Propeller weight distribution

Discussion in 'Diesel Engines' started by twakeley, Feb 3, 2009.

  1. twakeley
    Joined: Mar 2006
    Posts: 30
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    Location: New Orleans, LA

    twakeley NAME Student

    All,

    I'm trying to resolve some forces due to the loss of a propeller blade. I have the total weight but am unsure of the weight of each blade. Is there a general rule of thumb for weight distribution between the blades and hub of a propeller? Does the proportion change due to the size of the prop? I'm thinking 40% hub and 60% blades as a starting point.. ideas?

    Trevor
     
  2. Olav
    Joined: Dec 2003
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    Location: Filia pulchra Lubecæ

    Olav arch. nav.

    I don't know of any rule of thumb but it should be fairly easy to determine the weight of the hub by measuring/calculating its volume and multiplying it with the material density. The difference between the total weight and that of the hub then logically is the weight of the blades.

    The proportion between hub and blade weight is constant unless there is a non-linearity between prop diameter and hub size, i.e. a bigger propeller may get away with a proportionally smaller hub than one with lower dia.
     
  3. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Think of Archimedes and you'll figure out how to calculate a single blade weight. ;)
     
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