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The jarring crash involving Christopher Bell on Lap 148 of the NASCAR Cup Series race at Michigan International Speedway has been confirmed as the most severe impact recorded since the introduction of the Next Gen car in 2022. Furthermore, data analysis suggests this incident represents the hardest recorded impact in at least a decade, according to NASCAR’s internal safety metrics.
The critical moment unfolded in Turn 3 when Chase Elliott, while battling for second position, lost traction over a track bump. This loss of control resulted in Elliott sliding up into Bell’s No. 20 Joe Gibbs Racing Toyota. The initial contact sent Bell spinning hard into the SAFER Barrier, necessitating a 21-minute repair to the protective system. The incident was compounded by a secondary impact as Elliott’s car slid back down the track, making contact with the left side of Bell’s vehicle.
Details of the incident’s severity were revealed on the latest episode of the official NASCAR Hauler Talk podcast. Mike Forde, a communications executive for NASCAR, stated that while the Next Gen car has been in use for just over four years, Bell’s crash registered the highest impact measurement since its debut. More significantly, this impact surpassed any recorded data collected by Matt Harper, NASCAR’s managing director of safety systems, since he joined the organization in 2015 and began employing his current data collection methodologies.
The metric used to quantify the severity of Bell’s crash is Delta-v, a measure of velocity change. Forde elaborated on its significance: "Delta-v is the measure of speed lost in an incident. So if you’re going 200 mph and then all of a sudden you come to a stop because you hit a wall and scrub off X amount of speed, that difference is what the Delta-v is." While Forde declined to disclose the specific Delta-v number for Bell’s incident, citing its proprietary nature and that it is shared directly with the team and driver, he confirmed it was the largest recorded in the Next Gen era.
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To provide further context on impact measurement, Forde engaged John Patalak, Vice President of Safety Engineering, and Matt Harper to differentiate Delta-v from G-force measurements, another common indicator of impact severity.
Patalak explained the complexities: "Well, it’s complicated, but… a G is a unit of acceleration. You’re better talking about acceleration than G. Acceleration is how fast the velocity of something changes. You can come off a stop sign on I-85 in five seconds and have a peak of five G and a Delta-v, which is a change of velocity, of 60 miles per hour. Or, you can hit a wall and go from 60 to 0 in .1 second and a peak at 50 G. The Delta-v is the same. Both measures matter. The reason acceleration matters is mass x acceleration equals force."
Harper added crucial nuance regarding peak G-force: "We also usually call out the peak G. That is not a constant load through the crash, just the highest value. Which is also important because if you talk about peak G, that number may seem massive, but when you’re talking about injury potential, it’s the length of time you are at a high G level."
Patalak further clarified the interrelation: "You could also have a really large peak G but without a descent Delta-v, it isn’t injurious or interesting." This highlights that while peak forces are significant, the overall change in velocity over time is a critical factor in assessing the potential for injury.
NASCAR has shared the specific G-force and Delta-v data from Bell’s crash with Joe Gibbs Racing (JGR), the team Bell represents. The decision on whether to release this proprietary data to the public rests with JGR and Bell himself. In the immediate aftermath of the incident, NASCAR conducted a thorough safety review, including an inspection of the car and the damaged SAFER Barrier before its repair. A more comprehensive safety review of Bell’s car was conducted at the JGR shop on Monday morning by Matt Harper.
Despite the significant impact, Bell sustained a fracture in his left wrist and undisclosed ankle injuries. However, he has received medical clearance to compete in the upcoming NASCAR Cup Series event at Pocono Raceway. Forde detailed the clearance process: "He needed to have a follow-up visit with his physicians. Once we got the clearance from them, we would then clear him to race… and he has received that clearance. … How that works is Christopher will see his personal physicians, that physician will work with our medical team to clear him so that clearance does come from his doctors and they have to be board certified, so on and so forth, the right credentials. They work with us and say ‘we examined him and we feel comfortable he can be in the race car’ and once we get the clearance from them, we give him the clearance."
During the safety review at JGR, a particular focus was placed on the head surround foam within Bell’s car. Forde noted: "A big priority is being put around the head surround foam. We keep updating this part of the rule book as we learn more and more. The thickness of the head surround is so important. And because we were pleased with how the head surround supported Christopher in this incident, we did a lot of measurements of the type of foam he used, the softness and the thickness. We want to see, ‘Hey, is this sort of the magic number? Is this something that other drivers may want to look at? Because this was the biggest hit we’ve ever seen in the Next Gen era, and by and large, Christopher came out of it pretty well. So that’s one of the things we’ll be studying as we move forward." This suggests that the current specifications and implementation of the head surround foam may have played a crucial role in mitigating more severe injuries for Bell.
Chase Brashears, NASCAR Director of Track Services, also participated in the podcast, offering insights into the immediate safety protocols implemented following the crash.
The incident at Michigan underscores NASCAR’s ongoing commitment to driver safety and the continuous evolution of its safety systems. The detailed analysis of Bell’s crash, utilizing advanced metrics like Delta-v, provides valuable data for refining car design, track safety features, and driver protection equipment. While Bell faces a recovery period for his injuries, his clearance to race indicates the effectiveness of the safety measures in place and the rigorous medical protocols followed by the sanctioning body. The study of the head surround foam further highlights NASCAR’s proactive approach to understanding and enhancing driver protection in the face of increasingly high-speed racing.
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