Props

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

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  1. apex1
    Locked

    The Controllable Pitch Propeller, a summary.

    apex1, Dec 26, 2009 ... 13 14 15
    Replies:
    222
    Views:
    79,477
    TeddyDiver
    Oct 12, 2012
  2. takoateli

    Prop Thrust Calculation

    takoateli, May 31, 2011 ... 2
    Replies:
    25
    Views:
    73,626
    Mick@itc
    Apr 8, 2012
  3. 67-LS1

    Prop size calculator

    67-LS1, Jul 22, 2004
    Replies:
    13
    Views:
    71,373
    yipster
    Mar 5, 2005
  4. Tiny Turnip

    Propellor for pedal powered catamaran

    Tiny Turnip, Mar 31, 2008 ... 2 3
    Replies:
    41
    Views:
    57,804
    jit89
    Jun 17, 2019
  5. batboat

    Propeller Speed Theory

    batboat, Sep 25, 2005
    Replies:
    9
    Views:
    50,923
    mydauphin
    May 23, 2009
  6. missinginaction

    The mystery of a proper prop and terrible performance

    missinginaction, Jan 25, 2020 ... 11 12 13
    Replies:
    188
    Views:
    45,366
    sdowney717
    Jul 22, 2025
  7. Diamond Cutter

    Is there a simple relationship between prop rpm and boat speed?

    Diamond Cutter, Jan 12, 2012 ... 2
    Replies:
    18
    Views:
    35,256
    johneck
    Feb 24, 2012
  8. mcl

    Propeller testing and reviews mercury vs solas

    mcl, Sep 7, 2018
    Replies:
    0
    Views:
    34,923
    mcl
    Sep 7, 2018
  9. tom kane

    How do propellers propell a boat.

    tom kane, Mar 12, 2015 ... 7 8 9
    Replies:
    126
    Views:
    28,289
    jehardiman
    Apr 27, 2015
  10. jav

    Inboard Propeller sizing / theory ??

    jav, Nov 8, 2004 ... 2
    Replies:
    22
    Views:
    26,378
    Richard Petersen
    Dec 10, 2004
  11. Sindel

    Shaft material opinions?

    Sindel, Aug 14, 2009 ... 2 3
    Replies:
    38
    Views:
    26,048
    Yellowjacket
    Aug 21, 2009
  12. Asleep Helmsman

    Power Required

    Asleep Helmsman, Jan 5, 2010 ... 7 8 9
    Replies:
    133
    Views:
    25,354
    Joakim
    Feb 28, 2010
  13. DennisRB

    Variable pitch props. Worth it on small boat?

    DennisRB, Nov 30, 2010 ... 2
    Replies:
    17
    Views:
    24,438
    TeddyDiver
    Dec 5, 2010
  14. stratus5

    Diameter Vs Rpm for the new guy

    stratus5, Sep 17, 2005
    Replies:
    8
    Views:
    23,857
    Jango
    Sep 28, 2005
  15. RayThackeray

    Prop calculators - is there a difference between electric and diesel drives?

    RayThackeray, Nov 14, 2011 ... 5 6 7
    Replies:
    91
    Views:
    23,007
    tugboat
    Mar 10, 2012
  16. amaurer

    trolling motor prop rpm?

    amaurer, Sep 27, 2009
    Replies:
    1
    Views:
    21,870
    portacruise
    Sep 28, 2009
  17. michaeljc

    Prop tip velocity

    michaeljc, Jun 10, 2013 ... 3 4 5
    Replies:
    62
    Views:
    21,721
    gonzo
    Jun 23, 2013
  18. joeforte

    Trolling motor powered surfboard: prop problems

    joeforte, Jul 23, 2007 ... 2
    Replies:
    25
    Views:
    21,703
    penguin78
    Apr 16, 2010
  19. daiquiri

    Propeller performance vs. shaft inclination

    daiquiri, Dec 9, 2009
    Replies:
    10
    Views:
    21,549
    philSweet
    Jun 12, 2012
  20. Spyderz

    Wageningen B-Series BP-Delta Diagrams Request

    Spyderz, Apr 6, 2011
    Replies:
    12
    Views:
    21,455
    plr
    Apr 30, 2024
  21. Sindel

    a prop's rake

    Sindel, Aug 7, 2009 ... 4 5 6
    Replies:
    75
    Views:
    21,199
    Sindel
    Aug 17, 2009
  22. solarguy

    High pitch trolling motor prop for solar boat

    solarguy, Oct 29, 2014 ... 2 3
    Replies:
    34
    Views:
    21,061
    solarguy
    Oct 31, 2014
  23. Duco84

    Propeller size

    Duco84, May 26, 2015 ... 3 4 5
    Replies:
    70
    Views:
    20,555
    Duco84
    Aug 7, 2015
  24. zzerachiel

    B-Wageningen propeller diagrams

    zzerachiel, Jun 1, 2010 ... 2
    Replies:
    21
    Views:
    20,399
    pavel915
    Jun 9, 2010
  25. kengrome

    Controllable pitch propellers for small boats ...

    kengrome, Jun 8, 2007 ... 2
    Replies:
    17
    Views:
    20,387
    thudpucker
    Sep 19, 2007
  26. BertKu

    Turning Clock or anti clock wise

    BertKu, Dec 28, 2012 ... 4 5 6
    Replies:
    78
    Views:
    20,385
    BertKu
    Mar 4, 2013
  27. bblagonic

    prop doing bad

    bblagonic, Oct 24, 2009 ... 3 4 5
    Replies:
    62
    Views:
    20,302
    Joakim
    Jan 27, 2010
  28. DennisRB

    Underwater thread sealant?

    DennisRB, Apr 23, 2013 ... 2
    Replies:
    15
    Views:
    20,127
    CDK
    Apr 24, 2013
  29. terhohalme

    Dimensions of trolling motor prop

    terhohalme, Mar 18, 2017 ... 2
    Replies:
    16
    Views:
    20,089
    terhohalme
    Mar 24, 2017
  30. gyrojocky

    Surface Piercing Props

    gyrojocky, Sep 30, 2004 ... 2
    Replies:
    22
    Views:
    19,395
    tom kane
    Dec 10, 2004
  31. enmico

    gearbox ratio calculation

    enmico, Apr 10, 2013 ... 2
    Replies:
    18
    Views:
    19,255
    Adler
    May 7, 2021
  32. kistinie

    Controllable Pitch Propeller for lower power & electric motors

    kistinie, Jan 2, 2010 ... 2 3
    Replies:
    41
    Views:
    18,652
    powerabout
    Jul 9, 2010
  33. abohamza

    propeller rotation

    abohamza, Oct 18, 2011
    Replies:
    14
    Views:
    18,295
    abohamza
    Oct 19, 2011
  34. Kvicken

    Diffuser ring experiment

    Kvicken, Oct 6, 2011 ... 2
    Replies:
    22
    Views:
    17,979
    Kvicken
    Oct 18, 2011
  35. TrustedShips

    Adding Kort nozzle to an existing propeller

    TrustedShips, Feb 6, 2012 ... 2
    Replies:
    16
    Views:
    17,941
    TrustedShips
    Feb 11, 2012
  36. Michelle Elliott

    3 blade propeller vs 4 blade propeller

    Michelle Elliott, Jun 27, 2019
    Replies:
    12
    Views:
    17,778
    Mr Efficiency
    Jul 1, 2019
  37. Per S

    Speed/slip problem

    Per S, Jan 4, 2005 ... 2 3
    Replies:
    43
    Views:
    17,382
    ljwhisenant
    Jul 17, 2005
  38. Laranjo123

    Bp series propeller chart

    Laranjo123, Oct 21, 2011 ... 2
    Replies:
    15
    Views:
    17,088
    DCockey
    Dec 19, 2011
  39. sailor0000

    Propeller calculations - HELP!

    sailor0000, Dec 27, 2012 ... 2 3 4
    Replies:
    48
    Views:
    17,037
    JSL
    Jan 11, 2013
  40. sottorf

    Strange Propeller

    sottorf, Sep 17, 2012 ... 2 3
    Replies:
    39
    Views:
    16,948
    Leo Lazauskas
    Dec 11, 2014
Showing threads 1 to 40 of 544

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