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 6 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. CatBuilder

    Ganging Outboards - Does it work?

    CatBuilder, Jan 14, 2012 ... 11 12 13
    Replies:
    183
    Views:
    41,203
    DCockey
    Jul 19, 2013
  2. Wayne Kendall

    Universal joints & thrust bearings

    Wayne Kendall, Jun 30, 2013
    Replies:
    4
    Views:
    6,262
    FAST FRED
    Jul 2, 2013
  3. Wayne Kendall

    steady bearing clearance

    Wayne Kendall, Jul 1, 2013
    Replies:
    1
    Views:
    2,779
    daiquiri
    Jul 1, 2013
  4. ThrottleBack

    Trolling motor placement help

    ThrottleBack, Jun 22, 2013
    Replies:
    5
    Views:
    3,375
    PAR
    Jul 1, 2013
  5. lausl

    Recuperation of energy while sailing

    lausl, Oct 4, 2012
    Replies:
    12
    Views:
    4,244
    alan white
    Jun 27, 2013
  6. tom kane

    Very simple motor hook up.

    tom kane, Jun 25, 2013
    Replies:
    7
    Views:
    3,564
    whitepointer23
    Jun 27, 2013
  7. mitul_09

    Dfde

    mitul_09, Jun 21, 2013
    Replies:
    2
    Views:
    2,348
    mitul_09
    Jun 24, 2013
  8. rwatson

    Power Storage in a wobbly flywheel

    rwatson, May 28, 2013
    Replies:
    10
    Views:
    4,155
    gonzo
    May 30, 2013
  9. flipper 15

    Electric power for very small boat

    flipper 15, May 26, 2013
    Replies:
    1
    Views:
    2,928
    CDK
    May 27, 2013
  10. Pond Sailer

    DIY EV kayak discussion on your solution to get more run time with easy to find parts

    Pond Sailer, May 24, 2013
    Replies:
    1
    Views:
    2,889
    Pond Sailer
    May 24, 2013
  11. runwucong

    KT KQ and Eta polynomials for the AU or MAU

    runwucong, May 18, 2013
    Replies:
    0
    Views:
    2,358
    runwucong
    May 18, 2013
  12. Creeky

    Inboard Diesel to CPP via V-Drive - Transmission in forward, thrust in reverse...

    Creeky, Apr 30, 2013
    Replies:
    9
    Views:
    4,563
    Creeky
    May 14, 2013
  13. SixMadrid

    Brainstorming! Suggestions to propel a FRP Trawler

    SixMadrid, Apr 22, 2013 ... 2
    Replies:
    21
    Views:
    5,770
    SixMadrid
    Apr 25, 2013
  14. SailorDon

    Sub-Topic Human Powered

    SailorDon, Apr 8, 2013
    Replies:
    5
    Views:
    3,634
    PAR
    Apr 9, 2013
  15. JosephT

    Paddle wheel thrust

    JosephT, Mar 11, 2013
    Replies:
    5
    Views:
    8,908
    fredrosse
    Apr 6, 2013
  16. tomas

    Battery powered 'ferry of the future' using Rolls-Royce propulsion system

    tomas, Mar 23, 2013
    Replies:
    0
    Views:
    3,010
    tomas
    Mar 23, 2013
  17. majaregielou

    relation of Engine HP to RPM

    majaregielou, Mar 12, 2013
    Replies:
    8
    Views:
    3,369
    gonzo
    Mar 15, 2013
  18. gypsywaters

    Engine anti-sython

    gypsywaters, Mar 3, 2013
    Replies:
    9
    Views:
    3,207
    Landlubber
    Mar 4, 2013
  19. assycat

    jet powered bolger micro trawler?

    assycat, Feb 17, 2013
    Replies:
    1
    Views:
    9,693
    FAST FRED
    Feb 21, 2013
  20. vaderverdi74

    Electric outboard conversion

    vaderverdi74, Feb 20, 2012
    Replies:
    9
    Views:
    11,512
    nevada14
    Feb 3, 2013
  21. MikeJohns

    Smaller vessel thrust bearings.

    MikeJohns, Jan 29, 2013
    Replies:
    14
    Views:
    15,323
    pdwiley
    Feb 1, 2013
  22. pavel915

    Experience with the KaMeWa water jet propulsion system

    pavel915, Feb 1, 2013
    Replies:
    0
    Views:
    3,789
    pavel915
    Feb 1, 2013
  23. tomuchstuff

    bertram 35" mercrusier bmw d219 diesel repower ???????

    tomuchstuff, Oct 5, 2007
    Replies:
    9
    Views:
    7,715
    prowlersfish
    Jan 6, 2013
  24. sundipkumar

    passenger catamaran

    sundipkumar, Dec 6, 2012
    Replies:
    11
    Views:
    5,066
    hoytedow
    Dec 6, 2012
  25. ytquest

    Water Jet Bow Thruster

    ytquest, Nov 25, 2012 ... 2
    Replies:
    29
    Views:
    26,587
    murdomack
    Dec 2, 2012
  26. bassCat

    Pedal Drive

    bassCat, May 5, 2012
    Replies:
    3
    Views:
    7,516
    KDB955
    Nov 8, 2012
  27. swashdrive

    Fin propulsion

    swashdrive, Oct 26, 2012
    Replies:
    3
    Views:
    4,525
    daiquiri
    Oct 27, 2012
  28. joco

    saw this on youtube.

    joco, Aug 18, 2012
    Replies:
    6
    Views:
    3,278
    johneck
    Oct 16, 2012
  29. brian eiland

    in-line 6 Cylinder Engines, 'straight-six'

    brian eiland, Jun 26, 2012 ... 6 7 8
    Replies:
    111
    Views:
    62,480
    Frosty
    Oct 11, 2012
  30. sdowney717

    will a severely barnacled hull prevent engine from reving up to full speed?

    sdowney717, Oct 7, 2012 ... 2
    Replies:
    24
    Views:
    11,909
    jonr
    Oct 10, 2012
  31. drortiz1

    Paddle Wheel Design Project

    drortiz1, Sep 20, 2012 ... 2 3 4
    Replies:
    50
    Views:
    18,273
    Frosty
    Oct 9, 2012
  32. paulfish

    Put a square rigged sail on a W/A??

    paulfish, Sep 19, 2012 ... 2
    Replies:
    15
    Views:
    4,812
    paulfish
    Sep 24, 2012
  33. hydroplanedude

    re powering a 16 foot hydroplane

    hydroplanedude, Sep 15, 2012
    Replies:
    2
    Views:
    2,884
    PAR
    Sep 17, 2012
  34. swashdrive

    Calculating thrust

    swashdrive, Sep 11, 2012
    Replies:
    2
    Views:
    6,352
    ldigas
    Sep 12, 2012
  35. parkland

    Engine bolt patterns and adapters for chevy marine engines

    parkland, Aug 26, 2012
    Replies:
    14
    Views:
    11,423
    FAST FRED
    Sep 4, 2012
  36. Adeyele

    How to determine the RPM of a vessel.

    Adeyele, Sep 3, 2012
    Replies:
    4
    Views:
    7,933
    DCockey
    Sep 3, 2012
  37. jim lee

    Anyone played around with a magnetohydrodynamic drive?

    jim lee, Aug 27, 2012
    Replies:
    14
    Views:
    4,351
    jim lee
    Aug 31, 2012
  38. montyrosevear

    2.9 LTR turbo

    montyrosevear, Aug 22, 2012
    Replies:
    1
    Views:
    2,488
    Frosty
    Aug 22, 2012
  39. Wayne Kendall

    Thrust bearing temperature

    Wayne Kendall, Aug 20, 2012
    Replies:
    3
    Views:
    3,482
    jehardiman
    Aug 20, 2012
  40. tugboat

    anyone seen this new dyson fan- and its potential for marine use?

    tugboat, Jun 24, 2012 ... 2
    Replies:
    24
    Views:
    14,155
    troy2000
    Aug 20, 2012
Showing threads 201 to 240 of 985

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