Props

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

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  1. Robert Biegler

    Sharrow counterrotating propeller seems to have negative stagger and positive stagger

    Robert Biegler, Apr 19, 2024 at 3:01 PM
    Replies:
    3
    Views:
    140
    seasquirt
    Apr 22, 2024 at 9:42 PM
  2. Furkan

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

    Furkan, Apr 17, 2024 at 1:29 AM
    Replies:
    5
    Views:
    221
    philSweet
    Apr 19, 2024 at 10:34 PM
  3. HotJava66

    Tunnel drive propeller selection

    HotJava66, Apr 13, 2024
    Replies:
    7
    Views:
    279
    baeckmo
    Apr 17, 2024 at 2:48 PM
  4. Greifnation

    Correct prop for boat

    Greifnation, Mar 31, 2024
    Replies:
    6
    Views:
    434
    philSweet
    Mar 31, 2024
  5. Swamplizard

    Prop Shaft Adaptor: 19 spline to Keyed?

    Swamplizard, Mar 13, 2024
    Replies:
    9
    Views:
    587
    baeckmo
    Mar 19, 2024
  6. Vronsky

    Marking on prop stopper?

    Vronsky, Dec 31, 2023
    Replies:
    0
    Views:
    989
    Vronsky
    Dec 31, 2023
  7. cmaas

    Prop selection question for 6m foil assisted power cat

    cmaas, Dec 15, 2023 ... 2
    Replies:
    29
    Views:
    1,445
    cmaas
    Dec 18, 2023
  8. Vronsky

    Max pitch size ?

    Vronsky, Oct 18, 2023
    Replies:
    3
    Views:
    1,146
    Vronsky
    Oct 19, 2023
  9. Ron West

    Electric Outboard Speed

    Ron West, Aug 2, 2023 ... 2
    Replies:
    18
    Views:
    3,489
    Nidza
    Sep 9, 2023
  10. BS Flinn

    Upgrading trolling motor prop

    BS Flinn, Jul 15, 2023
    Replies:
    10
    Views:
    2,696
    SamuelChukweze
    Aug 3, 2023
  11. missinginaction

    The mystery of a proper prop and terrible performance

    missinginaction, Jan 25, 2020 ... 11 12 13
    Replies:
    180
    Views:
    23,890
    Nidza
    Jul 30, 2023
  12. Bob Rosa

    Need help calculating what dia and pitch propeller to use?

    Bob Rosa, Jun 28, 2023
    Replies:
    9
    Views:
    1,936
    Bob Rosa
    Jul 21, 2023
  13. FroudeAwakening

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

    FroudeAwakening, Jul 14, 2023
    Replies:
    1
    Views:
    1,098
    Skyak
    Jul 14, 2023
  14. Tartilla

    30ft Cobalt Arneson Blown BBCs prop suggestions

    Tartilla, Jun 29, 2023
    Replies:
    0
    Views:
    648
    Tartilla
    Jun 29, 2023
  15. Tedd McHenry

    Acceptable Axial Runout?

    Tedd McHenry, Jun 20, 2023
    Replies:
    1
    Views:
    736
    jehardiman
    Jun 21, 2023
  16. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    1,571
    skaraborgcraft
    Apr 3, 2023
  17. Noel McGettigan

    Thrust power

    Noel McGettigan, Dec 16, 2018 ... 2 3
    Replies:
    36
    Views:
    7,021
    Robert McFadden
    Mar 17, 2023
  18. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    2,051
    Rodrigo Alves
    Jan 16, 2023
  19. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    1,905
    fallguy
    Dec 31, 2022
  20. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    1,800
    gonzo
    Aug 25, 2022
  21. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    972
    Tapani
    Aug 13, 2022
  22. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    1,229
    jehardiman
    Aug 12, 2022
  23. sURAJ

    Propeller KA 4 70 Geometry

    sURAJ, Jul 8, 2017 ... 2
    Replies:
    15
    Views:
    9,701
    gonzo
    Jul 11, 2022
  24. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    1,608
    baeckmo
    Jul 10, 2022
  25. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    1,273
    DogCavalry
    Jun 17, 2022
  26. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    1,589
    jehardiman
    May 3, 2022
  27. Shafri

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

    Shafri, Mar 26, 2022
    Replies:
    9
    Views:
    1,628
    Shafri
    Mar 29, 2022
  28. Magnus W

    Controllable pitch prop, effective range

    Magnus W, Aug 30, 2019 ... 2
    Replies:
    28
    Views:
    6,258
    aktxyz
    Mar 18, 2022
  29. gonzo

    Defining propeller pitch

    gonzo, Feb 12, 2022 ... 2
    Replies:
    29
    Views:
    3,992
    powerabout
    Feb 28, 2022
  30. sandhammaren05
    Locked

    Challenge to naval architects and marine engineers

    sandhammaren05, Feb 8, 2022 ... 2 3
    Replies:
    38
    Views:
    3,631
    sandhammaren05
    Feb 11, 2022
  31. Henry Swanepoel

    Propeller pitch on quad installations VS twins

    Henry Swanepoel, Jan 19, 2022
    Replies:
    10
    Views:
    1,826
    DogCavalry
    Jan 31, 2022
  32. cmaas

    Electric hydrofoil prop

    cmaas, Sep 8, 2020 ... 2 3 4
    Replies:
    53
    Views:
    8,185
    johneck
    Jan 6, 2022
  33. Slowboating

    Outboard prop modifications

    Slowboating, Oct 22, 2021 ... 2 3
    Replies:
    39
    Views:
    3,535
    johneck
    Nov 30, 2021
  34. sdowney717

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

    sdowney717, Aug 15, 2021
    Replies:
    7
    Views:
    1,604
    johneck
    Sep 8, 2021
  35. DogCavalry

    A Picture is Worth a Thousand Words

    DogCavalry, Jun 30, 2021 ... 2 3
    Replies:
    31
    Views:
    4,065
    powerabout
    Aug 31, 2021
  36. jake wilson

    how to find the angle of entrance

    jake wilson, Aug 24, 2021
    Replies:
    1
    Views:
    1,087
    TANSL
    Aug 24, 2021
  37. scopx

    redoing vintage 23' pontoon and propulsion choices

    scopx, Jul 19, 2021
    Replies:
    3
    Views:
    1,102
    bajansailor
    Jul 23, 2021
  38. Christopher Dodigovic

    Is this set up even possible to run?

    Christopher Dodigovic, Jun 23, 2021
    Replies:
    2
    Views:
    1,110
    Mr Efficiency
    Jun 23, 2021
  39. rfleet1066

    Correct prop size and speed

    rfleet1066, May 7, 2021 ... 2
    Replies:
    20
    Views:
    3,704
    rfleet1066
    May 12, 2021
  40. SwedenYachtsDaniel

    Prop size help

    SwedenYachtsDaniel, May 6, 2021
    Replies:
    12
    Views:
    2,785
    SwedenYachtsDaniel
    May 9, 2021
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