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
    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:
    2,095
    Latest: More problems with wet lithium ion batteries - Port of Miami fire philSweet, Jan 19, 2025 at 8:39 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 3 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. DSTONE

    OMC-Ford 2.3 trouble

    DSTONE, Aug 9, 2005
    Replies:
    4
    Views:
    13,594
    Israel
    May 26, 2018
  2. Tlray

    Water in the cylinders 4.3

    Tlray, May 19, 2018 ... 2
    Replies:
    15
    Views:
    11,905
    PAR
    May 22, 2018
  3. Upston

    Transmission ratios

    Upston, May 16, 2018
    Replies:
    2
    Views:
    2,042
    Upston
    May 21, 2018
  4. franklou

    motor and waterjet model

    franklou, Apr 17, 2018
    Replies:
    7
    Views:
    3,093
    franklou
    Apr 18, 2018
  5. PickleRick

    A little boat and a simple diesel project

    PickleRick, Dec 4, 2017
    Replies:
    5
    Views:
    2,797
    gonzo
    Mar 12, 2018
  6. xellz

    Saildrive or shaft with electric motor

    xellz, Feb 10, 2018
    Replies:
    2
    Views:
    4,308
    xellz
    Feb 11, 2018
  7. Singleinboard

    1973 Silverton Replace V Drive

    Singleinboard, Jan 8, 2018
    Replies:
    3
    Views:
    4,046
    PAR
    Jan 9, 2018
  8. 91SARATH

    Propeller design

    91SARATH, Dec 14, 2017 ... 2
    Replies:
    27
    Views:
    7,905
    gonzo
    Dec 19, 2017
  9. Archangl7

    electric motor outboard conversion

    Archangl7, Aug 5, 2017 ... 2
    Replies:
    16
    Views:
    11,266
    HMLee
    Dec 1, 2017
  10. xellz

    Advice on shaft, seal, bearings for wooden kayak

    xellz, Nov 26, 2017
    Replies:
    8
    Views:
    3,698
    xellz
    Nov 29, 2017
  11. Carter Beall

    electric hydrofoil

    Carter Beall, Jun 27, 2016
    Replies:
    10
    Views:
    6,759
    Ian Brown
    Aug 21, 2017
  12. kschung

    propulsion of kort nozzle

    kschung, Aug 10, 2004
    Replies:
    11
    Views:
    11,506
    Barry
    Aug 13, 2017
  13. Leveboat

    reverberation on pontoon?

    Leveboat, Apr 23, 2017 ... 2
    Replies:
    16
    Views:
    3,829
    ondarvr
    Apr 25, 2017
  14. ATMHC

    "Duo-Prop" Inboard Transmission ????

    ATMHC, Jun 26, 2007
    Replies:
    8
    Views:
    6,279
    brian eiland
    Apr 23, 2017
  15. Angle X

    GM 3.6 motor in boat?

    Angle X, Apr 23, 2017
    Replies:
    0
    Views:
    3,038
    Angle X
    Apr 23, 2017
  16. valvebounce

    jack plates and steering connection.

    valvebounce, Apr 17, 2017
    Replies:
    2
    Views:
    2,440
    valvebounce
    Apr 18, 2017
  17. Squidly-Diddly

    homebrew and bottling of hydrogen gas with scuba compressor?

    Squidly-Diddly, Apr 9, 2017
    Replies:
    7
    Views:
    2,972
    Stumble
    Apr 10, 2017
  18. mitchellleary

    Advice on the correct power rating for my Autonomous boat

    mitchellleary, Mar 30, 2017 ... 2
    Replies:
    20
    Views:
    4,526
    daiquiri
    Apr 7, 2017
  19. Liopleurodon

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

    Liopleurodon, Mar 16, 2017
    Replies:
    7
    Views:
    5,793
    Liopleurodon
    Mar 23, 2017
  20. DCockey

    Short Shaft / Surface Drive / Mud Motors

    DCockey, Mar 20, 2017
    Replies:
    1
    Views:
    4,930
    tom kane
    Mar 20, 2017
  21. 1J1

    Magnus effect for ship propulsion

    1J1, Mar 6, 2017 ... 2 3
    Replies:
    36
    Views:
    12,537
    Ilan Voyager
    Mar 14, 2017
  22. Random_user

    Used hydra-drive

    Random_user, Mar 6, 2017
    Replies:
    2
    Views:
    2,810
    Random_user
    Mar 6, 2017
  23. brian eiland

    U-joint, CV-joint, Thompson coupling

    brian eiland, Mar 16, 2007 ... 2 3
    Replies:
    37
    Views:
    26,293
    Angle X
    Mar 4, 2017
  24. bcobbett

    1995 Seadoo HX - Stalls at high speed

    bcobbett, Dec 10, 2016
    Replies:
    3
    Views:
    2,534
    Random_user
    Mar 3, 2017
  25. Timetogo

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

    Timetogo, Feb 27, 2017
    Replies:
    2
    Views:
    3,499
    sailhand
    Feb 28, 2017
  26. dwicejama

    voith scheider construction

    dwicejama, Feb 22, 2017
    Replies:
    0
    Views:
    2,598
    dwicejama
    Feb 22, 2017
  27. bluedolfin

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

    bluedolfin, Feb 15, 2017
    Replies:
    9
    Views:
    3,717
    Stumble
    Feb 16, 2017
  28. JasonCatt

    Interesting digital magazines on all things electric....

    JasonCatt, Feb 4, 2017
    Replies:
    1
    Views:
    2,025
    Ike
    Feb 5, 2017
  29. Angle X

    Rim drive propeller? Shaft driven rim drive?

    Angle X, Dec 31, 2016
    Replies:
    0
    Views:
    3,212
    Angle X
    Dec 31, 2016
  30. mtht110

    Propeller dia and shaft rpm

    mtht110, Dec 17, 2016
    Replies:
    4
    Views:
    3,698
    Trojan
    Dec 22, 2016
  31. voodoo92

    Used and abused question. Stern drive vs ob

    voodoo92, Jul 7, 2014
    Replies:
    3
    Views:
    3,696
    mydauphin
    Nov 20, 2016
  32. sdowney717

    Vernatone muffler inline, one louder than the other

    sdowney717, Sep 26, 2016
    Replies:
    2
    Views:
    2,239
    kapnD
    Nov 17, 2016
  33. Danob

    prop shaft packing nut dripping to much

    Danob, Sep 18, 2016
    Replies:
    7
    Views:
    6,073
    kapnD
    Oct 17, 2016
  34. MoeZ

    Question about the jackshaft+sterndrive configuration

    MoeZ, Sep 26, 2016
    Replies:
    3
    Views:
    3,348
    MoeZ
    Sep 26, 2016
  35. ahdblo7

    OMC Shift cable or gear issue??

    ahdblo7, Sep 10, 2016
    Replies:
    2
    Views:
    3,222
    PAR
    Sep 10, 2016
  36. engnr09

    compressed natural gas engine

    engnr09, Jan 16, 2011 ... 2
    Replies:
    15
    Views:
    13,029
    FAST FRED
    Aug 17, 2016
  37. siewertdesign

    Python Drive bushings

    siewertdesign, Aug 1, 2016
    Replies:
    4
    Views:
    2,691
    siewertdesign
    Aug 3, 2016
  38. M&M Ovenden

    axial vs centrifugal blowers

    M&M Ovenden, Aug 1, 2016
    Replies:
    5
    Views:
    2,622
    FAST FRED
    Aug 2, 2016
  39. black_sails

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

    black_sails, May 10, 2016
    Replies:
    8
    Views:
    15,498
    Ad Hoc
    May 10, 2016
  40. chowdan

    Repowering Bristol 27

    chowdan, May 5, 2016
    Replies:
    3
    Views:
    2,653
    FAST FRED
    May 10, 2016
Showing threads 81 to 120 of 982

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