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Originally Posted by Dave Brand
NO!!!! Ideally the helmet shell should show no deformation: the internal layers of the helmet should absorb the impact. That helmet did its job, but only just.
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How could the internal layers absorb the impact without the outside deforming first? Too much rigidity in the helmet would transfer the forces which could result in a broken neck.
We don't know how the internal layers have deformed anyway but I would think the deformation would be progressive as the driver wasn't injured too severely.