"Impromptu nailed pole testing on Riselaw Road"

• Richard Healey

  25 August 2019

  
  

  Bit of impromptu nailed pole testing on Riselaw Road just now.
  Well done Aurora, Richard Fletcher and Glen Coates. Looks like nailing a poor condition pole means that it snaps a metre higher than usual as well as at ground line. Strangely enough reduced fibre strength doesn't stop at the ground.
  Cocks.

  
  
  

  Comments

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    Mark Jefferies Well - the nails did stop the car in an efficient manner by the look of it - so credit where credit is due Richard 🙂

    2
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  Wayne Pennington It would appear they may created a stress point the same as when you put a cut in a piece of wood and break it

   
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  Richard Healey 

  Wayne Pennington yes. A well documented failure of reinforcing systems. Often referred to as a barber's chair failure although here the more typical bit of timber left sticking upright isn't present.
  
  That strap makes a very efficient stress raiser. It acts in precisely the same way as a notch in the pole would, concentrating stress at one point until failures occurs.