Designing a propeller using Gawn Standard Series propeller (URGENT)

Discussion in 'Props' started by Gman999, Jan 22, 2019.

  1. Gman999
    Joined: Jan 2019
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    Location: Lonon

    Gman999 New Member

    Hi all,

    I am designing a propeller based on the Gawn Series and I cannot find the Gawn Kt-Kq chart for a BAR of 0.2. Does anyone know where I can obtain this chart? I would really appreciate it as I have searched everywhere online.

    Kind regards,

    Tariq
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    There may not be one. The Gawn series was specifically for wide bladed propellers to lower blade loading to prevent onset of cavitation.
     
  3. Gman999
    Joined: Jan 2019
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    Location: Lonon

    Gman999 New Member

    Thank you for the reply but the Gawn propeller series have a BAR of 0.20-1.10, so there must be a chart for a BAR 0.2. Do you know where I can find it? I would really appreciate it as I need it quite urgently.
     

  4. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    FWIW, I've never seen a Gawn prop under a DAR of 0.5. A BAR of 0.2 would basically be the same as a Wageningen B with a BAR of 0.2 as that was the starting base (note the BAR, DAR and EAR are all different for the same prop). Since it was a 1952 RINA project, I would go look there in the original paper.

    Edit to add...the papers are in Trans. RINA 1953 and 1957.
    http://www.rina.org.uk/hres/1993-1 Hope KJ - Aspects of Modern Propeller Design.pdf
     
    Last edited: Jan 25, 2019
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