Like Virgil said... If its cutting through 5- 5/8" studs like butter, what kind of tether is going to keep it on the car with that much energy being exerted tearing it off the car?
And why would the tether need to keep the wheel attached to the hub? Once the wheel studs are sheared the drivetrain is no longer imparting torque to the wheel. All that the tether needs to do is keep the wheel from leaving the wreckage. Anyone familiar with fall protection safety gear can show you a bundled shock absorbing lanyard that plays out during a fall to protect the wearer from a sudden fall arrest injury. You can do something similar with a tether folding and binding it three ply inside the live axle tube. If in the event the wheel leaves the hub the tether can play out 3 or 4 feet and at least keep the tire/wheel going in the same direction the wreckage is. There are families of material available that are in fact stronger than steel
ETA, and as far as the video taken by a spectator, Really, The families don't need to see that. There is really nothing served by broadcasting gore over the internet. You agree to that when you buy your ticket. Read the stub, Just be thankful NHRA doesn't enforce its rights all the time.
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