pitch, rpm, diameter

Discussion in 'Props' started by sinus, Aug 12, 2012.

  1. sinus
    Joined: Feb 2008
    Posts: 38
    Likes: 1, Points: 0, Legacy Rep: 25
    Location: slovenia

    sinus Junior Member

    Hello;



    Any empiric or exact datas how impact rpm, diameter and pitch of propeller on hole shot.



    Example with two propellers with same caracteristics, but diferent input:

    a.) shaft rpm = 3.700 min-1
    prop diameter = 15,25"
    pitch = 21"

    b.) shaft rpm = 3.300 min-1
    prop diameter = 15,25"
    pitch = 26"

    Will be same resultat at hole shot by both situations or?
    If will be the same situation and we want to keep pitch, prop caracteristics and rpm what to change:
    - prop diameter
    - tighten prop blades at tips


    Which prop type with same diameter and pitch it is less hard for engine at hole shot:
    - choper style
    - clever style
    - semy clever style
    - Hydromotive 5P
    - Hydromotive 5PX
    - Bravo 1
    - Maximus lab and diameter 15,25"




    bye
    Saso
     
  2. hoytedow
    Joined: Sep 2009
    Posts: 5,804
    Likes: 369, Points: 93, Legacy Rep: 2489
    Location: North of Cuba

    hoytedow Carbon Based Life Form

    I am not sure what you mean by "hole shot", but the one with the lower pitch will have more thrust(more power and less speed) at the same rpm than the same style prop with the higher pitch.
     
  3. sinus
    Joined: Feb 2008
    Posts: 38
    Likes: 1, Points: 0, Legacy Rep: 25
    Location: slovenia

    sinus Junior Member

    Holoe shot= come out to plane.


    bye
    Saso
     

  4. hoytedow
    Joined: Sep 2009
    Posts: 5,804
    Likes: 369, Points: 93, Legacy Rep: 2489
    Location: North of Cuba

    hoytedow Carbon Based Life Form

    The lower pitch will give you the power to get on plane sooner but will have a lower top speed.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.