Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    536
    Messages:
    6,269
    Latest: Thoughts on prop load for com-fish/tow boat comfisherman, Apr 23, 2024 at 2:01 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:
    461
    Messages:
    4,432
    Latest: need intake or picture of for (berk)6jA MALL, Apr 23, 2024 at 11:50 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 2 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. Bradleylarkin

    Best Propulsion system for my boat

    Bradleylarkin, Jul 29, 2020
    Replies:
    7
    Views:
    1,867
    kapnD
    Aug 2, 2020
  2. Silverbreeze

    Diesel Outboards

    Silverbreeze, Jul 4, 2016 ... 2
    Replies:
    29
    Views:
    11,707
    Boatman1011
    Jul 31, 2020
  3. Andre Raath

    marinized 240D running hot

    Andre Raath, May 9, 2020 ... 2
    Replies:
    20
    Views:
    3,517
    sdowney717
    Jul 20, 2020
  4. UNCIVILIZED

    Help with a Repower,maybe with a Hand Crank Diesel?

    UNCIVILIZED, Aug 26, 2014
    Replies:
    13
    Views:
    4,537
    brendan gardam
    Jul 1, 2020
  5. YSS Caribbean

    Daily fuel consumption calculation

    YSS Caribbean, Jun 29, 2020
    Replies:
    7
    Views:
    2,031
    YSS Caribbean
    Jun 30, 2020
  6. JunkRat

    Looking for basic power formulas for electric drive...

    JunkRat, Jan 27, 2019 ... 2
    Replies:
    18
    Views:
    6,381
    Yobarnacle
    May 22, 2020
  7. Bharat Kandpal

    Calculations for designing a propeller?

    Bharat Kandpal, May 1, 2020
    Replies:
    5
    Views:
    1,934
    gonzo
    May 10, 2020
  8. brian eiland

    Retractable Marine Drives

    brian eiland, Aug 3, 2016 ... 2 3
    Replies:
    30
    Views:
    10,958
    brian eiland
    Apr 14, 2020
  9. Barry

    New Propeller Design

    Barry, Apr 2, 2020
    Replies:
    6
    Views:
    2,716
    Barry
    Apr 3, 2020
  10. Vronsky

    Bow thruster installation

    Vronsky, Jan 20, 2020
    Replies:
    10
    Views:
    1,893
    Vronsky
    Jan 21, 2020
  11. IronTom

    JetSki motorcycle engine - Loud and Hot exhaust

    IronTom, Dec 1, 2019
    Replies:
    3
    Views:
    2,335
    ondarvr
    Dec 1, 2019
  12. Victor R

    Flapping Foil

    Victor R, Sep 7, 2019
    Replies:
    3
    Views:
    2,712
    Victor R
    Oct 21, 2019
  13. Adarsh Edakkote

    Pusher tug-barge

    Adarsh Edakkote, Oct 4, 2019
    Replies:
    0
    Views:
    1,739
    Adarsh Edakkote
    Oct 4, 2019
  14. michael smith

    wheel size

    michael smith, Jun 7, 2019
    Replies:
    7
    Views:
    1,961
    jehardiman
    Jun 9, 2019
  15. michael smith

    paddle wheel

    michael smith, May 12, 2019
    Replies:
    6
    Views:
    2,192
    jehardiman
    May 16, 2019
  16. highlandhoh3

    outboard in center of shanty boat

    highlandhoh3, Mar 29, 2019
    Replies:
    9
    Views:
    2,059
    Boat Design Net Moderator
    Mar 29, 2019
  17. brian eiland

    Exciting New EPS Thruster (& Propulsion)

    brian eiland, Nov 16, 2005 ... 4 5 6
    Replies:
    82
    Views:
    101,752
    Kai Rabenstein
    Mar 25, 2019
  18. Dr34m3r

    Article on Waterjet propulsion

    Dr34m3r, Mar 7, 2019
    Replies:
    0
    Views:
    2,120
    Dr34m3r
    Mar 7, 2019
  19. oliver.ilg

    Cable or Chain Ferry

    oliver.ilg, Mar 11, 2015 ... 2
    Replies:
    23
    Views:
    11,377
    Solar Guy
    Mar 2, 2019
  20. Jamesmcl

    Twin outboard prop replacement

    Jamesmcl, Feb 1, 2019
    Replies:
    2
    Views:
    1,948
    Mr Efficiency
    Feb 2, 2019
  21. xellz

    Propulsion general questions for heavy use on 30ft power cat.

    xellz, Dec 29, 2018 ... 2
    Replies:
    24
    Views:
    3,844
    JunkRat
    Jan 27, 2019
  22. Magnus W

    What source for electric energy in a hybrid system?

    Magnus W, Dec 20, 2018 ... 2
    Replies:
    23
    Views:
    3,658
    Christian Lucas
    Jan 25, 2019
  23. Pceditorpro

    Buying or Building a Z Drive?

    Pceditorpro, Dec 3, 2018
    Replies:
    11
    Views:
    3,487
    xrudi
    Jan 12, 2019
  24. Barry

    Low speed trolling with large Horsepower Motors

    Barry, Jan 9, 2019
    Replies:
    5
    Views:
    2,790
    tpenfield
    Jan 11, 2019
  25. captainralph

    DIY Gas Sep Combo

    captainralph, Dec 23, 2018
    Replies:
    2
    Views:
    1,631
    captainralph
    Dec 24, 2018
  26. Brian.Lin

    tug boat engine mounts design (rigid? or flexible?)

    Brian.Lin, Nov 16, 2018
    Replies:
    13
    Views:
    2,783
    Ad Hoc
    Nov 20, 2018
  27. Afilimon

    How to select motors for catamaran?

    Afilimon, Nov 4, 2018 ... 2
    Replies:
    16
    Views:
    3,821
    gonzo
    Nov 8, 2018
  28. DCockey

    Raw seawater as only fuel claim

    DCockey, Sep 28, 2018
    Replies:
    8
    Views:
    2,346
    Blueknarr
    Sep 29, 2018
  29. Archangl7

    electric golf cart inboard design, need help!

    Archangl7, Sep 4, 2018
    Replies:
    7
    Views:
    3,615
    Archangl7
    Sep 13, 2018
  30. ocean dreamer

    Yachting propulsion systems

    ocean dreamer, Sep 2, 2018
    Replies:
    4
    Views:
    1,893
    JamesG123
    Sep 2, 2018
  31. crwsound

    Velvet Drive: How to Separate Reduction Housing from Gearbox?

    crwsound, Aug 5, 2018
    Replies:
    9
    Views:
    5,266
    MikeJohns
    Aug 7, 2018
  32. James007

    convert inboard to outboard

    James007, Nov 20, 2008
    Replies:
    6
    Views:
    9,236
    Butch
    Jul 11, 2018
  33. sdowney717

    Jabsco 4528 impeller pin, does it push or thread in

    sdowney717, Jul 3, 2018
    Replies:
    2
    Views:
    1,520
    sdowney717
    Jul 7, 2018
  34. 5teve

    Muffler Drains

    5teve, Mar 7, 2018
    Replies:
    9
    Views:
    2,632
    5teve
    Jun 25, 2018
  35. Israel

    Bayliner 2.3 turbo

    Israel, May 26, 2018
    Replies:
    10
    Views:
    2,680
    Israel
    May 30, 2018
  36. DSTONE

    OMC-Ford 2.3 trouble

    DSTONE, Aug 9, 2005
    Replies:
    4
    Views:
    13,175
    Israel
    May 26, 2018
  37. Tlray

    Water in the cylinders 4.3

    Tlray, May 19, 2018 ... 2
    Replies:
    15
    Views:
    10,543
    PAR
    May 22, 2018
  38. Upston

    Transmission ratios

    Upston, May 16, 2018
    Replies:
    2
    Views:
    1,821
    Upston
    May 21, 2018
  39. franklou

    motor and waterjet model

    franklou, Apr 17, 2018
    Replies:
    7
    Views:
    2,691
    franklou
    Apr 18, 2018
  40. PickleRick

    A little boat and a simple diesel project

    PickleRick, Dec 4, 2017
    Replies:
    5
    Views:
    2,508
    gonzo
    Mar 12, 2018
Showing threads 41 to 80 of 977

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