I ain't volunteering to be a crash dummy for that test. I may have a better idea on the 'rattle' effect next Saturday. Will report my findings after the ride in a Cup car.
I know it's not a real 'test' or comparison but the other day, in telling a youngun about the mahogany ships offloading here in the port years ago, I thought about the impact concussion that had a lot of fish and other marine life floating even before the log floated back to the surface. When the cranes let a log drop, you could 'feel' it from the pier. Not a lot, but if you were in the water, you would have been floating and not responsive for a while. The shock wave from a real 'blast' might have been a bit more than it was thought to be back then.