Quote:
A lot is written here and on Isaac's web site about single point of release being the reason for its not meeting SFI requirements. However, that is not the only reason. Another more serious issue, from SFI 38.1:
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.
With Isaac, the critical case would be a side impact, or multiple impact (roll/endo), where harness slips off the shoulder and pulls the driver's head sideways, potentially causing injury where none would have occured otherwise. Hans, Hutchens and R3 are all attached to the torso, and don't have that problem.
-Juan
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