Props

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

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  1. pistnbroke

    Availability of 6 spline props

    pistnbroke, Dec 23, 2024
    Replies:
    10
    Views:
    1,304
    BlueBell
    Dec 30, 2024
  2. Dave G 9N

    Atkin's Happy Clam's propeller

    Dave G 9N, Sep 15, 2024 ... 2 3 4
    Replies:
    48
    Views:
    2,659
    rangebowdrie
    Oct 16, 2024
  3. Matthew Dunk

    Resizing a prop for a small electric outboard.

    Matthew Dunk, Aug 3, 2024 ... 2
    Replies:
    26
    Views:
    1,982
    fallguy
    Aug 8, 2024
  4. Floyd S.

    propeller comparison

    Floyd S., Jul 12, 2024
    Replies:
    10
    Views:
    1,306
    comfisherman
    Jul 16, 2024
  5. patrickza

    Angling dual outboards toe-in for docking

    patrickza, Jun 25, 2024
    Replies:
    6
    Views:
    1,037
    DCockey
    Sep 20, 2024
  6. ToMeK

    Preliminary Design Propulsion Efficiency

    ToMeK, Apr 27, 2024
    Replies:
    3
    Views:
    988
    Alik
    May 1, 2024
  7. NWestward

    Thoughts on prop load for com-fish/tow boat

    NWestward, Apr 23, 2024 ... 2 3
    Replies:
    44
    Views:
    3,517
    comfisherman
    Sep 16, 2024
  8. Robert Biegler

    Sharrow counterrotating propeller seems to have negative stagger and positive stagger

    Robert Biegler, Apr 19, 2024
    Replies:
    5
    Views:
    1,302
    DogCavalry
    Apr 27, 2024
  9. Furkan

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

    Furkan, Apr 17, 2024
    Replies:
    5
    Views:
    1,716
    philSweet
    Apr 19, 2024
  10. HotJava66

    Tunnel drive propeller selection

    HotJava66, Apr 13, 2024
    Replies:
    7
    Views:
    1,548
    baeckmo
    Apr 17, 2024
  11. Greifnation

    Correct prop for boat

    Greifnation, Mar 31, 2024
    Replies:
    6
    Views:
    1,184
    philSweet
    Mar 31, 2024
  12. Swamplizard

    Prop Shaft Adaptor: 19 spline to Keyed?

    Swamplizard, Mar 13, 2024
    Replies:
    11
    Views:
    2,109
    Bryan carroll
    May 21, 2024
  13. Vronsky

    Marking on prop stopper?

    Vronsky, Dec 31, 2023
    Replies:
    0
    Views:
    1,494
    Vronsky
    Dec 31, 2023
  14. cmaas

    Prop selection question for 6m foil assisted power cat

    cmaas, Dec 15, 2023 ... 2
    Replies:
    29
    Views:
    2,986
    cmaas
    Dec 18, 2023
  15. Vronsky

    Max pitch size ?

    Vronsky, Oct 18, 2023
    Replies:
    3
    Views:
    1,733
    Vronsky
    Oct 19, 2023
  16. Ron West

    Electric Outboard Speed

    Ron West, Aug 2, 2023 ... 2
    Replies:
    19
    Views:
    6,226
    silvestre
    May 2, 2024
  17. BS Flinn

    Upgrading trolling motor prop

    BS Flinn, Jul 15, 2023
    Replies:
    10
    Views:
    6,329
    SamuelChukweze
    Aug 3, 2023
  18. FroudeAwakening

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

    FroudeAwakening, Jul 14, 2023
    Replies:
    1
    Views:
    2,127
    Skyak
    Jul 14, 2023
  19. Tartilla

    30ft Cobalt Arneson Blown BBCs prop suggestions

    Tartilla, Jun 29, 2023
    Replies:
    0
    Views:
    1,140
    Tartilla
    Jun 29, 2023
  20. Bob Rosa

    Need help calculating what dia and pitch propeller to use?

    Bob Rosa, Jun 28, 2023
    Replies:
    9
    Views:
    2,768
    Bob Rosa
    Jul 21, 2023
  21. Tedd McHenry

    Acceptable Axial Runout?

    Tedd McHenry, Jun 20, 2023
    Replies:
    1
    Views:
    1,200
    jehardiman
    Jun 21, 2023
  22. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    2,254
    skaraborgcraft
    Apr 3, 2023
  23. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    3,733
    Rodrigo Alves
    Jan 16, 2023
  24. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    3,174
    fallguy
    Dec 31, 2022
  25. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    2,760
    gonzo
    Aug 25, 2022
  26. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    1,485
    Tapani
    Aug 13, 2022
  27. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    1,943
    jehardiman
    Aug 12, 2022
  28. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    2,400
    baeckmo
    Jul 10, 2022
  29. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    1,921
    DogCavalry
    Jun 17, 2022
  30. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    2,216
    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:
    2,447
    Shafri
    Mar 29, 2022
  32. gonzo

    Defining propeller pitch

    gonzo, Feb 12, 2022 ... 2
    Replies:
    29
    Views:
    6,252
    powerabout
    Feb 28, 2022
  33. sandhammaren05
    Locked

    Challenge to naval architects and marine engineers

    sandhammaren05, Feb 8, 2022 ... 2 3
    Replies:
    38
    Views:
    5,241
    sandhammaren05
    Feb 11, 2022
  34. Henry Swanepoel

    Propeller pitch on quad installations VS twins

    Henry Swanepoel, Jan 19, 2022
    Replies:
    10
    Views:
    2,651
    DogCavalry
    Jan 31, 2022
  35. Slowboating

    Outboard prop modifications

    Slowboating, Oct 22, 2021 ... 2 3
    Replies:
    39
    Views:
    5,508
    johneck
    Nov 30, 2021
  36. jake wilson

    how to find the angle of entrance

    jake wilson, Aug 24, 2021
    Replies:
    1
    Views:
    1,568
    TANSL
    Aug 24, 2021
  37. sdowney717

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

    sdowney717, Aug 15, 2021
    Replies:
    7
    Views:
    2,015
    johneck
    Sep 8, 2021
  38. scopx

    redoing vintage 23' pontoon and propulsion choices

    scopx, Jul 19, 2021
    Replies:
    3
    Views:
    1,443
    bajansailor
    Jul 23, 2021
  39. DogCavalry

    A Picture is Worth a Thousand Words

    DogCavalry, Jun 30, 2021 ... 2 3
    Replies:
    31
    Views:
    5,130
    powerabout
    Aug 31, 2021
  40. Christopher Dodigovic

    Is this set up even possible to run?

    Christopher Dodigovic, Jun 23, 2021
    Replies:
    2
    Views:
    1,448
    Mr Efficiency
    Jun 23, 2021
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