It seems I only get to Blackrock once or twice a decade, so obviously I only get to learn about Balls 18 from the interwires and youtubes. One really cool project from last year was "Locomotive Breath." Does anyone have stats on this rocket or simulation details? It looks like either a P or a Q. The acceleration in the video below is really remarkable for such a large rocket - and helped cause the failure by bringing on high mach numbers in thick air. The page and video claim that a weak fin may have cause the shred. I wonder if airframe stress could also be to blame, perhaps the joint between the payload and motor? It may be hard to decide if fin damage is a cause or symptom of a shred condition.
Despite the failure, this was a really nice rocket. It would be great to see them try again. And perhaps next time stage it to a slow N motor!