Props

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

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  1. missinginaction

    The mystery of a proper prop and terrible performance

    missinginaction, Jan 25, 2020 ... 11 12 13
    Replies:
    188
    Views:
    40,945
    sdowney717
    Jul 22, 2025
  2. Todor Mihaylov

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

    Todor Mihaylov, Apr 27, 2025
    Replies:
    3
    Views:
    1,681
    gonzo
    Apr 29, 2025
  3. pistnbroke

    Availability of 6 spline props

    pistnbroke, Dec 23, 2024
    Replies:
    10
    Views:
    2,639
    BlueBell
    Dec 30, 2024
  4. Mik the stick

    Power predition formula

    Mik the stick, Dec 13, 2012 ... 2
    Replies:
    19
    Views:
    12,111
    Dave G 9N
    Oct 16, 2024
  5. Dave G 9N

    Atkin's Happy Clam's propeller

    Dave G 9N, Sep 15, 2024 ... 2 3 4
    Replies:
    48
    Views:
    4,933
    rangebowdrie
    Oct 16, 2024
  6. patrickza

    Angling dual outboards toe-in for docking

    patrickza, Jun 25, 2024
    Replies:
    6
    Views:
    1,737
    DCockey
    Sep 20, 2024
  7. NWestward

    Thoughts on prop load for com-fish/tow boat

    NWestward, Apr 23, 2024 ... 2 3
    Replies:
    44
    Views:
    5,279
    comfisherman
    Sep 16, 2024
  8. Matthew Dunk

    Resizing a prop for a small electric outboard.

    Matthew Dunk, Aug 3, 2024 ... 2
    Replies:
    26
    Views:
    4,159
    fallguy
    Aug 8, 2024
  9. Floyd S.

    propeller comparison

    Floyd S., Jul 12, 2024
    Replies:
    10
    Views:
    2,210
    comfisherman
    Jul 16, 2024
  10. pavel915

    prop selection

    pavel915, Aug 16, 2008
    Replies:
    7
    Views:
    5,562
    Tongichi
    May 29, 2024
  11. Swamplizard

    Prop Shaft Adaptor: 19 spline to Keyed?

    Swamplizard, Mar 13, 2024
    Replies:
    11
    Views:
    3,062
    Bryan carroll
    May 21, 2024
  12. Ron West

    Electric Outboard Speed

    Ron West, Aug 2, 2023 ... 2
    Replies:
    19
    Views:
    9,308
    silvestre
    May 2, 2024
  13. ToMeK

    Preliminary Design Propulsion Efficiency

    ToMeK, Apr 27, 2024
    Replies:
    3
    Views:
    1,653
    Alik
    May 1, 2024
  14. Spyderz

    Wageningen B-Series BP-Delta Diagrams Request

    Spyderz, Apr 6, 2011
    Replies:
    12
    Views:
    21,144
    plr
    Apr 30, 2024
  15. Gman999

    Designing a propeller using Gawn Standard Series propeller (URGENT)

    Gman999, Jan 22, 2019
    Replies:
    4
    Views:
    6,213
    plr
    Apr 30, 2024
  16. Robert Biegler

    Sharrow counterrotating propeller seems to have negative stagger and positive stagger

    Robert Biegler, Apr 19, 2024
    Replies:
    5
    Views:
    2,199
    DogCavalry
    Apr 27, 2024
  17. Furkan

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

    Furkan, Apr 17, 2024
    Replies:
    5
    Views:
    3,759
    philSweet
    Apr 19, 2024
  18. HotJava66

    Tunnel drive propeller selection

    HotJava66, Apr 13, 2024
    Replies:
    7
    Views:
    3,308
    baeckmo
    Apr 17, 2024
  19. Greifnation

    Correct prop for boat

    Greifnation, Mar 31, 2024
    Replies:
    6
    Views:
    1,759
    philSweet
    Mar 31, 2024
  20. Vronsky

    Marking on prop stopper?

    Vronsky, Dec 31, 2023
    Replies:
    0
    Views:
    1,955
    Vronsky
    Dec 31, 2023
  21. cmaas

    Prop selection question for 6m foil assisted power cat

    cmaas, Dec 15, 2023 ... 2
    Replies:
    29
    Views:
    4,783
    cmaas
    Dec 18, 2023
  22. Vronsky

    Max pitch size ?

    Vronsky, Oct 18, 2023
    Replies:
    3
    Views:
    2,362
    Vronsky
    Oct 19, 2023
  23. BS Flinn

    Upgrading trolling motor prop

    BS Flinn, Jul 15, 2023
    Replies:
    10
    Views:
    9,793
    SamuelChukweze
    Aug 3, 2023
  24. Bob Rosa

    Need help calculating what dia and pitch propeller to use?

    Bob Rosa, Jun 28, 2023
    Replies:
    9
    Views:
    3,583
    Bob Rosa
    Jul 21, 2023
  25. FroudeAwakening

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

    FroudeAwakening, Jul 14, 2023
    Replies:
    1
    Views:
    3,123
    Skyak
    Jul 14, 2023
  26. Tartilla

    30ft Cobalt Arneson Blown BBCs prop suggestions

    Tartilla, Jun 29, 2023
    Replies:
    0
    Views:
    1,702
    Tartilla
    Jun 29, 2023
  27. Tedd McHenry

    Acceptable Axial Runout?

    Tedd McHenry, Jun 20, 2023
    Replies:
    1
    Views:
    1,629
    jehardiman
    Jun 21, 2023
  28. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    2,829
    skaraborgcraft
    Apr 3, 2023
  29. Noel McGettigan

    Thrust power

    Noel McGettigan, Dec 16, 2018 ... 2 3
    Replies:
    36
    Views:
    11,012
    Robert McFadden
    Mar 17, 2023
  30. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    5,023
    Rodrigo Alves
    Jan 16, 2023
  31. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    4,423
    fallguy
    Dec 31, 2022
  32. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    3,631
    gonzo
    Aug 25, 2022
  33. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    1,965
    Tapani
    Aug 13, 2022
  34. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    2,689
    jehardiman
    Aug 12, 2022
  35. sURAJ

    Propeller KA 4 70 Geometry

    sURAJ, Jul 8, 2017 ... 2
    Replies:
    15
    Views:
    13,689
    gonzo
    Jul 11, 2022
  36. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    3,031
    baeckmo
    Jul 10, 2022
  37. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    2,566
    DogCavalry
    Jun 17, 2022
  38. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    2,871
    jehardiman
    May 3, 2022
  39. Shafri

    Looking for Seller of Cleaver/Surface Piercing Propeller 5/6 Blades 100HP

    Shafri, Mar 26, 2022
    Replies:
    9
    Views:
    3,267
    Shafri
    Mar 29, 2022
  40. Magnus W

    Controllable pitch prop, effective range

    Magnus W, Aug 30, 2019 ... 2
    Replies:
    28
    Views:
    10,880
    aktxyz
    Mar 18, 2022
Showing threads 1 to 40 of 543

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