Hrant said:
... Appreciate input from those who really know what the underlying dynamics are for open face helmet recoomendation with air bags. TIA.
Well, I'm not speculating or making assumptions.
As a certified HANS technician, I've had days of training on helmets, cockpit safety, and head and neck restraints (all of them, not just HANS). I've studied the results of bio-mechanical testing on crash-test dummies, and numerous de-briefs from on track incidents. Anyone can feel free to adopt or ignore these findings, but don't assume that they're not valid. Go ahead and spend hours doing online research, or just save yourself the time and review this summary.
Air bags are compliant and fully crushable, the interior of your helmet will crush only slightly. The risk of injury in that scenario is that your face may strike the interior of the helmet, not that the helmet would fail. This does emphasize the critical importance of proper fit. Unfortunately, the ideal, safest fit is rarely available in $200 helmets. One must spend big money for the real deal (Sparco, Arai, Bieffe, Stand 21, Schuberth) That being said, helmet fit is certainly a very important consideration.
The absolute safest possible cockpit configuration is a full-cage, fixed race seat, 6 point harnesses, full face helmet, and HANS device, and no air bag. But, that's not practical for many enthusiasts that track thier high-performance street cars.
So, simply weigh out what your own cockpit is like, and what your safety equipment is, and do your own due diligence. The above is some useful information for those that are interested.