Tuesday, March 12, 2013

Ok - maybe just maybe...

(Images: Gif Bin) moments like these, Big Helma could play a role!!!


  1. What was the impact speed?

    1. ...looks slowish!

      - whilst the impact itself is definitely linear, wouldn't you say?!

  2. Maybe not.
    It looks like the head snaps backwards fairly sharply. This is rotation in the sagittal plane. Here is a report on efforts to produce this sort of rotation in some unfortunate lab animals.
    The helmet looks to be well fitted and fastened, as required, and does not move on the head. Consequently, all available friction between the sign and the helmet is converted into rotation of the head.
    The increased size of the head due to the helmet also gives greater leverage around the pivot point of the neck to help overcome muscle resistance.
    Consider the same without the helmet. Friction between the sign and your hair begins to slide the scalp across the skull. When the scalp reaches its' limit of movement it will tear. There is likely to be much less rotation of the head.
    I would say the helmet leads to a greater chance of an unconscious victim with some degree of brain injury but no scalp wound rather than a victim with a messy scalp injury but no brain injury.

  3. I realise that it's not fair to pick on bicycle helmets in a joke video. They would have to be far more effective in real life situations. Take something simple and really obvious. A bicycle helmet will protect you from swooping magpies. If it saves one child...
    Here's proof.
    I see your method in the second one Sue.

    1. Ha! ha! ha! - I love the curly wig bit of the experiment, Steve! - that's me to a tee and it's exactly why they never attack me - they hate my husband though and notwithstanding him observing me pass through 'Magpie Country' unharmed & unbothered 100s of times, he still resolutely refuses to take off his helmet at that point in our journey!!!!!