Re: Neck Safety Device Comparison
Also, in case anyone is curious, here's a link to the full 38.1 spec description:
http://www.sfifoundation.com/Spec_38.1_092311.pdf
A lot of it reads like silly legalese to me, but some things jump out:
Reaction Linkage: The means by which the head force necessary to limit
displacement of the head with respect to the torso is reacted. Acceptable
reaction linkages could include load paths to the torso or to the restraint
webbing. Direct attachment to react loads to a fixed point or points on a
vehicle structure or restraint webbing will not be acceptable because of the
potential for torso displacements with respect to these points. Imposed
loading by the reaction linkage to other areas of the body should be applied
using approaches demonstrated to be practical without imposing risk of
serious injury.
I'm guessing that's the specific part that keeps the Isaac system from being certified.
It also goes into detail about the flame tests the devices go through. Good info.