017
  15. DCockey

    Short Shaft / Surface Drive / Mud Motors

    DCockey, Mar 20, 2017
    Replies:
    1
    Views:
    4,427
    tom kane
    Mar 20, 2017
  16. 1J1

    Magnus effect for ship propulsion

    1J1, Mar 6, 2017 ... 2 3
    Replies:
    36
    Views:
    11,080
    Ilan Voyager
    Mar 14, 2017
  17. Random_user

    Used hydra-drive

    Random_user, Mar 6, 2017
    Replies:
    2
    Views:
    2,487
    Random_user
    Mar 6, 2017
  18. brian eiland

    U-joint, CV-joint, Thompson coupling

    brian eiland, Mar 16, 2007 ... 2 3
    Replies:
    37
    Views:
    25,045
    Angle X
    Mar 4, 2017
  19. bcobbett

    1995 Seadoo HX - Stalls at high speed

    bcobbett, Dec 10, 2016
    Replies:
    3
    Views:
    2,245
    Random_user
    Mar 3, 2017
  20. Timetogo

    Putting this out there for discussion (livaboard river boat propulsion)

    Timetogo, Feb 27, 2017
    Replies:
    2
    Views:
    3,211
    sailhand
    Feb 28, 2017
  21. dwicejama

    voith scheider construction

    dwicejama, Feb 22, 2017
    Replies:
    0
    Views:
    2,411
    dwicejama
    Feb 22, 2017
  22. bluedolfin

    Repower 34' yacht with diesel AC gen-set & VFD

    bluedolfin, Feb 15, 2017
    Replies:
    9
    Views:
    3,282
    Stumble
    Feb 16, 2017
  23. JasonCatt

    Interesting digital magazines on all things electric....

    JasonCatt, Feb 4, 2017
    Replies:
    1
    Views:
    1,796
    Ike
    Feb 5, 2017
  24. Angle X

    Rim drive propeller? Shaft driven rim drive?

    Angle X, Dec 31, 2016
    Replies:
    0
    Views:
    2,849
    Angle X
    Dec 31, 2016
  25. mtht110

    Propeller dia and shaft rpm

    mtht110, Dec 17, 2016
    Replies:
    4
    Views:
    3,349
    Trojan
    Dec 22, 2016
  26. voodoo92

    Used and abused question. Stern drive vs ob

    voodoo92, Jul 7, 2014
    Replies:
    3
    Views:
    3,410
    mydauphin
    Nov 20, 2016
  27. sdowney717

    Vernatone muffler inline, one louder than the other

    sdowney717, Sep 26, 2016
    Replies:
    2
    Views:
    2,006
    kapnD
    Nov 17, 2016
  28. Danob

    prop shaft packing nut dripping to much

    Danob, Sep 18, 2016
    Replies:
    7
    Views:
    5,597
    kapnD
    Oct 17, 2016
  29. MoeZ

    Question about the jackshaft+sterndrive configuration

    MoeZ, Sep 26, 2016
    Replies:
    3
    Views:
    3,003
    MoeZ
    Sep 26, 2016
  30. ahdblo7

    OMC Shift cable or gear issue??

    ahdblo7, Sep 10, 2016
    Replies:
    2
    Views:
    2,874
    PAR
    Sep 10, 2016
  31. engnr09

    compressed natural gas engine

    engnr09, Jan 16, 2011 ... 2
    Replies:
    15
    Views:
    12,114
    FAST FRED
    Aug 17, 2016
  32. siewertdesign

    Python Drive bushings

    siewertdesign, Aug 1, 2016
    Replies:
    4
    Views:
    2,419
    siewertdesign
    Aug 3, 2016
  33. M&M Ovenden

    axial vs centrifugal blowers

    M&M Ovenden, Aug 1, 2016
    Replies:
    5
    Views:
    2,275
    FAST FRED
    Aug 2, 2016
  34. black_sails

    Speed/efficiency at various kts - prop, surface drive, jet, etc.

    black_sails, May 10, 2016
    Replies:
    8
    Views:
    14,140
    Ad Hoc
    May 10, 2016
  35. chowdan

    Repowering Bristol 27

    chowdan, May 5, 2016
    Replies:
    3
    Views:
    2,339
    FAST FRED
    May 10, 2016
  36. Barry

    New engine design

    Barry, Apr 30, 2016
    Replies:
    1
    Views:
    2,617
    sdowney717
    Apr 30, 2016
  37. mahdin

    fuel vent

    mahdin, Apr 13, 2016
    Replies:
    3
    Views:
    2,928
    TANSL
    Apr 15, 2016
  38. sdowney717

    Fuel tank valve delete?

    sdowney717, Apr 13, 2016
    Replies:
    5
    Views:
    2,678
    Barry
    Apr 13, 2016
  39. Ike

    Mercruiser sterndrive Zinc Chromate

    Ike, Apr 12, 2016
    Replies:
    5
    Views:
    4,159
    gonzo
    Apr 13, 2016
  40. Hunterr

    what is the bobtail of engine?

    Hunterr, Apr 10, 2016
    Replies:
    2
    Views:
    11,386
    JSL
    Apr 10, 2016
Showing threads 81 to 120 of 977

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