Bp-delta Diagram

Discussion in 'Props' started by Solarboat, Jun 18, 2020.

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  1. Solarboat
    Joined: Apr 2020
    Posts: 16
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    Location: Netherlands

    Solarboat Junior Member

    hello

    I am using the book of Dave Gerr to calculate a prop. But it is hard to read the diagram because i have a low Bp value (4,613). it's hard to read the correct number. i think it is 90 but i cant read the efficiency number and the pitch ratio number.

    Is there a better quality diagram or something to read the correct numbers?

    thanks
     
    Solarboat, Jun 18, 2020
    #1
  2. jehardiman
    Joined: Aug 2004
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    jehardiman Senior Member

    What prop? I have full size ones for the standard B series.
     
    jehardiman, Jun 19, 2020
    #2
  3. Solarboat
    Joined: Apr 2020
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    Solarboat Junior Member

    Yes, i have a standard B serie.
     
    Solarboat, Jun 19, 2020
    #3
  4. jehardiman
    Joined: Aug 2004
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    jehardiman Senior Member

    Which one....B 2.38, B3.50...?
     
    jehardiman, Jun 19, 2020
    #4
  5. Solarboat
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    Solarboat Junior Member

    B3.50
     
    Solarboat, Jun 19, 2020
    #5
  6. jehardiman
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    jehardiman Senior Member

    jehardiman, Jun 19, 2020
    #6
    TANSL and missinginaction like this.
  7. baeckmo
    Joined: Jun 2009
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    baeckmo Hydrodynamics

    Thanks for this reference jhm, most appreciated!
     
    baeckmo, Jun 20, 2020
    #7

  9. Solarboat
    Joined: Apr 2020
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    Solarboat Junior Member

    Thanks!
     
    Solarboat, Jun 20, 2020
    #8
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