Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    543
    Messages:
    6,436
    Latest: Seeking Input for DIY Propeller Cleaning Tool – Master's Thesis Research Survey gonzo, Apr 29, 2025
    RSS

  2. Surface Drives

    Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
    Discussions:
    186
    Messages:
    2,864
    Latest: Is Levi Drives still in business? BlueBell, May 30, 2025
    RSS

  3. Jet Drives

    Jet Drives (pumps, impellers, etc.)
    Discussions:
    463
    Messages:
    4,452
    Latest: drive for landing craft used on both ocean and rivers DogCavalry, Feb 10, 2025
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,044
    Messages:
    10,061
    Latest: OXE Diesel Outboard Experiences? comfisherman, Jun 2, 2025
    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:
    540
    Messages:
    5,009
    Latest: Velvet Drive CR2 drop center gear. Carteret, Jun 21, 2025
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    691
    Messages:
    8,624
    Latest: 38' 1984 posillipo technema with Fiat Iveco diesel engines question comfisherman, Jun 6, 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:
    2,119
    Latest: Sizing a propeller to match an electric motor gonzo, Jun 10, 2025
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,275
    Latest: Hydraulic Drive for max efficiency Rumars, May 6, 2025
    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 4 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. M&M Ovenden

    axial vs centrifugal blowers

    M&M Ovenden, Aug 1, 2016
    Replies:
    5
    Views:
    2,963
    FAST FRED
    Aug 2, 2016
  2. black_sails

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

    black_sails, May 10, 2016
    Replies:
    8
    Views:
    16,744
    Ad Hoc
    May 10, 2016
  3. chowdan

    Repowering Bristol 27

    chowdan, May 5, 2016
    Replies:
    3
    Views:
    2,951
    FAST FRED
    May 10, 2016
  4. Barry

    New engine design

    Barry, Apr 30, 2016
    Replies:
    1
    Views:
    3,197
    sdowney717
    Apr 30, 2016
  5. mahdin

    fuel vent

    mahdin, Apr 13, 2016
    Replies:
    3
    Views:
    3,577
    TANSL
    Apr 15, 2016
  6. sdowney717

    Fuel tank valve delete?

    sdowney717, Apr 13, 2016
    Replies:
    5
    Views:
    3,304
    Barry
    Apr 13, 2016
  7. Ike

    Mercruiser sterndrive Zinc Chromate

    Ike, Apr 12, 2016
    Replies:
    5
    Views:
    5,102
    gonzo
    Apr 13, 2016
  8. Hunterr

    what is the bobtail of engine?

    Hunterr, Apr 10, 2016
    Replies:
    2
    Views:
    13,255
    JSL
    Apr 10, 2016
  9. Brian.Lin

    dual main engine a single output

    Brian.Lin, Mar 30, 2016 ... 2
    Replies:
    16
    Views:
    5,821
    powerabout
    Apr 2, 2016
  10. tom kane

    Better than a Pocket or Tunnel?

    tom kane, Jan 10, 2016
    Replies:
    6
    Views:
    4,006
    tom kane
    Mar 20, 2016
  11. AnthonyW

    Flapping fin propellor - University of Oxford

    AnthonyW, Sep 8, 2015
    Replies:
    14
    Views:
    7,492
    Rastapop
    Mar 16, 2016
  12. Danob

    Corrisionx vs CRC

    Danob, Feb 21, 2016
    Replies:
    2
    Views:
    4,339
    Danob
    Mar 7, 2016
  13. liam@liamcurtin

    pump piston powered boat

    liam@liamcurtin, Feb 11, 2016 ... 2 3
    Replies:
    36
    Views:
    8,127
    Steve W
    Feb 19, 2016
  14. Danob

    Fuel additives

    Danob, Dec 31, 2015 ... 2
    Replies:
    22
    Views:
    7,130
    whitepointer23
    Jan 3, 2016
  15. jtrott

    inboard to outboard convert houseboat

    jtrott, Dec 20, 2012
    Replies:
    7
    Views:
    10,435
    gonzo
    Dec 23, 2015
  16. rich99uk

    CV Joints replacment on Python Drive

    rich99uk, Dec 23, 2015
    Replies:
    0
    Views:
    3,364
    rich99uk
    Dec 23, 2015
  17. Leverage41

    Repowering 1952 18' Palmer Scott

    Leverage41, Dec 16, 2015
    Replies:
    0
    Views:
    3,147
    Leverage41
    Dec 16, 2015
  18. tom kane

    Conytrapel Propulsion

    tom kane, Nov 9, 2015 ... 2
    Replies:
    18
    Views:
    7,119
    tom kane
    Nov 17, 2015
  19. tinpin4544

    Trolling motor issues/question

    tinpin4544, Nov 9, 2015
    Replies:
    7
    Views:
    3,889
    lance linked
    Nov 13, 2015
  20. charlief1

    DIY human powered drive and prop design

    charlief1, Oct 1, 2015 ... 2
    Replies:
    22
    Views:
    21,311
    charlief1
    Oct 16, 2015
  21. ssawasare

    cantilever beam method

    ssawasare, Oct 14, 2015
    Replies:
    0
    Views:
    2,683
    ssawasare
    Oct 14, 2015
  22. suprathepeg

    Outboard or Jet Ski power?

    suprathepeg, Oct 10, 2015
    Replies:
    4
    Views:
    5,310
    suprathepeg
    Oct 12, 2015
  23. stonedpirate

    Inboard outboard?

    stonedpirate, Sep 6, 2015 ... 2
    Replies:
    29
    Views:
    6,654
    Rurudyne
    Sep 8, 2015
  24. marsh trapper

    technodrive tmc 60 gearbox fluid check.?

    marsh trapper, Aug 26, 2015
    Replies:
    1
    Views:
    3,394
    CDK
    Aug 27, 2015
  25. Darien

    Tropical flooding rivers... please help me.

    Darien, Aug 14, 2015 ... 2
    Replies:
    29
    Views:
    6,742
    Darien
    Aug 17, 2015
  26. Edolyi

    Propulsive efficiency and propeller depth relationship

    Edolyi, Jul 25, 2015
    Replies:
    9
    Views:
    6,975
    Edolyi
    Jul 26, 2015
  27. xxdroom

    paddlewheeler recuction drive

    xxdroom, Oct 30, 2014 ... 5 6 7
    Replies:
    104
    Views:
    22,992
    JSL
    Jul 11, 2015
  28. brian eiland

    Fuel from Seawater

    brian eiland, Apr 10, 2014
    Replies:
    5
    Views:
    4,587
    brian eiland
    Jul 3, 2015
  29. NAVMAR

    foundation metal chocks-[weld liners,shims]

    NAVMAR, Jun 19, 2015
    Replies:
    0
    Views:
    4,416
    NAVMAR
    Jun 19, 2015
  30. Hotz

    Baffled - grey/milky oil

    Hotz, Jun 4, 2015
    Replies:
    11
    Views:
    6,288
    Hotz
    Jun 7, 2015
  31. YotaTruck

    Electric outboard for 20' x 6' flat bottom skiff?

    YotaTruck, May 24, 2015
    Replies:
    2
    Views:
    3,565
    Jamie Kennedy
    Jun 3, 2015
  32. Tiny Turnip

    Electric ferry in operation

    Tiny Turnip, May 21, 2015
    Replies:
    0
    Views:
    3,324
    Tiny Turnip
    May 21, 2015
  33. srinath88

    torpedo propulsion

    srinath88, May 20, 2015
    Replies:
    10
    Views:
    6,115
    gonzo
    May 21, 2015
  34. boarding bob

    Wind Turbine Boat

    boarding bob, May 20, 2015
    Replies:
    4
    Views:
    4,206
    boarding bob
    May 21, 2015
  35. alexrmc92

    First Real DIY Boat - Tiny Might

    alexrmc92, Aug 20, 2013
    Replies:
    2
    Views:
    4,369
    JakubT
    Mar 28, 2015
  36. mlopez0519

    Propeller Hub question

    mlopez0519, Mar 22, 2015
    Replies:
    7
    Views:
    3,579
    mlopez0519
    Mar 23, 2015
  37. Tupiniquim

    Reliable 200Hp engine and gearbox

    Tupiniquim, Mar 17, 2015
    Replies:
    3
    Views:
    4,674
    FAST FRED
    Mar 18, 2015
  38. Boucaneer

    Small electric paddle wheel for a open motor canoe. Some advise needed please.

    Boucaneer, Mar 15, 2015
    Replies:
    4
    Views:
    5,346
    Boucaneer
    Mar 15, 2015
  39. lifes2short

    DAF marine engines

    lifes2short, Mar 5, 2015
    Replies:
    2
    Views:
    4,849
    whitepointer23
    Mar 5, 2015
  40. sdowney717

    Self draining heat exchangers?

    sdowney717, Feb 27, 2015
    Replies:
    14
    Views:
    4,597
    sdowney717
    Mar 5, 2015
Showing threads 121 to 160 of 985

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