Propeller Design for Ka4-70

Discussion in 'Props' started by ascial, Jul 9, 2022.

  1. ascial
    Joined: Feb 2022
    Posts: 6
    Likes: 0, Points: 1
    Location: Sweden

    ascial Junior Member

    Hey everyone!
    I have a question about creating Ka4-70 profile:

    I am using OpenProp to create Ka4-70 profiles but I dont understand how I can calculate some data.
    For example; I need c/D and t0/D ratios but I did not find anywhere. Could you please share me these datas?
    I found Ka4-70 datasheet but I dont know how I can calculate. I am adding this datasheet.

    Thanks in advance.
     

    Attached Files:

    • a.PNG
      a.PNG
      File size:
      86.1 KB
      Views:
      45
  2. jehardiman
    Joined: Aug 2004
    Posts: 3,359
    Likes: 774, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    What is "c" in your post? The cord?
    What is t(zero)?
    As far as I read the prop chart, everything is there. Perhaps you need to go review the concepts; instead of just looking for it spelled out for you.
     
  3. ascial
    Joined: Feb 2022
    Posts: 6
    Likes: 0, Points: 1
    Location: Sweden

    ascial Junior Member

    @jehardiman

    c is chord lenght, c/D is chord to diameter ratio at XR
    t0 is thickness, t0/D is thickness / diameter at XR
     

  4. baeckmo
    Joined: Jun 2009
    Posts: 1,413
    Likes: 395, Points: 83, Legacy Rep: 1165
    Location: Sweden

    baeckmo Hydrodynamics

    As JHM said, it's all there, but it may be a lingo problem; the "chord" is not tabulated as such, but it mentions "section length". Now study the document carefully and make a handsketch of a section, say the 60% radius, calculating the ordinate values manually and plot likewise. Software is useful only if you understand the basics!
     
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.