Props

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

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  1. Runhammar

    Choice of folding propeller for 29-footer

    Runhammar, Mar 23, 2023
    Replies:
    9
    Views:
    935
    skaraborgcraft
    Apr 3, 2023
  2. Noel McGettigan

    Thrust power

    Noel McGettigan, Dec 16, 2018 ... 2 3
    Replies:
    36
    Views:
    5,225
    Robert McFadden
    Mar 17, 2023
  3. Rodrigo Alves

    low rpm propeller

    Rodrigo Alves, Jan 11, 2023
    Replies:
    5
    Views:
    963
    Rodrigo Alves
    Jan 16, 2023
  4. fallguy

    Help Tuning a Powercat

    fallguy, Dec 27, 2022 ... 2
    Replies:
    27
    Views:
    1,003
    fallguy
    Dec 31, 2022
  5. missinginaction

    The mystery of a proper prop and terrible performance.

    missinginaction, Jan 25, 2020 ... 10 11 12
    Replies:
    170
    Views:
    18,134
    DogCavalry
    Oct 4, 2022
  6. slboatdesing

    Protecting creatures and coral from propellers

    slboatdesing, Aug 14, 2022
    Replies:
    11
    Views:
    1,164
    gonzo
    Aug 25, 2022
  7. Tapani

    Barrel length & diffuser

    Tapani, Aug 13, 2022
    Replies:
    2
    Views:
    517
    Tapani
    Aug 13, 2022
  8. duluthboats

    Looking for more thrust.

    duluthboats, Aug 12, 2022
    Replies:
    4
    Views:
    598
    jehardiman
    Aug 12, 2022
  9. sURAJ

    Propeller KA 4 70 Geometry

    sURAJ, Jul 8, 2017 ... 2
    Replies:
    15
    Views:
    7,799
    gonzo
    Jul 11, 2022
  10. ascial

    Propeller Design for Ka4-70

    ascial, Jul 9, 2022
    Replies:
    3
    Views:
    825
    baeckmo
    Jul 10, 2022
  11. fallguy

    Powercat prop sizing

    fallguy, Jun 16, 2022
    Replies:
    3
    Views:
    703
    DogCavalry
    Jun 17, 2022
  12. Zeiad Abbas

    Propeller A and B dimensions

    Zeiad Abbas, May 1, 2022
    Replies:
    4
    Views:
    989
    jehardiman
    May 3, 2022
  13. Shafri

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

    Shafri, Mar 26, 2022
    Replies:
    9
    Views:
    998
    Shafri
    Mar 29, 2022
  14. Magnus W

    Controllable pitch prop, effective range

    Magnus W, Aug 30, 2019 ... 2
    Replies:
    28
    Views:
    4,707
    aktxyz
    Mar 18, 2022
  15. gonzo

    Defining propeller pitch

    gonzo, Feb 12, 2022 ... 2
    Replies:
    29
    Views:
    2,563
    powerabout
    Feb 28, 2022
  16. sandhammaren05
    Locked

    Challenge to naval architects and marine engineers

    sandhammaren05, Feb 8, 2022 ... 2 3
    Replies:
    38
    Views:
    2,271
    sandhammaren05
    Feb 11, 2022
  17. Henry Swanepoel

    Propeller pitch on quad installations VS twins

    Henry Swanepoel, Jan 19, 2022
    Replies:
    10
    Views:
    1,152
    DogCavalry
    Jan 31, 2022
  18. cmaas

    Electric hydrofoil prop

    cmaas, Sep 8, 2020 ... 2 3 4
    Replies:
    53
    Views:
    6,296
    johneck
    Jan 6, 2022
  19. Slowboating

    Outboard prop modifications

    Slowboating, Oct 22, 2021 ... 2 3
    Replies:
    39
    Views:
    2,554
    johneck
    Nov 30, 2021
  20. sdowney717

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

    sdowney717, Aug 15, 2021
    Replies:
    7
    Views:
    1,203
    johneck
    Sep 8, 2021
  21. DogCavalry

    A Picture is Worth a Thousand Words

    DogCavalry, Jun 30, 2021 ... 2 3
    Replies:
    31
    Views:
    3,141
    powerabout
    Aug 31, 2021
  22. jake wilson

    how to find the angle of entrance

    jake wilson, Aug 24, 2021
    Replies:
    1
    Views:
    742
    TANSL
    Aug 24, 2021
  23. scopx

    redoing vintage 23' pontoon and propulsion choices

    scopx, Jul 19, 2021
    Replies:
    3
    Views:
    827
    bajansailor
    Jul 23, 2021
  24. Christopher Dodigovic

    Is this set up even possible to run?

    Christopher Dodigovic, Jun 23, 2021
    Replies:
    2
    Views:
    818
    Mr Efficiency
    Jun 23, 2021
  25. rfleet1066

    Correct prop size and speed

    rfleet1066, May 7, 2021 ... 2
    Replies:
    20
    Views:
    2,777
    rfleet1066
    May 12, 2021
  26. SwedenYachtsDaniel

    Prop size help

    SwedenYachtsDaniel, May 6, 2021
    Replies:
    12
    Views:
    2,007
    SwedenYachtsDaniel
    May 9, 2021
  27. enmico

    gearbox ratio calculation

    enmico, Apr 10, 2013 ... 2
    Replies:
    18
    Views:
    14,178
    Adler
    May 7, 2021
  28. Nicholas Castro

    What is the max RPM any propeller can spin before it becomes useless?

    Nicholas Castro, May 3, 2021
    Replies:
    8
    Views:
    3,526
    DogCavalry
    May 6, 2021
  29. Callum Stark

    Kort Nozzle Diameter (19A + Kaplan)

    Callum Stark, Apr 29, 2021
    Replies:
    5
    Views:
    2,072
    comfisherman
    May 1, 2021
  30. Roberto Certain

    Need help gear ratio

    Roberto Certain, Apr 24, 2021 ... 2
    Replies:
    16
    Views:
    2,419
    missinginaction
    Apr 26, 2021
  31. KenSmithFishing

    New video on prop selection

    KenSmithFishing, Apr 24, 2021
    Replies:
    0
    Views:
    927
    KenSmithFishing
    Apr 24, 2021
  32. BertKu

    A strange question

    BertKu, Dec 29, 2020 ... 2 3
    Replies:
    38
    Views:
    4,185
    gonzo
    Mar 23, 2021
  33. Chris Drake

    Expert seeking expert to bounce prop design ideas off

    Chris Drake, Jun 12, 2020 ... 2
    Replies:
    20
    Views:
    2,962
    gonzo
    Mar 7, 2021
  34. Astrocat505

    Gear ratio for pedal drive

    Astrocat505, Feb 18, 2021
    Replies:
    11
    Views:
    2,524
    Tiny Turnip
    Feb 24, 2021
  35. Ron Mintle

    Prop for Electric Motor

    Ron Mintle, Feb 13, 2021
    Replies:
    3
    Views:
    1,353
    jehardiman
    Feb 14, 2021
  36. DogCavalry

    Oversized prop compromise

    DogCavalry, Sep 24, 2020 ... 2 3 4
    Replies:
    54
    Views:
    5,111
    DogCavalry
    Feb 12, 2021
  37. DogCavalry

    Propulsive Efficiency related to hub diameter

    DogCavalry, Feb 11, 2021
    Replies:
    12
    Views:
    1,346
    DogCavalry
    Feb 12, 2021
  38. jtpmail

    How can I calculate the Torque needed to start a large prop turning?

    jtpmail, Oct 6, 2018
    Replies:
    13
    Views:
    4,652
    DogCavalry
    Feb 11, 2021
  39. tonipu

    Propulsion for New boat

    tonipu, Jan 20, 2021 ... 2
    Replies:
    20
    Views:
    1,914
    tonipu
    Feb 8, 2021
  40. ldigas

    Gawn Burrill article "Effect of cavitation on..." missing a page - can anyone help?

    ldigas, Jan 22, 2021
    Replies:
    4
    Views:
    1,058
    Mr Efficiency
    Jan 22, 2021
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