Props

Propeller selection, performance comparison, prediction, experience, and modification.

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  1. SokSanManagement

    Help & ideas for easy steering Vietnamese style longtail engine / prop (to heavy operation)

    SokSanManagement, Jan 2, 2026
    Replies:
    7
    Views:
    1,879
    gonzo
    Feb 5, 2026
  2. bcripps

    prop for under powered sailboat

    bcripps, May 2, 2011 ... 2
    Replies:
    27
    Views:
    5,187
    HelmutSheina
    Jan 27, 2026
  3. missinginaction

    The mystery of a proper prop and terrible performance

    missinginaction, Jan 25, 2020 ... 11 12 13
    Replies:
    188
    Views:
    48,544
    sdowney717
    Jul 22, 2025
  4. Todor Mihaylov

    Seeking Input for DIY Propeller Cleaning Tool – Master's Thesis Research Survey

    Todor Mihaylov, Apr 27, 2025
    Replies:
    3
    Views:
    2,615
    gonzo
    Apr 29, 2025
  5. pistnbroke

    Availability of 6 spline props

    pistnbroke, Dec 23, 2024
    Replies:
    10
    Views:
    3,424
    BlueBell
    Dec 30, 2024
  6. Mik the stick

    Power predition formula

    Mik the stick, Dec 13, 2012 ... 2
    Replies:
    19
    Views:
    13,219
    Dave G 9N
    Oct 16, 2024
  7. Dave G 9N

    Atkin's Happy Clam's propeller

    Dave G 9N, Sep 15, 2024 ... 2 3 4
    Replies:
    48
    Views:
    6,589
    rangebowdrie
    Oct 16, 2024
  8. patrickza

    Angling dual outboards toe-in for docking

    patrickza, Jun 25, 2024
    Replies:
    6
    Views:
    2,182
    DCockey
    Sep 20, 2024
  9. NWestward

    Thoughts on prop load for com-fish/tow boat

    NWestward, Apr 23, 2024 ... 2 3
    Replies:
    44
    Views:
    6,663
    comfisherman
    Sep 16, 2024
  10. Matthew Dunk

    Resizing a prop for a small electric outboard.

    Matthew Dunk, Aug 3, 2024 ... 2
    Replies:
    26
    Views:
    5,419
    fallguy
    Aug 8, 2024
  11. Floyd S.

    propeller comparison

    Floyd S., Jul 12, 2024
    Replies:
    10
    Views:
    2,860
    comfisherman
    Jul 16, 2024
  12. pavel915

    prop selection

    pavel915, Aug 16, 2008
    Replies:
    7
    Views:
    5,934
    Tongichi
    May 29, 2024
  13. Swamplizard

    Prop Shaft Adaptor: 19 spline to Keyed?

    Swamplizard, Mar 13, 2024
    Replies:
    11
    Views:
    3,813
    Bryan carroll
    May 21, 2024
  14. Ron West

    Electric Outboard Speed

    Ron West, Aug 2, 2023 ... 2
    Replies:
    19
    Views:
    11,009
    silvestre
    May 2, 2024
  15. ToMeK

    Preliminary Design Propulsion Efficiency

    ToMeK, Apr 27, 2024
    Replies:
    3
    Views:
    2,106
    Alik
    May 1, 2024
  16. Spyderz

    Wageningen B-Series BP-Delta Diagrams Request

    Spyderz, Apr 6, 2011
    Replies:
    12
    Views:
    22,073
    plr
    Apr 30, 2024
  17. Gman999

    Designing a propeller using Gawn Standard Series propeller (URGENT)

    Gman999, Jan 22, 2019
    Replies:
    4
    Views:
    6,887
    plr
    Apr 30, 2024
  18. Robert Biegler

    Sharrow counterrotating propeller seems to have negative stagger and positive stagger

    Robert Biegler, Apr 19, 2024
    Replies:
    5
    Views:
    2,968
    DogCavalry
    Apr 27, 2024
  19. Furkan

    How do different propeller shaft angles impact the performance of marine vessels?

    Furkan, Apr 17, 2024
    Replies:
    5
    Views:
    5,614
    philSweet
    Apr 19, 2024
  20. HotJava66

    Tunnel drive propeller selection

    HotJava66, Apr 13, 2024
    Replies:
    7
    Views:
    4,537
    baeckmo
    Apr 17, 2024
  21. Greifnation

    Correct prop for boat

    Greifnation, Mar 31, 2024
    Replies:
    6
    Views:
    2,176
    philSweet
    Mar 31, 2024
  22. Vronsky

    Marking on prop stopper?

    Vronsky, Dec 31, 2023
    Replies:
    0
    Views:
    2,280
    Vronsky
    Dec 31, 2023
  23. cmaas

    Prop selection question for 6m foil assisted power cat

    cmaas, Dec 15, 2023 ... 2
    Replies:
    29
    Views:
    6,285
    cmaas
    Dec 18, 2023
  24. Vronsky

    Max pitch size ?

    Vronsky, Oct 18, 2023
    Replies:
    3
    Views:
    2,735
    Vronsky
    Oct 19, 2023
  25. BS Flinn

    Upgrading trolling motor prop

    BS Flinn, Jul 15, 2023
    Replies:
    10
    Views:
    11,668
    SamuelChukweze
    Aug 3, 2023
  26. Bob Rosa

    Need help calculating what dia and pitch propeller to use?

    Bob Rosa, Jun 28, 2023
    Replies:
    9
    Views:
    4,121
    Bob Rosa
    Jul 21, 2023
  27. FroudeAwakening

    Toroidal Propellers (e.g. Sharrow) for Human Powered Boats?

    FroudeAwakening, Jul 14, 2023
    Replies:
    1
    Views:
    3,959
    Skyak
    Jul 14, 2023
  28. Tartilla

    30ft Cobalt Arneson Blown BBCs prop suggestions

    Tartilla, Jun 29, 2023
    Replies:
    0
    Views:
    2,011
    Tartilla
    Jun 29, 2023
  29. Tedd McHenry

    Acceptable Axial Runout?

    Tedd McHenry, Jun 20, 2023
    Replies:
    1
    Views:
    1,897
    jehardiman
    Jun 21, 2023
  30. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    3,276
    skaraborgcraft
    Apr 3, 2023
  31. Noel McGettigan

    Thrust power

    Noel McGettigan, Dec 16, 2018 ... 2 3
    Replies:
    36
    Views:
    12,630
    Robert McFadden
    Mar 17, 2023
  32. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    6,084
    Rodrigo Alves
    Jan 16, 2023
  33. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    5,438
    fallguy
    Dec 31, 2022
  34. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    4,384
    gonzo
    Aug 25, 2022
  35. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    2,280
    Tapani
    Aug 13, 2022
  36. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    3,210
    jehardiman
    Aug 12, 2022
  37. sURAJ

    Propeller KA 4 70 Geometry

    sURAJ, Jul 8, 2017 ... 2
    Replies:
    15
    Views:
    15,075
    gonzo
    Jul 11, 2022
  38. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    3,523
    baeckmo
    Jul 10, 2022
  39. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    3,032
    DogCavalry
    Jun 17, 2022
  40. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    3,373
    jehardiman
    May 3, 2022
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