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 5 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. safaounaghi

    Improving ship speed

    safaounaghi, Feb 15, 2015 ... 2
    Replies:
    17
    Views:
    5,587
    PAR
    Feb 18, 2015
  2. Paulc

    Wave propulsion

    Paulc, May 26, 2014 ... 2
    Replies:
    15
    Views:
    7,851
    kjell
    Jan 22, 2015
  3. Wahyuyohidayat

    Integrated Tug Barge

    Wahyuyohidayat, Jan 13, 2015
    Replies:
    0
    Views:
    2,826
    Wahyuyohidayat
    Jan 13, 2015
  4. fredrosse

    Steam Paddlewheel Boat

    fredrosse, Jan 25, 2005 ... 2
    Replies:
    24
    Views:
    34,621
    phrogjlf@yahoo
    Dec 17, 2014
  5. stonedpirate

    My outboard is spraying water at me

    stonedpirate, Nov 21, 2014 ... 2 3 4
    Replies:
    47
    Views:
    28,625
    WestVanHan
    Nov 24, 2014
  6. Arviya

    Wake Distribution

    Arviya, Nov 20, 2014
    Replies:
    3
    Views:
    3,573
    jehardiman
    Nov 21, 2014
  7. bam_yat

    engine room ventilation

    bam_yat, Nov 10, 2014
    Replies:
    11
    Views:
    15,031
    PAR
    Nov 11, 2014
  8. rwatson

    Huge slow two stroke Piston Engines in LNG commercial ships

    rwatson, Sep 16, 2014
    Replies:
    5
    Views:
    5,614
    rwatson
    Sep 18, 2014
  9. Ol Gillnetter

    Keel Modification

    Ol Gillnetter, Jan 24, 2013 ... 2 3 4
    Replies:
    59
    Views:
    16,141
    Ol Gillnetter
    Aug 22, 2014
  10. Mr_CVT

    CVT transmission design by BitRaptor working only with spokets -high efficiency

    Mr_CVT, Jun 25, 2014
    Replies:
    6
    Views:
    6,537
    NoahWannabe
    Jun 28, 2014
  11. Paulc

    Compressed air battery/propulsion

    Paulc, Jun 15, 2014
    Replies:
    9
    Views:
    4,464
    Stumble
    Jun 18, 2014
  12. shuller1458

    Solar powered pontoon, question.

    shuller1458, May 29, 2014
    Replies:
    11
    Views:
    3,816
    Grey Ghost
    Jun 15, 2014
  13. rubenova

    Does anyone own a Yanmar Saildrive?

    rubenova, Jun 13, 2014
    Replies:
    2
    Views:
    3,098
    rubenova
    Jun 14, 2014
  14. ssawasare

    Blade material

    ssawasare, Jun 6, 2014
    Replies:
    1
    Views:
    2,427
    jehardiman
    Jun 6, 2014
  15. Ike

    Analyze This!

    Ike, May 30, 2014 ... 2
    Replies:
    17
    Views:
    4,475
    Petros
    Jun 2, 2014
  16. saltnz

    Alternatives in outboards

    saltnz, May 28, 2014
    Replies:
    9
    Views:
    3,668
    PAR
    Jun 1, 2014
  17. parkland

    Steam power

    parkland, Nov 6, 2013 ... 2 3
    Replies:
    39
    Views:
    9,338
    SamSam
    May 31, 2014
  18. nine mile

    Do hydrofoils work?

    nine mile, May 11, 2014
    Replies:
    6
    Views:
    3,404
    daiquiri
    May 14, 2014
  19. Kema

    Engine for 30 foot old and heavy ex fishing boat

    Kema, May 5, 2014
    Replies:
    5
    Views:
    3,690
    FAST FRED
    May 7, 2014
  20. Crocodile69

    An odd fix...

    Crocodile69, Apr 25, 2014
    Replies:
    6
    Views:
    3,463
    Crocodile69
    Apr 27, 2014
  21. MrLknowles2

    Homemade Outboard (Electric) - Help!

    MrLknowles2, Jul 26, 2012
    Replies:
    14
    Views:
    97,499
    boatindad
    Apr 25, 2014
  22. captainart

    Blackfin transom mounted rudders

    captainart, Apr 21, 2014
    Replies:
    0
    Views:
    6,054
    captainart
    Apr 21, 2014
  23. brian eiland

    Gas from Water, (WaterFuel), HHO technology

    brian eiland, May 15, 2006 ... 17 18 19
    Replies:
    278
    Views:
    80,972
    masrapido
    Apr 2, 2014
  24. lausl

    compact propulsion unit

    lausl, Mar 24, 2014
    Replies:
    6
    Views:
    3,616
    FAST FRED
    Mar 28, 2014
  25. QUICKNAVAL

    Propeller shaft and propeller diameter

    QUICKNAVAL, Mar 19, 2014
    Replies:
    6
    Views:
    17,259
    QUICKNAVAL
    Mar 22, 2014
  26. ssawasare

    safety factor for propeller in bollard astern condition

    ssawasare, Feb 20, 2014
    Replies:
    1
    Views:
    2,958
    jehardiman
    Feb 20, 2014
  27. mabdulhaq

    ASD vs conventional FPP propeller and rudders for 50+m AHTS tugboat

    mabdulhaq, Sep 23, 2010 ... 2
    Replies:
    28
    Views:
    16,663
    Michael23
    Feb 16, 2014
  28. Jet_Love

    4 Stroke Cleaner Than 2, Really?

    Jet_Love, Jun 17, 2013 ... 3 4 5
    Replies:
    60
    Views:
    14,061
    FAST FRED
    Feb 11, 2014
  29. SuenosAzules

    Thermal Imaging on Two Suzuki 115 HP Outboard Engines...

    SuenosAzules, Jan 29, 2014
    Replies:
    5
    Views:
    3,397
    Stumble
    Jan 29, 2014
  30. abohamza

    How can I select optimum boat propulsion system?

    abohamza, Apr 24, 2013
    Replies:
    11
    Views:
    3,981
    DaEdster
    Jan 7, 2014
  31. Saqa

    Looking for an inboard?

    Saqa, Dec 9, 2013
    Replies:
    5
    Views:
    2,990
    powerabout
    Dec 11, 2013
  32. DCockey

    Large Gas Engines - Different Directions

    DCockey, Nov 22, 2013
    Replies:
    8
    Views:
    3,799
    PAR
    Nov 25, 2013
  33. SailorDon

    Steam engine powered 40' cutter?

    SailorDon, Oct 17, 2013
    Replies:
    0
    Views:
    4,127
    SailorDon
    Oct 17, 2013
  34. tom kane

    Tunnel Rudders, Twin Rudders and similar.

    tom kane, Aug 30, 2013
    Replies:
    13
    Views:
    6,736
    tom kane
    Oct 6, 2013
  35. TSN13

    Have omc stringer 800 - should i upgrade to a volvo 280?

    TSN13, Jan 18, 2013
    Replies:
    4
    Views:
    4,298
    BMcF
    Sep 27, 2013
  36. Sundevil

    Most efficient hull design

    Sundevil, Sep 8, 2013
    Replies:
    8
    Views:
    15,749
    philSweet
    Sep 19, 2013
  37. honda600js

    engine swap 2.3 OMC

    honda600js, Aug 7, 2013
    Replies:
    1
    Views:
    4,705
    IMP-ish
    Aug 20, 2013
  38. tom kane

    Big power V8 mud Boat drive.

    tom kane, Aug 14, 2013
    Replies:
    3
    Views:
    6,034
    wildwatson
    Aug 20, 2013
  39. TheCapt

    propulsion for pontoon deck boat

    TheCapt, Jul 28, 2013
    Replies:
    0
    Views:
    2,694
    TheCapt
    Jul 28, 2013
  40. YotaTruck

    Multiple trolling motors for electric only lakes?

    YotaTruck, Jul 22, 2013
    Replies:
    4
    Views:
    13,335
    PAR
    Jul 24, 2013
Showing threads 161 to 200 of 985

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