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Factor of safety for rotary blades

  1. Sep 26, 2013 #1
    anybody here who knows the factor of safety for rotating blades? ASAP. thanks!
     
  2. jcsd
  3. Sep 28, 2013 #2

    SteamKing

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    What kind of rotating blades? A helicopter? The propeller on a ship or an airplane? The blades in a blender or a cake mixer?
     
  4. Sep 29, 2013 #3

    AlephZero

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    Preferably, greater than 1.

    But a simple idea like "factor of safety" isn't very useful for "high tech" rotating machines. It's more about doing a risk analysis of the consequences of failure, and designing the machine to mitigate those consequences.

    As a simple example, if a helicopter rotor blade tries to pick a fight with a large bird (e.g. a swan) with mass say 8 pounds, the blade will lose every time. The "factor of safety" comes from not picking the fight, not from design of the blade.
     
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