Props

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

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  1. NWestward

    Thoughts on prop load for com-fish/tow boat

    NWestward, Apr 23, 2024 ... 2 3
    Replies:
    42
    Views:
    939
    comfisherman
    May 4, 2024 at 7:42 PM
  2. Ron West

    Electric Outboard Speed

    Ron West, Aug 2, 2023 ... 2
    Replies:
    19
    Views:
    3,638
    silvestre
    May 2, 2024 at 11:10 AM
  3. ToMeK

    Preliminary Design Propulsion Efficiency

    ToMeK, Apr 27, 2024
    Replies:
    3
    Views:
    223
    Alik
    May 1, 2024
  4. Spyderz

    Wageningen B-Series BP-Delta Diagrams Request

    Spyderz, Apr 6, 2011
    Replies:
    12
    Views:
    18,626
    plr
    Apr 30, 2024
  5. Gman999

    Designing a propeller using Gawn Standard Series propeller (URGENT)

    Gman999, Jan 22, 2019
    Replies:
    4
    Views:
    4,136
    plr
    Apr 30, 2024
  6. Robert Biegler

    Sharrow counterrotating propeller seems to have negative stagger and positive stagger

    Robert Biegler, Apr 19, 2024
    Replies:
    5
    Views:
    310
    DogCavalry
    Apr 27, 2024
  7. Furkan

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

    Furkan, Apr 17, 2024
    Replies:
    5
    Views:
    302
    philSweet
    Apr 19, 2024
  8. HotJava66

    Tunnel drive propeller selection

    HotJava66, Apr 13, 2024
    Replies:
    7
    Views:
    323
    baeckmo
    Apr 17, 2024
  9. Greifnation

    Correct prop for boat

    Greifnation, Mar 31, 2024
    Replies:
    6
    Views:
    492
    philSweet
    Mar 31, 2024
  10. Swamplizard

    Prop Shaft Adaptor: 19 spline to Keyed?

    Swamplizard, Mar 13, 2024
    Replies:
    9
    Views:
    622
    baeckmo
    Mar 19, 2024
  11. Vronsky

    Marking on prop stopper?

    Vronsky, Dec 31, 2023
    Replies:
    0
    Views:
    1,014
    Vronsky
    Dec 31, 2023
  12. cmaas

    Prop selection question for 6m foil assisted power cat

    cmaas, Dec 15, 2023 ... 2
    Replies:
    29
    Views:
    1,510
    cmaas
    Dec 18, 2023
  13. Vronsky

    Max pitch size ?

    Vronsky, Oct 18, 2023
    Replies:
    3
    Views:
    1,177
    Vronsky
    Oct 19, 2023
  14. BS Flinn

    Upgrading trolling motor prop

    BS Flinn, Jul 15, 2023
    Replies:
    10
    Views:
    2,859
    SamuelChukweze
    Aug 3, 2023
  15. missinginaction

    The mystery of a proper prop and terrible performance

    missinginaction, Jan 25, 2020 ... 11 12 13
    Replies:
    180
    Views:
    24,115
    Nidza
    Jul 30, 2023
  16. Bob Rosa

    Need help calculating what dia and pitch propeller to use?

    Bob Rosa, Jun 28, 2023
    Replies:
    9
    Views:
    1,974
    Bob Rosa
    Jul 21, 2023
  17. FroudeAwakening

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

    FroudeAwakening, Jul 14, 2023
    Replies:
    1
    Views:
    1,150
    Skyak
    Jul 14, 2023
  18. Tartilla

    30ft Cobalt Arneson Blown BBCs prop suggestions

    Tartilla, Jun 29, 2023
    Replies:
    0
    Views:
    671
    Tartilla
    Jun 29, 2023
  19. Tedd McHenry

    Acceptable Axial Runout?

    Tedd McHenry, Jun 20, 2023
    Replies:
    1
    Views:
    749
    jehardiman
    Jun 21, 2023
  20. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    1,602
    skaraborgcraft
    Apr 3, 2023
  21. Noel McGettigan

    Thrust power

    Noel McGettigan, Dec 16, 2018 ... 2 3
    Replies:
    36
    Views:
    7,103
    Robert McFadden
    Mar 17, 2023
  22. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    2,118
    Rodrigo Alves
    Jan 16, 2023
  23. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    1,951
    fallguy
    Dec 31, 2022
  24. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    1,842
    gonzo
    Aug 25, 2022
  25. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    996
    Tapani
    Aug 13, 2022
  26. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    1,264
    jehardiman
    Aug 12, 2022
  27. sURAJ

    Propeller KA 4 70 Geometry

    sURAJ, Jul 8, 2017 ... 2
    Replies:
    15
    Views:
    9,780
    gonzo
    Jul 11, 2022
  28. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    1,646
    baeckmo
    Jul 10, 2022
  29. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    1,305
    DogCavalry
    Jun 17, 2022
  30. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    1,628
    jehardiman
    May 3, 2022
  31. Shafri

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

    Shafri, Mar 26, 2022
    Replies:
    9
    Views:
    1,661
    Shafri
    Mar 29, 2022
  32. Magnus W

    Controllable pitch prop, effective range

    Magnus W, Aug 30, 2019 ... 2
    Replies:
    28
    Views:
    6,357
    aktxyz
    Mar 18, 2022
  33. gonzo

    Defining propeller pitch

    gonzo, Feb 12, 2022 ... 2
    Replies:
    29
    Views:
    4,078
    powerabout
    Feb 28, 2022
  34. sandhammaren05
    Locked

    Challenge to naval architects and marine engineers

    sandhammaren05, Feb 8, 2022 ... 2 3
    Replies:
    38
    Views:
    3,704
    sandhammaren05
    Feb 11, 2022
  35. Henry Swanepoel

    Propeller pitch on quad installations VS twins

    Henry Swanepoel, Jan 19, 2022
    Replies:
    10
    Views:
    1,875
    DogCavalry
    Jan 31, 2022
  36. cmaas

    Electric hydrofoil prop

    cmaas, Sep 8, 2020 ... 2 3 4
    Replies:
    53
    Views:
    8,307
    johneck
    Jan 6, 2022
  37. Slowboating

    Outboard prop modifications

    Slowboating, Oct 22, 2021 ... 2 3
    Replies:
    39
    Views:
    3,629
    johneck
    Nov 30, 2021
  38. sdowney717

    Are my props too big? 22 by 20, 3 blades, a 1970 Eggharbor 37

    sdowney717, Aug 15, 2021
    Replies:
    7
    Views:
    1,632
    johneck
    Sep 8, 2021
  39. DogCavalry

    A Picture is Worth a Thousand Words

    DogCavalry, Jun 30, 2021 ... 2 3
    Replies:
    31
    Views:
    4,148
    powerabout
    Aug 31, 2021
  40. jake wilson

    how to find the angle of entrance

    jake wilson, Aug 24, 2021
    Replies:
    1
    Views:
    1,107
    TANSL
    Aug 24, 2021
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