VOZZ Helmets

[NAKID]

I recall a helmet manufacturer stating that the conventional chinstrap systems have a pull strength less than what's necessary to pull your head off.

What's the deal regarding that for this lid?

"less than what's necessary to pull your head off" seems pretty subjective. I imagine that could vary greatly depending on the size and build of the individual.

[stopintime]

I recall a helmet manufacturer stating that the conventional chinstrap systems have a pull strength less than what's necessary to pull your head off.

What's the deal regarding that for this lid?

The ECE document says
7.10.5. The strap shall withstand a tension of 3 kN without breaking.
Most helmet straps can probably take heavier loads. I don't know how that compares to neck strength.

I've edited my previous comment about a mandatory strap, but I still wonder how the Vozz retention system can qualify.

[Speeddog]

I can't link to the source of what I stated, but I recall it from shortly after Simoncelli's death.
Folks were saying his helmet should have stayed on.

USDOT helmet requirements:
www.nhtsa.gov/staticfiles/nvs/pdf/TP-218-07.pdf
Chinstrap test is Section 12.8.

TL;DR summary is the strap must withstand a 136 kilo load for 120 seconds, and must not stretch more than 2.5 cm.

That's 1334 N.

Some Googling unearthed this:

http://www.ncbi.nlm.nih.gov/pubmed/19388771
Citing 12 cadaver tests, mean failure load was 3100+/-645 N.
As that was a summary, description of 'failure' was not available.

http://deathpenalty-trial.jp/wordpress/wp-content/uploads/2011/09/Rabl_kaitousho1_eng.pdf
Cites a value of 12000 N.