Props

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

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  1. Shafri

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

    Shafri, Mar 26, 2022
    Replies:
    9
    Views:
    3,755
    Shafri
    Mar 29, 2022
  2. Magnus W

    Controllable pitch prop, effective range

    Magnus W, Aug 30, 2019 ... 2
    Replies:
    28
    Views:
    12,141
    aktxyz
    Mar 18, 2022
  3. gonzo

    Defining propeller pitch

    gonzo, Feb 12, 2022 ... 2
    Replies:
    29
    Views:
    9,547
    powerabout
    Feb 28, 2022
  4. sandhammaren05
    Locked

    Challenge to naval architects and marine engineers

    sandhammaren05, Feb 8, 2022 ... 2 3
    Replies:
    38
    Views:
    7,408
    sandhammaren05
    Feb 11, 2022
  5. Henry Swanepoel

    Propeller pitch on quad installations VS twins

    Henry Swanepoel, Jan 19, 2022
    Replies:
    10
    Views:
    4,054
    DogCavalry
    Jan 31, 2022
  6. cmaas

    Electric hydrofoil prop

    cmaas, Sep 8, 2020 ... 2 3 4
    Replies:
    53
    Views:
    13,310
    johneck
    Jan 6, 2022
  7. Slowboating

    Outboard prop modifications

    Slowboating, Oct 22, 2021 ... 2 3
    Replies:
    39
    Views:
    8,193
    johneck
    Nov 30, 2021
  8. sdowney717

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

    sdowney717, Aug 15, 2021
    Replies:
    7
    Views:
    2,594
    johneck
    Sep 8, 2021
  9. DogCavalry

    A Picture is Worth a Thousand Words

    DogCavalry, Jun 30, 2021 ... 2 3
    Replies:
    31
    Views:
    6,836
    powerabout
    Aug 31, 2021
  10. jake wilson

    how to find the angle of entrance

    jake wilson, Aug 24, 2021
    Replies:
    1
    Views:
    2,292
    TANSL
    Aug 24, 2021
  11. scopx

    redoing vintage 23' pontoon and propulsion choices

    scopx, Jul 19, 2021
    Replies:
    3
    Views:
    2,076
    bajansailor
    Jul 23, 2021
  12. Christopher Dodigovic

    Is this set up even possible to run?

    Christopher Dodigovic, Jun 23, 2021
    Replies:
    2
    Views:
    2,044
    Mr Efficiency
    Jun 23, 2021
  13. rfleet1066

    Correct prop size and speed

    rfleet1066, May 7, 2021 ... 2
    Replies:
    20
    Views:
    6,448
    rfleet1066
    May 12, 2021
  14. SwedenYachtsDaniel

    Prop size help

    SwedenYachtsDaniel, May 6, 2021
    Replies:
    12
    Views:
    5,147
    SwedenYachtsDaniel
    May 9, 2021
  15. enmico

    gearbox ratio calculation

    enmico, Apr 10, 2013 ... 2
    Replies:
    18
    Views:
    19,606
    Adler
    May 7, 2021
  16. Nicholas Castro

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

    Nicholas Castro, May 3, 2021
    Replies:
    8
    Views:
    13,032
    DogCavalry
    May 6, 2021
  17. Callum Stark

    Kort Nozzle Diameter (19A + Kaplan)

    Callum Stark, Apr 29, 2021
    Replies:
    5
    Views:
    4,914
    comfisherman
    May 1, 2021
  18. Roberto Certain

    Need help gear ratio

    Roberto Certain, Apr 24, 2021 ... 2
    Replies:
    16
    Views:
    6,469
    missinginaction
    Apr 26, 2021
  19. KenSmithFishing

    New video on prop selection

    KenSmithFishing, Apr 24, 2021
    Replies:
    0
    Views:
    2,236
    KenSmithFishing
    Apr 24, 2021
  20. BertKu

    A strange question

    BertKu, Dec 29, 2020 ... 2 3
    Replies:
    38
    Views:
    8,223
    gonzo
    Mar 23, 2021
  21. Chris Drake

    Expert seeking expert to bounce prop design ideas off

    Chris Drake, Jun 12, 2020 ... 2
    Replies:
    20
    Views:
    6,232
    gonzo
    Mar 7, 2021
  22. Astrocat505

    Gear ratio for pedal drive

    Astrocat505, Feb 18, 2021
    Replies:
    11
    Views:
    5,971
    Tiny Turnip
    Feb 24, 2021
  23. Ron Mintle

    Prop for Electric Motor

    Ron Mintle, Feb 13, 2021
    Replies:
    3
    Views:
    3,027
    jehardiman
    Feb 14, 2021
  24. DogCavalry

    Oversized prop compromise

    DogCavalry, Sep 24, 2020 ... 2 3 4
    Replies:
    54
    Views:
    13,643
    DogCavalry
    Feb 12, 2021
  25. DogCavalry

    Propulsive Efficiency related to hub diameter

    DogCavalry, Feb 11, 2021
    Replies:
    12
    Views:
    4,635
    DogCavalry
    Feb 12, 2021
  26. jtpmail

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

    jtpmail, Oct 6, 2018
    Replies:
    13
    Views:
    8,989
    DogCavalry
    Feb 11, 2021
  27. tonipu

    Propulsion for New boat

    tonipu, Jan 20, 2021 ... 2
    Replies:
    20
    Views:
    4,142
    tonipu
    Feb 8, 2021
  28. ldigas

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

    ldigas, Jan 22, 2021
    Replies:
    4
    Views:
    2,680
    Mr Efficiency
    Jan 22, 2021
  29. ric243

    Prop Questions

    ric243, Dec 30, 2020
    Replies:
    7
    Views:
    3,144
    missinginaction
    Jan 12, 2021
  30. Daan

    Left handed propeller

    Daan, Sep 20, 2020 ... 2 3
    Replies:
    34
    Views:
    8,646
    brendan gardam
    Dec 5, 2020
  31. chipresistor122

    Need prop recommendation for 20 CC Seacraft

    chipresistor122, Dec 2, 2020
    Replies:
    4
    Views:
    2,829
    missinginaction
    Dec 2, 2020
  32. 7228sedan

    Calulated propeller efficiency

    7228sedan, Nov 5, 2018 ... 2 3
    Replies:
    34
    Views:
    10,642
    7228sedan
    Nov 28, 2020
  33. Walid

    engine-propeller matching

    Walid, Oct 21, 2020
    Replies:
    2
    Views:
    4,645
    Walid
    Oct 22, 2020
  34. kleenbreeze

    I need to find a propeller vendor in the EU

    kleenbreeze, Oct 13, 2020
    Replies:
    2
    Views:
    2,302
    kleenbreeze
    Oct 14, 2020
  35. Solarboat

    Determine pitch along the length

    Solarboat, Jun 22, 2020
    Replies:
    11
    Views:
    4,869
    BlueBell
    Aug 30, 2020
  36. Cajunpockettunnel

    Best prop for pocket tunnel

    Cajunpockettunnel, Aug 23, 2020 ... 2 3
    Replies:
    37
    Views:
    10,330
    Cajunpockettunnel
    Aug 29, 2020
  37. Jason

    DIY Prop

    Jason, Apr 6, 2020
    Replies:
    3
    Views:
    2,999
    jehardiman
    Jul 31, 2020
  38. Solarboat

    How to get the MWR

    Solarboat, Jun 20, 2020
    Replies:
    5
    Views:
    3,832
    jehardiman
    Jun 23, 2020
  39. Luizsbk

    Design Tug Boat propulsion system

    Luizsbk, Jun 21, 2020
    Replies:
    2
    Views:
    2,829
    Luizsbk
    Jun 22, 2020
  40. Solarboat

    Bp-delta Diagram

    Solarboat, Jun 18, 2020
    Replies:
    7
    Views:
    4,881
    Solarboat
    Jun 20, 2020
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