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:
    2,094
    Latest: In which way are diagrams for BL DC motors derived (and to understand)? Heimfried, Jan 15, 2025 at 1:40 AM
    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 5 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. fredrosse

    Steam Paddlewheel Boat

    fredrosse, Jan 25, 2005 ... 2
    Replies:
    24
    Views:
    33,601
    phrogjlf@yahoo
    Dec 17, 2014
  2. stonedpirate

    My outboard is spraying water at me

    stonedpirate, Nov 21, 2014 ... 2 3 4
    Replies:
    47
    Views:
    27,588
    WestVanHan
    Nov 24, 2014
  3. Arviya

    Wake Distribution

    Arviya, Nov 20, 2014
    Replies:
    3
    Views:
    3,150
    jehardiman
    Nov 21, 2014
  4. bam_yat

    engine room ventilation

    bam_yat, Nov 10, 2014
    Replies:
    11
    Views:
    13,852
    PAR
    Nov 11, 2014
  5. rwatson

    Huge slow two stroke Piston Engines in LNG commercial ships

    rwatson, Sep 16, 2014
    Replies:
    5
    Views:
    5,079
    rwatson
    Sep 18, 2014
  6. Ol Gillnetter

    Keel Modification

    Ol Gillnetter, Jan 24, 2013 ... 2 3 4
    Replies:
    59
    Views:
    14,928
    Ol Gillnetter
    Aug 22, 2014
  7. Mr_CVT

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

    Mr_CVT, Jun 25, 2014
    Replies:
    6
    Views:
    6,080
    NoahWannabe
    Jun 28, 2014
  8. Paulc

    Compressed air battery/propulsion

    Paulc, Jun 15, 2014
    Replies:
    9
    Views:
    4,046
    Stumble
    Jun 18, 2014
  9. shuller1458

    Solar powered pontoon, question.

    shuller1458, May 29, 2014
    Replies:
    11
    Views:
    3,433
    Grey Ghost
    Jun 15, 2014
  10. rubenova

    Does anyone own a Yanmar Saildrive?

    rubenova, Jun 13, 2014
    Replies:
    2
    Views:
    2,790
    rubenova
    Jun 14, 2014
  11. ssawasare

    Blade material

    ssawasare, Jun 6, 2014
    Replies:
    1
    Views:
    2,132
    jehardiman
    Jun 6, 2014
  12. Ike

    Analyze This!

    Ike, May 30, 2014 ... 2
    Replies:
    17
    Views:
    4,085
    Petros
    Jun 2, 2014
  13. saltnz

    Alternatives in outboards

    saltnz, May 28, 2014
    Replies:
    9
    Views:
    3,331
    PAR
    Jun 1, 2014
  14. parkland

    Steam power

    parkland, Nov 6, 2013 ... 2 3
    Replies:
    39
    Views:
    8,521
    SamSam
    May 31, 2014
  15. nine mile

    Do hydrofoils work?

    nine mile, May 11, 2014
    Replies:
    6
    Views:
    2,998
    daiquiri
    May 14, 2014
  16. Kema

    Engine for 30 foot old and heavy ex fishing boat

    Kema, May 5, 2014
    Replies:
    5
    Views:
    3,275
    FAST FRED
    May 7, 2014
  17. Crocodile69

    An odd fix...

    Crocodile69, Apr 25, 2014
    Replies:
    6
    Views:
    3,072
    Crocodile69
    Apr 27, 2014
  18. MrLknowles2

    Homemade Outboard (Electric) - Help!

    MrLknowles2, Jul 26, 2012
    Replies:
    14
    Views:
    96,411
    boatindad
    Apr 25, 2014
  19. captainart

    Blackfin transom mounted rudders

    captainart, Apr 21, 2014
    Replies:
    0
    Views:
    5,640
    captainart
    Apr 21, 2014
  20. brian eiland

    Gas from Water, (WaterFuel), HHO technology

    brian eiland, May 15, 2006 ... 17 18 19
    Replies:
    278
    Views:
    76,011
    masrapido
    Apr 2, 2014
  21. lausl

    compact propulsion unit

    lausl, Mar 24, 2014
    Replies:
    6
    Views:
    3,361
    FAST FRED
    Mar 28, 2014
  22. QUICKNAVAL

    Propeller shaft and propeller diameter

    QUICKNAVAL, Mar 19, 2014
    Replies:
    6
    Views:
    16,380
    QUICKNAVAL
    Mar 22, 2014
  23. ssawasare

    safety factor for propeller in bollard astern condition

    ssawasare, Feb 20, 2014
    Replies:
    1
    Views:
    2,702
    jehardiman
    Feb 20, 2014
  24. mabdulhaq

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

    mabdulhaq, Sep 23, 2010 ... 2
    Replies:
    28
    Views:
    15,542
    Michael23
    Feb 16, 2014
  25. Jet_Love

    4 Stroke Cleaner Than 2, Really?

    Jet_Love, Jun 17, 2013 ... 3 4 5
    Replies:
    60
    Views:
    12,936
    FAST FRED
    Feb 11, 2014
  26. SuenosAzules

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

    SuenosAzules, Jan 29, 2014
    Replies:
    5
    Views:
    3,061
    Stumble
    Jan 29, 2014
  27. abohamza

    How can I select optimum boat propulsion system?

    abohamza, Apr 24, 2013
    Replies:
    11
    Views:
    3,643
    DaEdster
    Jan 7, 2014
  28. Saqa

    Looking for an inboard?

    Saqa, Dec 9, 2013
    Replies:
    5
    Views:
    2,685
    powerabout
    Dec 11, 2013
  29. DCockey

    Large Gas Engines - Different Directions

    DCockey, Nov 22, 2013
    Replies:
    8
    Views:
    3,442
    PAR
    Nov 25, 2013
  30. SailorDon

    Steam engine powered 40' cutter?

    SailorDon, Oct 17, 2013
    Replies:
    0
    Views:
    3,780
    SailorDon
    Oct 17, 2013
  31. tom kane

    Tunnel Rudders, Twin Rudders and similar.

    tom kane, Aug 30, 2013
    Replies:
    13
    Views:
    6,294
    tom kane
    Oct 6, 2013
  32. TSN13

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

    TSN13, Jan 18, 2013
    Replies:
    4
    Views:
    4,025
    BMcF
    Sep 27, 2013
  33. Sundevil

    Most efficient hull design

    Sundevil, Sep 8, 2013
    Replies:
    8
    Views:
    15,022
    philSweet
    Sep 19, 2013
  34. honda600js

    engine swap 2.3 OMC

    honda600js, Aug 7, 2013
    Replies:
    1
    Views:
    4,383
    IMP-ish
    Aug 20, 2013
  35. tom kane

    Big power V8 mud Boat drive.

    tom kane, Aug 14, 2013
    Replies:
    3
    Views:
    5,639
    wildwatson
    Aug 20, 2013
  36. TheCapt

    propulsion for pontoon deck boat

    TheCapt, Jul 28, 2013
    Replies:
    0
    Views:
    2,463
    TheCapt
    Jul 28, 2013
  37. YotaTruck

    Multiple trolling motors for electric only lakes?

    YotaTruck, Jul 22, 2013
    Replies:
    4
    Views:
    12,902
    PAR
    Jul 24, 2013
  38. CatBuilder

    Ganging Outboards - Does it work?

    CatBuilder, Jan 14, 2012 ... 11 12 13
    Replies:
    183
    Views:
    38,775
    DCockey
    Jul 19, 2013
  39. Wayne Kendall

    Universal joints & thrust bearings

    Wayne Kendall, Jun 30, 2013
    Replies:
    4
    Views:
    5,725
    FAST FRED
    Jul 2, 2013
  40. Wayne Kendall

    steady bearing clearance

    Wayne Kendall, Jul 1, 2013
    Replies:
    1
    Views:
    2,507
    daiquiri
    Jul 1, 2013
Showing threads 161 to 200 of 982

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