hull interactions efficiency

Discussion in 'Props' started by ikh_one86, Aug 23, 2010.

  1. ikh_one86
    Joined: Aug 2010
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    Location: malaysia

    ikh_one86 New Member

    i would like to ask, does any one know what is the value for hull efficiency for high seed vessel? i would like to predicted in order to design propulsion system for high speed vessel.
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    For a high speed vessel, it should be just under 1 if you arranged the hull and propeller right.

    eta(h) = (1-t)/(1-w) in Taylor notation where t is the thrust deduction factor and w is the wake fraction. Unlike a moderate speed vessel which can have eta(h) over 1.0, a high speed (semi-planing) vessel will have t larger than w so will always be less than 1.0.
     
  3. ikh_one86
    Joined: Aug 2010
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    ikh_one86 New Member

    thanks jehardimen.. anothe question is, where can i have Wageningen which cover for 5 blade of propeller.
     

  4. Olav
    Joined: Dec 2003
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    Olav naval architect

    Wageningen B-Series Open Water Curves

    ihk_one86,

    you might want to check this out: Wageningen B-Series Propeller Charts

    This PDF contains curves plotting KT, KQ, and η0 as a function of J as well as the polynomials derived from tank measurements to express the open water characteristics of Wageningen propellers with 2 to 7 blades and various P/D.

    Hope this helps.

    Edit: There's also a publication by Peter van Oossanen and M. W. C. Oosterveld: Further Computer Analysed Data of the Wageningen B-Screw Series from 1975.
     
    Last edited: Aug 24, 2010
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